1
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Fukui T, Nishimura T, Miyata Y, Ueno K, Taniguchi T, Watanabe K, Nagashio K. Single-Gate MoS 2 Tunnel FET with a Thickness-Modulated Homojunction. ACS Appl Mater Interfaces 2024; 16:8993-9001. [PMID: 38324211 DOI: 10.1021/acsami.3c15535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
Two-dimensional (2D) materials stand as a promising platform for tunnel field-effect transistors (TFETs) in the pursuit of low-power electronics for the Internet of Things era. This promise arises from their dangling bond-free van der Waals heterointerface. Nevertheless, the attainment of high device performance is markedly impeded by the requirement of precise control over the 2D assembly with multiple stacks of different layers. In this study, we addressed a thickness-modulated n/p+-homojunction prepared from Nb-doped p+-MoS2 crystal, where the issue on interface traps can be neglected without any external interface control due to the homojunction. Notably, our observations reveal the existence of a negative differential resistance, even at room temperature (RT). This signifies the successful realization of TFET operation under type III band alignment conditions by a single gate at RT, suggesting that the dominant current mechanism is band-to-band tunneling due to the ideal interface.
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Affiliation(s)
- Tomohiro Fukui
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Tomonori Nishimura
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Keiji Ueno
- Department of Chemistry, Saitama University, Saitama 338-8570, Japan
| | - Takashi Taniguchi
- Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Ibaraki 305-0044, Japan
| | - Kenji Watanabe
- Research Center for Electronic and Optical Materials, National Institute for Materials Science, Ibaraki 305-0044, Japan
| | - Kosuke Nagashio
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
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2
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Kaneda M, Zhang W, Liu Z, Gao Y, Maruyama M, Nakanishi Y, Nakajo H, Aoki S, Honda K, Ogawa T, Hashimoto K, Endo T, Aso K, Chen T, Oshima Y, Yamada-Takamura Y, Takahashi Y, Okada S, Kato T, Miyata Y. Nanoscrolls of Janus Monolayer Transition Metal Dichalcogenides. ACS Nano 2024; 18:2772-2781. [PMID: 38230852 DOI: 10.1021/acsnano.3c05681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Tubular structures of transition metal dichalcogenides (TMDCs) have attracted attention in recent years due to their emergent physical properties, such as the giant bulk photovoltaic effect and chirality-dependent superconductivity. To understand and control these properties, it is highly desirable to develop a sophisticated method to fabricate TMDC tubular structures with smaller diameters and a more uniform crystalline orientation. For this purpose, the rolling up of TMDC monolayers into nanoscrolls is an attractive approach to fabricating such a tubular structure. However, the symmetric atomic arrangement of a monolayer TMDC generally makes its tubular structure energetically unstable due to considerable lattice strain in curved monolayers. Here, we report the fabrication of narrow nanoscrolls by using Janus TMDC monolayers, which have an out-of-plane asymmetric structure. Janus WSSe and MoSSe monolayers were prepared by the plasma-assisted surface atom substitution of WSe2 and MoSe2 monolayers, respectively, and then were rolled by solution treatment. The multilayer tubular structures of Janus nanoscrolls were revealed by scanning transmission electron microscopy observations. Atomic resolution elemental analysis confirmed that the Janus monolayers were rolled up with the Se-side surface on the outside. We found that the present nanoscrolls have the smallest diameter of about 5 nm, which is almost the same as the value predicted by the DFT calculation. The difference in work functions between the S- and Se-side surfaces was measured by Kelvin probe force microscopy, which is in good agreement with the theoretical prediction. Strong interlayer interactions and anisotropic optical responses of the Janus nanoscrolls were also revealed by Raman and photoluminescence spectroscopy.
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Affiliation(s)
- Masahiko Kaneda
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Wenjin Zhang
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
| | - Yanlin Gao
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Mina Maruyama
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Hiroshi Nakajo
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan
- KOKUSAI ELCTRIC CORP., Toyama 939-2393, Japan
| | - Soma Aoki
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Kota Honda
- Department of Electronics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Tomoya Ogawa
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Kazuki Hashimoto
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Kohei Aso
- School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Tongmin Chen
- School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Yoshifumi Oshima
- School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Yukiko Yamada-Takamura
- School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Yasufumi Takahashi
- Department of Electronics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
- WPI Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kanazawa 920-1192, Japan
| | - Susumu Okada
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Toshiaki Kato
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
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3
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Yomogida Y, Nagano M, Liu Z, Ueji K, Rahman MA, Ahad A, Ihara A, Nishidome H, Yagi T, Nakanishi Y, Miyata Y, Yanagi K. Semiconducting Transition Metal Dichalcogenide Heteronanotubes with Controlled Outer-Wall Structures. Nano Lett 2023; 23:10103-10109. [PMID: 37843011 DOI: 10.1021/acs.nanolett.3c01761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Transition metal dichalcogenide (TMDC) nanotubes exhibit unique physical properties due to their nanotube structures. The development of techniques for synthesizing TMDC nanotubes with controlled structures is very important for their science and applications. However, structural control efforts have been made only for the homostructures of TMDC nanotubes and not for their heterostructures that provide an important platform for their two-dimensional counterparts. In this study, we synthesized heterostructures of TMDC nanotubes, MoS2/WS2 heteronanotubes, and demonstrated a technique for controlling features of their structures, such as diameters, layer numbers, and crystallinity. The diameter of the heteronanotubes could be tuned with inner nanotube templates and was reduced by using small-diameter WS2 nanotubes. The layer number and crystallinity of the MoS2 outer wall could be controlled by controlling their precursors and synthesis temperatures, resulting in the formation of high-crystallinity TMDC heteronanotubes with specific chirality. This study can expand the research of van der Waals heterostructures.
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Affiliation(s)
- Yohei Yomogida
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Mai Nagano
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Zheng Liu
- National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8560, Japan
| | - Kan Ueji
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Md Ashiqur Rahman
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
- Department of Physics, Comilla University, Cumilla 3506, Bangladesh
| | - Abdul Ahad
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
- Department of Physics, Comilla University, Cumilla 3506, Bangladesh
| | - Akane Ihara
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Hiroyuki Nishidome
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Takashi Yagi
- National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8563, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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4
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Nakanishi Y, Furusawa S, Sato Y, Tanaka T, Yomogida Y, Yanagi K, Zhang W, Nakajo H, Aoki S, Kato T, Suenaga K, Miyata Y. Structural Diversity of Single-Walled Transition Metal Dichalcogenide Nanotubes Grown via Template Reaction. Adv Mater 2023; 35:e2306631. [PMID: 37795543 DOI: 10.1002/adma.202306631] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/27/2023] [Indexed: 10/06/2023]
Abstract
Monolayers of transition metal dichalcogenides (TMDs) are an ideal 2D platform for studying a wide variety of electronic properties and potential applications due to their chemical diversity. Similarly, single-walled TMD nanotubes (SW-TMDNTs)-seamless cylinders of rolled-up TMD monolayers-are 1D materials that can exhibit tunable electronic properties depending on both their chirality and composition. However, much less has been explored about their geometrical structures and chemical variations due to their instability under ambient conditions. Here, the structural diversity of SW-TMDNTs templated by boron nitride nanotubes (BNNTs) is reported. The outer surfaces and inner cavities of the BNNTs promote and stabilize the coaxial growth of SW-TMDNTs with various diameters, including few-nanometers-wide species. The chiral indices (n,m) of individual SW-MoS2 NTs are assigned by high-resolution transmission electron microscopy, and statistical analyses reveals a broad chirality distribution ranging from zigzag to armchair configurations. Furthermore, this methodology can be applied to the synthesis of various TMDNTs, such as selenides and alloyed Mo1- x Wx S2 . Comprehensive microscopic and spectroscopic analyses also suggest the partial formation of Janus MoS2(1- x ) Se2 x nanotubes. The BNNT-templated reaction provides a universal platform to characterize the chirality-dependent properties of 1D nanotubes with various electronic structures.
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Affiliation(s)
- Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Shinpei Furusawa
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yuta Sato
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan
| | - Takumi Tanaka
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yohei Yomogida
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Wenjin Zhang
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Hiroshi Nakajo
- Department of Electronic Engineering, Tohoku University, 980-8579, Sendai, Japan
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai, 980-8577, Japan
- KOKUSAI ELECTRIC CORP., Toyama, 939-2393, Japan
| | - Soma Aoki
- Department of Electronic Engineering, Tohoku University, 980-8579, Sendai, Japan
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai, 980-8577, Japan
| | - Toshiaki Kato
- Department of Electronic Engineering, Tohoku University, 980-8579, Sendai, Japan
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai, 980-8577, Japan
| | - Kazu Suenaga
- The Institute of Scientific and Industrial Research, Osaka University, Osaka, 567-0047, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
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5
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Peeters W, Toyouchi S, Fujita Y, Wolf M, Fortuni B, Fron E, Inose T, Hofkens J, Endo T, Miyata Y, Uji-i H. Remote Excitation of Tip-Enhanced Photoluminescence with a Parallel AgNW Coupler. ACS Omega 2023; 8:38386-38393. [PMID: 37867716 PMCID: PMC10586305 DOI: 10.1021/acsomega.3c04952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 09/05/2023] [Indexed: 10/24/2023]
Abstract
Tip-enhanced photoluminescence (TEPL) microscopy allows for the correlation of scanning probe microscopic images and photoluminescent spectra at the nanoscale level in a similar way to tip-enhanced Raman scattering (TERS) microscopy. However, due to the higher cross-section of fluorescence compared to Raman scattering, the diffraction-limited background signal generated by far-field excitation is a limiting factor in the achievable spatial resolution of TEPL. Here, we demonstrate a way to overcome this drawback by using remote excitation TEPL (RE-TEPL). With this approach, the excitation and detection positions are spatially separated, minimizing the far-field contribution. Two probe designs are evaluated, both experimentally and via simulations. The first system consists of gold nanoparticles (AuNPs) through photoinduced deposition on a silver nanowire (AgNW), and the second system consists of two offset parallel AgNWs. This latter coupler system shows a higher coupling efficiency and is used to successfully demonstrate RE-TEPL spectral mapping on a MoSe2/WSe2 lateral heterostructure to reveal spatial heterogeneity at the heterojunction.
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Affiliation(s)
- Wannes Peeters
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
| | - Shuichi Toyouchi
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
| | - Yasuhiko Fujita
- Research
Institute for Sustainable Chemistry, National
Institute of Advanced Industrial Science and Technology (AIST Chugoku), Kagamiyama 3-11-32, Higashi-hiroshima, Hiroshima 739-0046, Japan
| | - Mathias Wolf
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
| | - Beatrice Fortuni
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
| | - Eduard Fron
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
| | - Tomoko Inose
- Institute
for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
- The
HAKUBI Center for Advanced Research, Kyoto
University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Johan Hofkens
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
- Max
Planck Institute for Polymer Research, Mainz 55128, Germany
| | - Takahiko Endo
- Department
of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department
of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Hiroshi Uji-i
- Division
of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Heverlee B-3001, Belgium
- Institute
for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
- RIES, Hokkaido University, N20 W10, Kita-Ward, Sapporo 001-0020, Japan
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6
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Rahman MA, Yomogida Y, Ahad A, Ueji K, Nagano M, Ihara A, Nishidome H, Omoto M, Saito S, Miyata Y, Gao Y, Okada S, Yanagi K. Synthesis and optical properties of WS 2 nanotubes with relatively small diameters. Sci Rep 2023; 13:16959. [PMID: 37807007 PMCID: PMC10560667 DOI: 10.1038/s41598-023-44072-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 10/03/2023] [Indexed: 10/10/2023] Open
Abstract
Tungsten disulfide (WS2) nanotubes exhibit various unique properties depending on their structures, such as their diameter and wall number. The development of techniques to prepare WS2 nanotubes with the desired structure is crucial for understanding their basic properties. Notably, the synthesis and characterization of multi-walled WS2 nanotubes with small diameters are challenging. This study reports the synthesis and characterization of small-diameter WS2 nanotubes with an average inner diameter of 6 nm. The optical absorption and photoluminescence (PL) spectra of the as-prepared nanotubes indicate that a decrease in the nanotube diameter induces a red-shift in the PL, suggesting that the band gap narrowed due to a curvature effect, as suggested by theoretical calculations.
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Affiliation(s)
- Md Ashiqur Rahman
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
- Department of Physics, Comilla University, Cumilla, 3506, Bangladesh
| | - Yohei Yomogida
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan.
| | - Abdul Ahad
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
- Department of Physics, Comilla University, Cumilla, 3506, Bangladesh
| | - Kan Ueji
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Mai Nagano
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Akane Ihara
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Hiroyuki Nishidome
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Mikito Omoto
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Shigeki Saito
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Yanlin Gao
- Department of Physics, Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Susumu Okada
- Department of Physics, Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan.
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7
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Naito H, Makino Y, Zhang W, Ogawa T, Endo T, Sannomiya T, Kaneda M, Hashimoto K, Lim HE, Nakanishi Y, Watanabe K, Taniguchi T, Matsuda K, Miyata Y. High-throughput dry transfer and excitonic properties of twisted bilayers based on CVD-grown transition metal dichalcogenides. Nanoscale Adv 2023; 5:5115-5121. [PMID: 37705802 PMCID: PMC10496764 DOI: 10.1039/d3na00371j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 08/21/2023] [Indexed: 09/15/2023]
Abstract
van der Waals (vdW) layered materials have attracted much attention because their physical properties can be controlled by varying the twist angle and layer composition. However, such twisted vdW assemblies are often prepared using mechanically exfoliated monolayer flakes with unintended shapes through a time-consuming search for such materials. Here, we report the rapid and dry fabrication of twisted multilayers using chemical vapor deposition (CVD) grown transition metal chalcogenide (TMDC) monolayers. By improving the adhesion of an acrylic resin stamp to the monolayers, the single crystals of various TMDC monolayers with desired grain size and density on a SiO2/Si substrate can be efficiently picked up. The present dry transfer process demonstrates the one-step fabrication of more than 100 twisted bilayers and the sequential stacking of a twisted 10-layer MoS2 single crystal. Furthermore, we also fabricated hBN-encapsulated TMDC monolayers and various twisted bilayers including MoSe2/MoS2, MoSe2/WSe2, and MoSe2/WS2. The interlayer interaction and quality of dry-transferred, CVD-grown TMDCs were characterized by using photoluminescence (PL), cathodoluminescence (CL) spectroscopy, and cross-sectional electron microscopy. The prominent PL peaks of interlayer excitons can be observed for MoSe2/MoS2 and MoSe2/WSe2 with small twist angles at room temperature. We also found that the optical spectra were locally modulated due to nanosized bubbles, which are formed by the presence of interface carbon impurities. The present findings indicate the widely applicable potential of the present method and enable an efficient search of the emergent optical and electrical properties of TMDC-based vdW heterostructures.
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Affiliation(s)
- Hibiki Naito
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Yasuyuki Makino
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Wenjin Zhang
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Tomoya Ogawa
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Takumi Sannomiya
- Department of Materials Science and Engineering, Tokyo Institute of Technology Yokohama 226-8503 Japan
| | - Masahiko Kaneda
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Kazuki Hashimoto
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Hong En Lim
- Department of Chemistry, Saitama University Saitama 338-8570 Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Kenji Watanabe
- Research Center for Electronic and Optical Materials, NIMS Tsukuba 305-0044 Japan
| | - Takashi Taniguchi
- Research Center for Materials Nanoarchitectonics, NIMS Tsukuba 305-0044 Japan
| | - Kazunari Matsuda
- Institute of Advanced Energy, Kyoto University Kyoto 611-0011 Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
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8
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Suzuki H, Kishibuchi M, Misawa M, Shimogami K, Ochiai S, Kokura T, Liu Y, Hashimoto R, Liu Z, Tsuruta K, Miyata Y, Hayashi Y. Self-Limiting Growth of Monolayer Tungsten Disulfide Nanoribbons on Tungsten Oxide Nanowires. ACS Nano 2023; 17:9455-9467. [PMID: 37127554 DOI: 10.1021/acsnano.3c01608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Transition metal dichalcogenides (TMDCs) are promising two-dimensional (2D) materials for next-generation optoelectronic devices; they can also provide opportunities for further advances in physics. Structuring 2D TMDC sheets as nanoribbons has tremendous potential for electronic state modification. However, a bottom-up synthesis of long TMDC nanoribbons with high monolayer selectivity on a large scale has not yet been reported yet. In this study, we successfully synthesized long WxOy nanowires and grew monolayer WS2 nanoribbons on their surface. The supply of source atoms from a vapor-solid bilayer and chemical reaction at the atomic-scale interface promoted a self-limiting growth process. The developed method exhibited a high monolayer selection yield on a large scale and enabled the growth of long (∼100 μm) WS2 nanoribbons with electronic properties characterized by optical spectroscopy and electrical transport measurements. The produced nanoribbons were isolated from WxOy nanowires by mechanical exfoliation and used as channels for field-effect transistors. The findings of this study can be used in future optoelectronic device applications and advanced physics research.
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Affiliation(s)
- Hiroo Suzuki
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Misaki Kishibuchi
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Masaaki Misawa
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Kazuma Shimogami
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Soya Ochiai
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Takahiro Kokura
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Yijun Liu
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Ryoki Hashimoto
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Kenji Tsuruta
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Yasuhiko Hayashi
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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9
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Ogura H, Kawasaki S, Liu Z, Endo T, Maruyama M, Gao Y, Nakanishi Y, Lim HE, Yanagi K, Irisawa T, Ueno K, Okada S, Nagashio K, Miyata Y. Multilayer In-Plane Heterostructures Based on Transition Metal Dichalcogenides for Advanced Electronics. ACS Nano 2023; 17:6545-6554. [PMID: 36847351 DOI: 10.1021/acsnano.2c11927] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
In-plane heterostructures of transition metal dichalcogenides (TMDCs) have attracted much attention for high-performance electronic and optoelectronic devices. To date, mainly monolayer-based in-plane heterostructures have been prepared by chemical vapor deposition (CVD), and their optical and electrical properties have been investigated. However, the low dielectric properties of monolayers prevent the generation of high concentrations of thermally excited carriers from doped impurities. To solve this issue, multilayer TMDCs are a promising component for various electronic devices due to the availability of degenerate semiconductors. Here, we report the fabrication and transport properties of multilayer TMDC-based in-plane heterostructures. The multilayer in-plane heterostructures are formed through CVD growth of multilayer MoS2 from the edges of mechanically exfoliated multilayer flakes of WSe2 or NbxMo1-xS2. In addition to the in-plane heterostructures, we also confirmed the vertical growth of MoS2 on the exfoliated flakes. For the WSe2/MoS2 sample, an abrupt composition change is confirmed by cross-sectional high-angle annular dark-field scanning transmission electron microscopy. Electrical transport measurements reveal that a tunneling current flows at the NbxMo1-xS2/MoS2 in-plane heterointerface, and the band alignment is changed from a staggered gap to a broken gap by electrostatic electron doping of MoS2. The formation of a staggered gap band alignment of NbxMo1-xS2/MoS2 is also supported by first-principles calculations.
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Affiliation(s)
- Hiroto Ogura
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Seiya Kawasaki
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Mina Maruyama
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yanlin Gao
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Hong En Lim
- Department of Chemistry, Saitama University, Saitama 338-8570, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Toshifumi Irisawa
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - Keiji Ueno
- Department of Chemistry, Saitama University, Saitama 338-8570, Japan
| | - Susumu Okada
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Kosuke Nagashio
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
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10
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Natsui R, Shimizu H, Nakanishi Y, Liu Z, Shimamura A, Hung NT, Lin YC, Endo T, Pu J, Kikuchi I, Takenobu T, Okada S, Suenaga K, Saito R, Miyata Y. Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W 6Te 6 Wires. ACS Nano 2023; 17:5561-5569. [PMID: 36820647 DOI: 10.1021/acsnano.2c10997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
One-dimensional (1D) conducting materials are of great interest as potential building blocks for integrated nanocircuits. Ternary 1D transition-metal chalcogenides, consisting of M6X6 wires with intercalated A atoms (M = Mo or W; X = S, Se, or Te; A = alkali or rare metals, etc.), have attracted much attention due to their 1D metallic behavior, superconductivity, and mechanical flexibility. However, the conventional solid-state reaction usually produces micrometer-scale bulk crystals, limiting their potential use as nanoscale conductors. Here we demonstrate a versatile method to fabricate indium (In)-intercalated W6Te6 (In-W6Te6) bundles with a nanoscale thickness. We first prepared micrometer-long, crystalline bundles of van der Waals W6Te6 wires using chemical vapor deposition and intercalated In into the crystal via a vapor-phase reaction. Atomic-resolution electron microscopy revealed that In atoms were surrounded by three adjacent W6Te6 wires. First-principles calculations suggested that their wire-by-wire stacking can transform through postgrowth intercalation. Individual In-W6Te6 bundles exhibited metallic behavior, as theoretically predicted. We further identified the vibrational modes by combining polarized Raman spectroscopy and nonresonant Raman calculations.
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Affiliation(s)
- Ryusuke Natsui
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Hiroshi Shimizu
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
| | - Akito Shimamura
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Nguyen Tuan Hung
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
| | - Yung-Chang Lin
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Iori Kikuchi
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Susumu Okada
- Department of Physics, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Kazu Suenaga
- The Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
| | - Riichiro Saito
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
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11
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Zhang S, Maruyama M, Okada S, Xue M, Watanabe K, Taniguchi T, Hashimoto K, Miyata Y, Canton-Vitoria R, Kitaura R. Observation of the photovoltaic effect in a van der Waals heterostructure. Nanoscale 2023; 15:5948-5953. [PMID: 36883438 DOI: 10.1039/d2nr06616e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
van der Waals (vdW) heterostructures, which can be assembled with various two-dimensional materials, provide a versatile platform for exploring emergent phenomena. Here, we report an observation of the photovoltaic effect in a WS2/MoS2 vdW heterostructure. Light excitation of WS2/MoS2 at a wavelength of 633 nm yields a photocurrent without applying bias voltages, and the excitation power dependence of the photocurrent shows characteristic crossover from a linear to square root dependence. Photocurrent mapping has clearly shown that the observed photovoltaic effect arises from the WS2/MoS2 region, not from Schottky junctions at electrode contacts. Kelvin probe microscopy observations show no slope in the electrostatic potential, excluding the possibility that the photocurrent originates from an unintentionally formed built-in potential.
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Affiliation(s)
- Shaochun Zhang
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan.
| | - Mina Maruyama
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan
| | - Susumu Okada
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan
| | - Mengsong Xue
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan.
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Takashi Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Kazuki Hashimoto
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | | | - Ryo Kitaura
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan.
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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12
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Pu J, Ou H, Yamada T, Wada N, Naito H, Ogura H, Endo T, Liu Z, Irisawa T, Yanagi K, Nakanishi Y, Gao Y, Maruyama M, Okada S, Shinokita K, Matsuda K, Miyata Y, Takenobu T. Continuous Color-Tunable Light-Emitting Devices Based on Compositionally Graded Monolayer Transition Metal Dichalcogenide Alloys. Adv Mater 2022; 34:e2203250. [PMID: 36086880 DOI: 10.1002/adma.202203250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 08/29/2022] [Indexed: 06/15/2023]
Abstract
The diverse series of transition metal dichalcogenide (TMDC) materials has been employed in various optoelectronic applications, such as photodetectors, light-emitting diodes, and lasers. Typically, the detection or emission range of optoelectronic devices is unique to the bandgap of the active material. Therefore, to improve the capability of these devices, extensive efforts have been devoted to tune the bandgap, such as gating, strain, and dielectric engineering. However, the controllability of these methods is severely limited (typically ≈0.1 eV). In contrast, alloying TMDCs is an effective approach that yields a composition-dependent bandgap and enables light emissions over a wide range. In this study, a color-tunable light-emitting device using compositionally graded TMDC alloys is fabricated. The monolayer WS2 /WSe2 alloy grown by chemical vapor deposition shows a spatial gradient in the light-emission energy, which varies from 2.1 to 1.7 eV. This alloy is incorporated in an electrolyte-based light-emitting device structure that can tune the recombination zone laterally. Thus, a continuous and reversible color-tunable light-emitting device is successfully fabricated by controlling the light-emitting positions. The results provide a new approach for exploring monolayer semiconductor-based broadband optical applications.
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Affiliation(s)
- Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Hao Ou
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Tomoyuki Yamada
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Naoki Wada
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Hibiki Naito
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Hiroto Ogura
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, AIST, Nagoya, 463-8560, Japan
| | - Toshifumi Irisawa
- Device Technology Research Institute, AIST, Tsukuba, 305-8562, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yanlin Gao
- Department of Physics, University of Tsukuba, Tsukuba, 305-8571, Japan
| | - Mina Maruyama
- Department of Physics, University of Tsukuba, Tsukuba, 305-8571, Japan
| | - Susumu Okada
- Department of Physics, University of Tsukuba, Tsukuba, 305-8571, Japan
| | - Keisuke Shinokita
- Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011, Japan
| | - Kazunari Matsuda
- Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
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13
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Furusawa S, Nakanishi Y, Yomogida Y, Sato Y, Zheng Y, Tanaka T, Yanagi K, Suenaga K, Maruyama S, Xiang R, Miyata Y. Surfactant-Assisted Isolation of Small-Diameter Boron-Nitride Nanotubes for Molding One-Dimensional van der Waals Heterostructures. ACS Nano 2022; 16:16636-16644. [PMID: 36195582 DOI: 10.1021/acsnano.2c06067] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Rolling two-dimensional (2D) materials into 1D nanotubes allows for greater functionality. Boron-nitride nanotubes (BNNTs) can serve as insulating 1D templates for the coaxial growth of guest nanotubes, without interfering with property characterization. However, their application as 1D templates has been greatly hindered by their poor dispersibility, inevitably resulting in the formation of thick bundles. Here we present the facile preparation of well-dispersed BNNT templates via surfactant dispersions and synthesis of 1D van der Waals heterostructures based on the BNNTs. Comprehensive microscopic analyses show the isolation of clean, high-quality BNNTs. Statistical analyses revealed that small-diameter double-walled BNNTs are highly enriched by chemical peeling of BN sidewalls through the sonication process. We further demonstrate that the isolated BNNTs can template the coaxial growth of carbon and MoS2 nanotubes by using chemical vapor deposition. The present strategy can be applied to the synthesis of a variety of nanotubes, thereby allowing for their characterization.
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Affiliation(s)
- Shinpei Furusawa
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Yohei Yomogida
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Yuta Sato
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Yongjia Zheng
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8565, Japan
| | - Takumi Tanaka
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Kazu Suenaga
- The Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
| | - Shigeo Maruyama
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8565, Japan
| | - Rong Xiang
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8565, Japan
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
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14
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Okada M, Pu J, Lin YC, Endo T, Okada N, Chang WH, Lu AKA, Nakanishi T, Shimizu T, Kubo T, Miyata Y, Suenaga K, Takenobu T, Yamada T, Irisawa T. Large-Scale 1T'-Phase Tungsten Disulfide Atomic Layers Grown by Gas-Source Chemical Vapor Deposition. ACS Nano 2022; 16:13069-13081. [PMID: 35849128 DOI: 10.1021/acsnano.2c05699] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The control of crystal polymorphism and exploration of metastable, two-dimensional, 1T'-phase, transition-metal dichalcogenides (TMDs) have received considerable research attention. 1T'-phase TMDs are expected to offer various opportunities for the study of basic condensed matter physics and for its use in important applications, such as devices with topological states for quantum computing, low-resistance contact for semiconducting TMDs, energy storage devices, and as hydrogen evolution catalysts. However, due to the high energy difference and phase change barrier between 1T' and the more stable 2H-phase, there are few methods that can be used to obtain monolayer 1T'-phase TMDs. Here, we report on the chemical vapor deposition (CVD) growth of 1T'-phase WS2 atomic layers from gaseous precursors, i.e., H2S and WF6, with alkali metal assistance. The gaseous nature of the precursors, reducing properties of H2S, and presence of Na+, which acts as a countercation, provided an optimal environment for the growth of 1T'-phase WS2, resulting in the formation of high-quality submillimeter-sized crystals. The crystal structure was characterized by atomic-resolution scanning transmission electron microscopy, and the zigzag chain structure of W atoms, which is characteristic of the 1T' structure, was clearly observed. Furthermore, the grown 1T'-phase WS2 showed superconductivity with the transition temperature in the 2.8-3.4 K range and large upper critical field anisotropy. Thus, alkali metal assisted gas-source CVD growth is useful for realizing large-scale, high-quality, phase-engineered TMD atomic layers via a bottom-up synthesis.
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Affiliation(s)
- Mitsuhiro Okada
- Nano Carbon Device Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Yung-Chang Lin
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Naoya Okada
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - Wen-Hsin Chang
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - Anh Khoa Augustin Lu
- Mathematics for Advanced Materials Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Sendai 980-8577, Japan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
| | - Takeshi Nakanishi
- Mathematics for Advanced Materials Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Sendai 980-8577, Japan
| | - Tetsuo Shimizu
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Toshitaka Kubo
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Kazu Suenaga
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka 567-0047, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Takatoshi Yamada
- Nano Carbon Device Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Toshifumi Irisawa
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
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15
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Suzuki H, Hashimoto R, Misawa M, Liu Y, Kishibuchi M, Ishimura K, Tsuruta K, Miyata Y, Hayashi Y. Surface Diffusion-Limited Growth of Large and High-Quality Monolayer Transition Metal Dichalcogenides in Confined Space of Microreactor. ACS Nano 2022; 16:11360-11373. [PMID: 35793540 DOI: 10.1021/acsnano.2c05076] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Transition metal dichalcogenides (TMDCs), including MoS2 and WS2, are potential candidates for next-generation semiconducting materials owing to their atomically thin structure and strong optoelectrical responses, which allow for flexible optoelectronic applications. Monolayer TMDCs have been grown utilizing chemical vapor deposition (CVD) techniques. Enhancing the domain size with high crystallinity and forming heterostructures are important topics for practical applications. In this study, the size of monolayer WS2 increased via the vapor-liquid-solid growth-based CVD technique utilizing the confined space of the substrate-stacked microreactor. The use of spin-coated metal salts (Na2WO4 and Na2MoO4) and organosulfur vapor allowed us to precisely control the source supply and investigate the growth in a systematic manner. We obtained a relatively low activation energy for growth (1.02 eV), which is consistent with the surface diffusion-limited growth regime observed in the confined space. Through systematic photoluminescence (PL) analysis, we determined that a growth temperature of ∼820 °C is optimal for producing high-quality WS2 with a narrow PL peak width (∼35 meV). By controlling the source balance of W and S, we obtained large-sized fully monolayered WS2 (∼560 μm) and monolayer WS2 with bilayer spots (∼1100 μm). Combining two distinct sources of transition metals, WS2/MoS2 lateral heterostructures were successfully created. In electrical transport measurements, the monolayer WS2 grown under optimal conditions has a high on-current (∼70 μA/μm), on/off ratio (∼5 × 108), and a field-effect mobility of ∼7 cm2/(V s). The field-effect transistor displayed an intrinsic photoresponse with wavelength selectivity that originated from the photoexcited carriers.
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Affiliation(s)
- Hiroo Suzuki
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Ryoki Hashimoto
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Masaaki Misawa
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Yijun Liu
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Misaki Kishibuchi
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Kentaro Ishimura
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Kenji Tsuruta
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Yasuhiko Hayashi
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Faculty of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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16
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Shimasaki M, Nishihara T, Matsuda K, Endo T, Takaguchi Y, Liu Z, Miyata Y, Miyauchi Y. Directional Exciton-Energy Transport in a Lateral Heteromonolayer of WSe 2-MoSe 2. ACS Nano 2022; 16:8205-8212. [PMID: 35481755 DOI: 10.1021/acsnano.2c01890] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Controlling the direction of exciton-energy flow in two-dimensional (2D) semiconductors is crucial for developing future high-speed optoelectronic devices using excitons as the information carriers. However, intrinsic exciton diffusion in conventional 2D semiconductors is omnidirectional, and efficient exciton-energy transport in a specific direction is difficult to achieve. Here we demonstrate directional exciton-energy transport across the interface in tungsten diselenide (WSe2)-molybdenum diselenide (MoSe2) lateral heterostructures. Unidirectional transport is spontaneously driven by the built-in asymmetry of the exciton-energy landscape with respect to the heterojunction interface. At excitation positions close to the interface, the exciton photoluminescence (PL) intensity was substantially decreased in the WSe2 region and enhanced in the MoSe2 region. In PL excitation spectroscopy, it was confirmed that the observed phenomenon arises from lateral exciton-energy transport from WSe2 to MoSe2. This directional exciton-energy flow in lateral 2D heterostructures can be exploited in future optoelectronic devices.
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Affiliation(s)
- Masafumi Shimasaki
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Taishi Nishihara
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Kazunari Matsuda
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo 192-0397, Japan
| | - Yuhei Takaguchi
- Department of Physics, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo 192-0397, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo 192-0397, Japan
| | - Yuhei Miyauchi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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17
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Ago H, Okada S, Miyata Y, Matsuda K, Koshino M, Ueno K, Nagashio K. Science of 2.5 dimensional materials: paradigm shift of materials science toward future social innovation. Sci Technol Adv Mater 2022; 23:275-299. [PMID: 35557511 PMCID: PMC9090349 DOI: 10.1080/14686996.2022.2062576] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/29/2022] [Accepted: 03/30/2022] [Indexed: 05/22/2023]
Abstract
The past decades of materials science discoveries are the basis of our present society - from the foundation of semiconductor devices to the recent development of internet of things (IoT) technologies. These materials science developments have depended mainly on control of rigid chemical bonds, such as covalent and ionic bonds, in organic molecules and polymers, inorganic crystals and thin films. The recent discovery of graphene and other two-dimensional (2D) materials offers a novel approach to synthesizing materials by controlling their weak out-of-plane van der Waals (vdW) interactions. Artificial stacks of different types of 2D materials are a novel concept in materials synthesis, with the stacks not limited by rigid chemical bonds nor by lattice constants. This offers plenty of opportunities to explore new physics, chemistry, and engineering. An often-overlooked characteristic of vdW stacks is the well-defined 2D nanospace between the layers, which provides unique physical phenomena and a rich field for synthesis of novel materials. Applying the science of intercalation compounds to 2D materials provides new insights and expectations about the use of the vdW nanospace. We call this nascent field of science '2.5 dimensional (2.5D) materials,' to acknowledge the important extra degree of freedom beyond 2D materials. 2.5D materials not only offer a new field of scientific research, but also contribute to the development of practical applications, and will lead to future social innovation. In this paper, we introduce the new scientific concept of this science of '2.5D materials' and review recent research developments based on this new scientific concept.
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Affiliation(s)
- Hiroki Ago
- Global Innovation Center, Kyushu University, Fukuoka, Japan
- CONTACT Hiroki Ago Global Innovation Center, Kyushu University, Fukuoka816-8580, Japan
| | - Susumu Okada
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Japan
| | | | | | - Kosei Ueno
- Department of Chemistry, Faculty of Science, Hokkaido University, Hokkaido, Japan
| | - Kosuke Nagashio
- Department of Materials Engineering, University of Tokyo, Tokyo, Japan
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18
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Murai Y, Zhang S, Hotta T, Liu Z, Endo T, Shimizu H, Miyata Y, Irisawa T, Gao Y, Maruyama M, Okada S, Mogi H, Sato T, Yoshida S, Shigekawa H, Taniguchi T, Watanabe K, Canton-Vitoria R, Kitaura R. Versatile Post-Doping toward Two-Dimensional Semiconductors. ACS Nano 2021; 15:19225-19232. [PMID: 34843228 DOI: 10.1021/acsnano.1c04584] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We have developed a simple and straightforward way to realize controlled postdoping toward 2D transition metal dichalcogenides (TMDs). The key idea is to use low-kinetic-energy dopant beams and a high-flux chalcogen beam simultaneously, leading to substitutional doping with controlled dopant densities. Atomic-resolution transmission electron microscopy has revealed that dopant atoms injected toward TMDs are incorporated substitutionally into the hexagonal framework of TMDs. The electronic properties of doped TMDs (Nb-doped WSe2) have shown drastic change and p-type action with more than 2 orders of magnitude increase in current. Position-selective doping has also been demonstrated by the postdoping toward TMDs with a patterned mask on the surface. The postdoping method developed in this work can be a versatile tool for 2D-based next-generation electronics in the future.
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Affiliation(s)
- Yuya Murai
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Shaochun Zhang
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Takato Hotta
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8560, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Hiroshi Shimizu
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Toshifumi Irisawa
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Yanlin Gao
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Mina Maruyama
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Susumu Okada
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Hiroyuki Mogi
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Tomohiro Sato
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Shoji Yoshida
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Hidemi Shigekawa
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Tsukuba 305-8571, Japan
| | - Takashi Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | | | - Ryo Kitaura
- Department of Chemistry, Nagoya University, Nagoya, Aichi 464-8602, Japan
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19
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Yuan W, Ueji K, Yagi T, Endo T, Lim HE, Miyata Y, Yomogida Y, Yanagi K. Control of Thermal Conductance across Vertically Stacked Two-Dimensional van der Waals Materials via Interfacial Engineering. ACS Nano 2021; 15:15902-15909. [PMID: 34585910 DOI: 10.1021/acsnano.1c03822] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A comprehensive understanding of the roles of various nanointerfaces in thermal transport is of critical significance but remains challenging. A two-dimensional van der Waals (vdW) heterostructure with tunable interface lattice mismatch provides an ideal platform to explore the correlation between thermal properties and nanointerfaces and achieve controllable tuning of heat flow. Here, we demonstrate that interfacial engineering is an efficient strategy to tune thermal transport via systematic investigation of the thermal conductance (G) across a series of large-area four-layer stacked vdW materials using an improved polyethylene glycol-assisted time-domain thermoreflectance method. Owing to its rich interfacial mismatch and weak interfacial coupling, the vertically stacked MoSe2-MoS2-MoSe2-MoS2 heterostructure demonstrates the lowest G of 1.5 MW m-2 K-1 among all vdW structures. A roadmap to tune G via homointerfacial mismatch, interfacial coupling, and heterointerfacial mismatch is further demonstrated for thermal tuning. Our work reveals the roles of various interfacial effects on heat flow and highlights the importance of the interfacial mismatch and coupling effects in thermal transport. The design principle is also promising for application in other areas, such as the electrical tuning of energy storage and conversion and the thermoelectricity tuning of thermoelectronics.
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Affiliation(s)
- Wenyu Yuan
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Kan Ueji
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Takashi Yagi
- National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Hong En Lim
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yohei Yomogida
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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20
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Tsutani Y, Ito M, Mimae T, Miyata Y, Shimada Y, Ito H, Ikeda N, Nakayama H, Okada M. MA08.03 Adjuvant Chemotherapy for Patients with High-Risk Stage I Lung Adenocarcinoma Stratified by Epidermal Growth Factor Receptor Mutation Status. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Pu J, Zhang W, Matsuoka H, Kobayashi Y, Takaguchi Y, Miyata Y, Matsuda K, Miyauchi Y, Takenobu T. Room-Temperature Chiral Light-Emitting Diode Based on Strained Monolayer Semiconductors. Adv Mater 2021; 33:e2100601. [PMID: 34302397 DOI: 10.1002/adma.202100601] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 05/26/2021] [Indexed: 06/13/2023]
Abstract
Room-temperature chiral light sources whose optical helicity can be electrically switched are one of the most important devices for future optical quantum information processing. The emerging valley degree of freedom in monolayer semiconductors allows generation of chiral luminescence via valley polarization. However, relevant valley-polarized light-emitting diodes (LEDs) have only been achieved at low temperatures (typically below 80 K). Here, a room-temperature chiral LED with strained transition metal dichalcogenide monolayers is realized. Spatially resolved polarization spectroscopy reveals that strain effects are crucial to yielding robust valley-polarized electroluminescence. The broken threefold rotational symmetry of strained monolayers induce inequivalent valley drifts at the K/K' valleys, resulting in different amounts of spin recombination driven by electric fields. Based on this scenario, ideally strained conditions are designed for LEDs on flexible substrates, in which the helicity of room-temperature valley-polarized electroluminescence is electrically tuned. The results provide a new pathway for practical chiral light sources based on monolayer semiconductors.
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Affiliation(s)
- Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Wenjin Zhang
- Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011, Japan
| | - Hirofumi Matsuoka
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Yu Kobayashi
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yuhei Takaguchi
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Kazunari Matsuda
- Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011, Japan
| | - Yuhei Miyauchi
- Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
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22
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Ou H, Matsuoka H, Tempia J, Yamada T, Takahashi T, Oi K, Takaguchi Y, Endo T, Miyata Y, Chen CH, Li LJ, Pu J, Takenobu T. Spatial Control of Dynamic p-i-n Junctions in Transition Metal Dichalcogenide Light-Emitting Devices. ACS Nano 2021; 15:12911-12921. [PMID: 34309369 DOI: 10.1021/acsnano.1c01242] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Emerging transition metal dichalcogenides (TMDCs) offer an attractive platform for investigating functional light-emitting devices, such as flexible devices, quantum and chiral devices, high-performance optical modulators, and ultralow threshold lasers. In these devices, the key operation is to control the light-emitting position, that is, the spatial position of the recombination zone to generate electroluminescence, which permits precise light guides/passes/confinement to ensure favorable device performance. Although various structures of TMDC light-emitting devices have been demonstrated, including the transistor configuration and heterostructured diodes, it is still difficult to tune the light-emitting position precisely owing to the structural device complexity. In this study, we fabricated two-terminal light-emitting devices with chemically synthesized WSe2, MoSe2, and WS2 monolayers, and performed direct observations of their electroluminescence, from which we discovered a divergence in their light-emitting positions. Subsequently, we propose a method to associate spatial electroluminescence imaging with transport properties among different samples; consequently, a common rule for determining the locations of recombination zones is revealed. Owing to dynamic carrier accumulations and p-i-n junction formations, the light-emitting positions in electrolyte-based devices can be tuned continuously. The proposed method will expand the device applicability for designing functional optoelectronic applications based on TMDCs.
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Affiliation(s)
- Hao Ou
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Hirofumi Matsuoka
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Juliette Tempia
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Tomoyuki Yamada
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Togo Takahashi
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Koshi Oi
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Yuhei Takaguchi
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Chang-Hsiao Chen
- Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Lain-Jong Li
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
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23
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Mitsunari K, Miyata Y, Matsuo T, Ohba K, Mukae Y, Otsubo A, Harada J, Matsuda T, Mochizuki Y, Sakai H. KIBRA plays as tumour suppressor via phosphorylation of LATS-2 in conventional renal cell carcinoma tissues. Eur Urol 2021. [DOI: 10.1016/s0302-2838(21)00931-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Kondo T, Miyata Y, Matsuda T, Harada J, Mukae Y, Ohtsubo A, Mitsunari K, Matsuo T, Ohba K, Sakai H. Pathological significance and prognostic utility of KIBRA in upper urinary tract urothelial cancer. Eur Urol 2021. [DOI: 10.1016/s0302-2838(21)01161-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Miyata Y, Matsuo T, Ohba K, Mitsunari K, Keisuke T, Hayashida Y, Tsurusaki T, Watanabe J, Nishimura N, Nishikido M, Sakai H. A randomized clinical trial of intravesical instillation of MMC and combination of MMC and Ara-C in non-muscle invasive bladder cancer. Eur Urol 2021. [DOI: 10.1016/s0302-2838(21)01141-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Ogura H, Kaneda M, Nakanishi Y, Nonoguchi Y, Pu J, Ohfuchi M, Irisawa T, Lim HE, Endo T, Yanagi K, Takenobu T, Miyata Y. Air-stable and efficient electron doping of monolayer MoS 2 by salt-crown ether treatment. Nanoscale 2021; 13:8784-8789. [PMID: 33928997 DOI: 10.1039/d1nr01279g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
To maximize the potential of transition-metal dichalcogenides (TMDCs) in device applications, the development of a sophisticated technique for stable and highly efficient carrier doping is critical. Here, we report the efficient n-type doping of monolayer MoS2 using KOH/benzo-18-crown-6, resulting in a doped TMDC that is air-stable. MoS2 field-effect transistors show an increase in on-current of three orders of magnitude and degenerate the n-type behaviour with high air-stability for ∼1 month as the dopant concentration increases. Transport measurements indicate a high electron density of 3.4 × 1013 cm-2 and metallic-type temperature dependence for highly doped MoS2. First-principles calculations support electron doping via surface charge transfer from the K/benzo-18-crown-6 complex to monolayer MoS2. Patterned doping is demonstrated to improve the contact resistance in MoS2-based devices.
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Affiliation(s)
- Hiroto Ogura
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
| | - Masahiko Kaneda
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
| | - Yoshiyuki Nonoguchi
- Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Mari Ohfuchi
- Fujitsu Laboratories Ltd, Atsugi, 243-0197, Japan
| | | | - Hong En Lim
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan.
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27
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Ito M, Miyata Y, Tsutani Y, Ito H, Nakayama H, Imai K, Ikeda N, Okada M. MA09.09 EGFR Mutation Status Is a Risk of Recurrence in pN0–1 Lung Adenocarcinoma When Considering pStage and Histological Subtype. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Sato H, Miyata Y, Inoue H, Tanaka A, Sagara H. Efficacy of Mepolizumab Extended Interval Dosing For Two Asthmatic Cases with Chronic Eosinophilic Pneumonia. J Investig Allergol Clin Immunol 2021; 31:459-460. [PMID: 33502319 DOI: 10.18176/jiaci.0671] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- H Sato
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - Y Miyata
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - H Inoue
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - A Tanaka
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - H Sagara
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
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29
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Lim HE, Nakanishi Y, Liu Z, Pu J, Maruyama M, Endo T, Ando C, Shimizu H, Yanagi K, Okada S, Takenobu T, Miyata Y. Wafer-Scale Growth of One-Dimensional Transition-Metal Telluride Nanowires. Nano Lett 2021; 21:243-249. [PMID: 33307702 DOI: 10.1021/acs.nanolett.0c03456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The development of bulk synthetic processes to prepare functional nanomaterials is crucial to achieve progress in fundamental and applied science. Transition-metal chalcogenide (TMC) nanowires, which are one-dimensional (1D) structures having three-atom diameters and van der Waals surfaces, have been reported to possess a 1D metallic nature with great potential in electronics and energy devices. However, their mass production remains challenging. Here, a wafer-scale synthesis of highly crystalline transition-metal telluride nanowires is demonstrated by chemical vapor deposition. The present technique enables formation of either aligned, atomically thin two-dimensional (2D) sheets or random networks of three-dimensional (3D) bundles, both composed of individual nanowires. These nanowires exhibit an anisotropic 1D optical response and superior conducting properties. The findings not only shed light on the controlled and large-scale synthesis of conductive thin films but also provide a platform for the study on physics and device applications of nanowire-based 2D and 3D crystals.
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Affiliation(s)
- Hong En Lim
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Zheng Liu
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
| | - Jiang Pu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Mina Maruyama
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Chisato Ando
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Hiroshi Shimizu
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
| | - Susumu Okada
- Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
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30
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Miyata Y, Inoue H, Homma T, Tanaka A, Sagara H. Efficacy of Benralizumab and Clinical Course of IgG4 in Eosinophilic Granulomatosis With Polyangiitis. J Investig Allergol Clin Immunol 2020; 31:346-348. [PMID: 33030432 DOI: 10.18176/jiaci.0648] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Y Miyata
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - H Inoue
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - T Homma
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - A Tanaka
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
| | - H Sagara
- Department of Internal Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
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31
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Kanda N, Nakanishi Y, Liu D, Liu Z, Inoue T, Miyata Y, Tománek D, Shinohara H. Efficient growth and characterization of one-dimensional transition metal tellurides inside carbon nanotubes. Nanoscale 2020; 12:17185-17190. [PMID: 32492076 DOI: 10.1039/d0nr03129a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Atomically thin one-dimensional (1D) van der Waals wires of transition metal monochalocogenides (TMMs) have been anticipated as promising building blocks for integrated nanoelectronics. While reliable production of TMM nanowires has eluded scientists over the past few decades, we finally demonstrated a bottom-up fabrication of MoTe nanowires inside carbon nanotubes (CNTs). Still, the current synthesis method is based on vacuum annealing of reactive MoTe2, and limits access to a variety of TMMs. Here we report an expanded framework for high-yield synthesis of the 1D tellurides including WTe, an previously unknown family of TMMs. Experimental and theoretical analyses revealed that the choice of suitable metal oxides as a precursor provides a useful yield for their characterization. These TMM nanowires exhibit a significant optical absorption in the visible-light region. More important, electronic properties of CNTs can be tuned by encapsulating different TMM nanowires.
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Affiliation(s)
- Naoyuki Kanda
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
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32
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Nishidome H, Nagai K, Uchida K, Ichinose Y, Yomogida Y, Miyata Y, Tanaka K, Yanagi K. Control of High-Harmonic Generation by Tuning the Electronic Structure and Carrier Injection. Nano Lett 2020; 20:6215-6221. [PMID: 32787188 DOI: 10.1021/acs.nanolett.0c02717] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
High-harmonic generation (HHG), which is the generation of light with multiple optical harmonics, is an unconventional nonlinear optical phenomenon beyond the perturbation regime. HHG, which was initially observed in gaseous media, has recently been demonstrated in solid-state materials. Determining how to control such extreme nonlinear optical phenomena is a challenging subject. Here, we demonstrate the control of HHG through tuning the electronic structure and carrier injection using single-walled carbon nanotubes (SWCNTs). We reveal systematic changes in the high-harmonic spectra of SWCNTs with a series of electronic structures ranging from a metal structure to a semiconductor structure. We demonstrate enhancement or reduction of harmonic generation by more than 1 order of magnitude by tuning the electron and hole injection into the semiconductor SWCNTs through electrolyte gating. These results open a path toward the control of HHG in the context of field-effect transistor devices.
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Affiliation(s)
- Hiroyuki Nishidome
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Kohei Nagai
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kento Uchida
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Yota Ichinose
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yohei Yomogida
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Koichiro Tanaka
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Institute for Integrated Cell-Material Science (WPI-iCeMs), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuhiro Yanagi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Taniguchi T, Nurdiwijayanto L, Li S, Lim HE, Miyata Y, Lu X, Ma R, Tang DM, Ueda S, Tsukagoshi K, Sasaki T, Osada M. On/Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS 2. ACS Nano 2020; 14:6663-6672. [PMID: 32396324 DOI: 10.1021/acsnano.9b09253] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Molecularly thin two-dimensional (2D) semiconductors are emerging as photocatalysts owing to their layer-number-dependent quantum effects and high charge separation efficiency. However, the correlation among the dimensionality, crystallinity, and photocatalytic activity of such 2D nanomaterials remains unclear. Herein, a Ag photoreduction technique coupled with microscopic analyses is employed to spatially resolve the photocatalytic activity of MoS2 as a model catalyst. Interestingly, we find that only monolayer (1L)-MoS2 is active for a Ag photoreduction reaction. The photocatalytic activity of 1L-MoS2 is enhanced by a built-in electrical field originated from the MoS2/SiO2 interface, instead of by the specific surface structure and quantum electronic state of 1L-MoS2. Furthermore, we observe photocatalytic active sites to be geometrically distributed on triangular 1L-MoS2 crystals, wherein the Ag particles are preferentially deposited on the outermost zigzag edges and defective inner parts of the triangular grains. The degradation of photocatalytic activity and electron mobility with the formation of Mo(VI) species indicates that the species inhibit the in-plane diffusion of the photogenerated electrons to the reductive sites. The monolayer-selectivity, activation, and inactivation mechanisms, unveiled in this work, will offer future directions in designing 2D nanophotocatalysts.
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Affiliation(s)
- Takaaki Taniguchi
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Leanddas Nurdiwijayanto
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Shisheng Li
- International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Hong En Lim
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Xueyi Lu
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Renzhi Ma
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Dang-Ming Tang
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Shigenori Ueda
- Synchrotron X-ray Station at SPring-8, National Institute for Materials Science (NIMS), 1-1-1 Sayo, Hyogo 679-5148, Japan
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Kazuhito Tsukagoshi
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Takayoshi Sasaki
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Minoru Osada
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Institute of Materials and Systems for Sustainability, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8603, Japan
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34
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Xiang R, Inoue T, Zheng Y, Kumamoto A, Qian Y, Sato Y, Liu M, Tang D, Gokhale D, Guo J, Hisama K, Yotsumoto S, Ogamoto T, Arai H, Kobayashi Y, Zhang H, Hou B, Anisimov A, Maruyama M, Miyata Y, Okada S, Chiashi S, Li Y, Kong J, Kauppinen EI, Ikuhara Y, Suenaga K, Maruyama S. One-dimensional van der Waals heterostructures. Science 2020; 367:537-542. [PMID: 32001649 DOI: 10.1126/science.aaz2570] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 12/10/2019] [Indexed: 01/18/2023]
Abstract
We present the experimental synthesis of one-dimensional (1D) van der Waals heterostructures, a class of materials where different atomic layers are coaxially stacked. We demonstrate the growth of single-crystal layers of hexagonal boron nitride (BN) and molybdenum disulfide (MoS2) crystals on single-walled carbon nanotubes (SWCNTs). For the latter, larger-diameter nanotubes that overcome strain effect were more readily synthesized. We also report a 5-nanometer-diameter heterostructure consisting of an inner SWCNT, a middle three-layer BN nanotube, and an outer MoS2 nanotube. Electron diffraction verifies that all shells in the heterostructures are single crystals. This work suggests that all of the materials in the current 2D library could be rolled into their 1D counterparts and a plethora of function-designable 1D heterostructures could be realized.
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Affiliation(s)
- Rong Xiang
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
| | - Taiki Inoue
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yongjia Zheng
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Akihito Kumamoto
- Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yang Qian
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yuta Sato
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Ming Liu
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Daiming Tang
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Japan
| | - Devashish Gokhale
- Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Jia Guo
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.,College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Kaoru Hisama
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Satoshi Yotsumoto
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Tatsuro Ogamoto
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Hayato Arai
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yu Kobayashi
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Hao Zhang
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Bo Hou
- Energy NanoEngineering Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan
| | | | - Mina Maruyama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Susumu Okada
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Shohei Chiashi
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yan Li
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.,College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jing Kong
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Esko I Kauppinen
- Department of Applied Physics, Aalto University School of Science, Espoo 15100, FI-00076 Aalto, Finland
| | - Yuichi Ikuhara
- Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan
| | - Kazu Suenaga
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Shigeo Maruyama
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan. .,Energy NanoEngineering Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan
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35
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Takahashi Y, Kobayashi Y, Wang Z, Ito Y, Ota M, Ida H, Kumatani A, Miyazawa K, Fujita T, Shiku H, Korchev YE, Miyata Y, Fukuma T, Chen M, Matsue T. High-Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition-Metal Dichalcogenide Nanosheets. Angew Chem Int Ed Engl 2020; 59:3601-3608. [PMID: 31777142 DOI: 10.1002/anie.201912863] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Indexed: 11/10/2022]
Abstract
High-resolution scanning electrochemical cell microscopy (SECCM) is used to image and quantitatively analyze the hydrogen evolution reaction (HER) catalytically active sites of 1H-MoS2 nanosheets, MoS2 , and WS2 heteronanosheets. Using a 20 nm radius nanopipette and hopping mode scanning, the resolution of SECCM was beyond the optical microscopy limit and visualized a small triangular MoS2 nanosheet with a side length of ca. 130 nm. The electrochemical cell provides local cyclic voltammograms with a nanoscale spatial resolution for visualizing HER active sites as electrochemical images. The HER activity difference of edge, terrace, and heterojunction of MoS2 and WS2 were revealed. The SECCM imaging directly visualized the relationship of HER activity and number of MoS2 nanosheet layers and unveiled the heterogeneous aging state of MoS2 nanosheets. SECCM can be used for improving local HER activities by producing sulfur vacancies using electrochemical reaction at the selected region.
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Affiliation(s)
- Yasufumi Takahashi
- WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.,Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan
| | - Yu Kobayashi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Ziqian Wang
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Yoshikazu Ito
- Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan.,Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan
| | - Masato Ota
- WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Hiroki Ida
- Graduate School of Environmental Studies, Tohoku University, 6-6-11-604, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan
| | - Akichika Kumatani
- Graduate School of Environmental Studies, Tohoku University, 6-6-11-604, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan.,WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, 2-1-1-509, Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Keisuke Miyazawa
- WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Takeshi Fujita
- School of Environmental Science and Engineering, Kochi University of Technology, Kochi, 782-8502, Japan
| | - Hitoshi Shiku
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
| | - Yuri E Korchev
- WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.,Department of Medicine, Imperial College London, London, W12 0NN, UK
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Takeshi Fukuma
- WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Mingwei Chen
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA.,WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, 2-1-1-509, Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Core Research for Evolutional Science and Technology (CREST) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan
| | - Tomokazu Matsue
- Graduate School of Environmental Studies, Tohoku University, 6-6-11-604, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan.,WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, 2-1-1-509, Katahira, Aoba-ku, Sendai, 980-8577, Japan
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36
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Takahashi Y, Kobayashi Y, Wang Z, Ito Y, Ota M, Ida H, Kumatani A, Miyazawa K, Fujita T, Shiku H, Korchev YE, Miyata Y, Fukuma T, Chen M, Matsue T. High‐Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition‐Metal Dichalcogenide Nanosheets. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912863] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yasufumi Takahashi
- WPI Nano Life Science Institute (NanoLSI, WPI) Kanazawa University, Kakuma-machi Kanazawa Ishikawa 920-1192 Japan
- Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan) Science and Technology Agency (JST) Saitama 332-0012 Japan
| | - Yu Kobayashi
- Department of Physics Tokyo Metropolitan University, Hachioji Tokyo 192-0397 Japan
| | - Ziqian Wang
- Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21218 USA
| | - Yoshikazu Ito
- Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan) Science and Technology Agency (JST) Saitama 332-0012 Japan
- Institute of Applied Physics Graduate School of Pure and Applied Sciences University of Tsukuba Tsukuba Ibaraki 305-8573 Japan
| | - Masato Ota
- WPI Nano Life Science Institute (NanoLSI, WPI) Kanazawa University, Kakuma-machi Kanazawa Ishikawa 920-1192 Japan
| | - Hiroki Ida
- Graduate School of Environmental Studies Tohoku University 6-6-11-604, Aramaki Aoba Aoba-ku Sendai 980-8579 Japan
| | - Akichika Kumatani
- Graduate School of Environmental Studies Tohoku University 6-6-11-604, Aramaki Aoba Aoba-ku Sendai 980-8579 Japan
- WPI-Advanced Institute for Materials Research (AIMR) Tohoku University 2-1-1-509, Katahira Aoba-ku Sendai 980-8577 Japan
| | - Keisuke Miyazawa
- WPI Nano Life Science Institute (NanoLSI, WPI) Kanazawa University, Kakuma-machi Kanazawa Ishikawa 920-1192 Japan
| | - Takeshi Fujita
- School of Environmental Science and Engineering Kochi University of Technology Kochi 782-8502 Japan
| | - Hitoshi Shiku
- Department of Applied Chemistry Graduate School of Engineering Tohoku University Sendai 980-8579 Japan
| | - Yuri E. Korchev
- WPI Nano Life Science Institute (NanoLSI, WPI) Kanazawa University, Kakuma-machi Kanazawa Ishikawa 920-1192 Japan
- Department of Medicine Imperial College London London W12 0NN UK
| | - Yasumitsu Miyata
- Department of Physics Tokyo Metropolitan University, Hachioji Tokyo 192-0397 Japan
| | - Takeshi Fukuma
- WPI Nano Life Science Institute (NanoLSI, WPI) Kanazawa University, Kakuma-machi Kanazawa Ishikawa 920-1192 Japan
| | - Mingwei Chen
- Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21218 USA
- WPI-Advanced Institute for Materials Research (AIMR) Tohoku University 2-1-1-509, Katahira Aoba-ku Sendai 980-8577 Japan
- Core Research for Evolutional Science and Technology (CREST) (Japan) Science and Technology Agency (JST) Saitama 332-0012 Japan
| | - Tomokazu Matsue
- Graduate School of Environmental Studies Tohoku University 6-6-11-604, Aramaki Aoba Aoba-ku Sendai 980-8579 Japan
- WPI-Advanced Institute for Materials Research (AIMR) Tohoku University 2-1-1-509, Katahira Aoba-ku Sendai 980-8577 Japan
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37
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Endo K, Miyata Y, Irisawa T. The 2D Materials Used for Nanodevice Applications: Utilizing Aggressively Scaled Transistors. IEEE Nanotechnology Mag 2019. [DOI: 10.1109/mnano.2019.2941030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Okada M, Okada N, Chang WH, Endo T, Ando A, Shimizu T, Kubo T, Miyata Y, Irisawa T. Gas-Source CVD Growth of Atomic Layered WS 2 from WF 6 and H 2S Precursors with High Grain Size Uniformity. Sci Rep 2019; 9:17678. [PMID: 31776373 PMCID: PMC6881408 DOI: 10.1038/s41598-019-54049-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 11/07/2019] [Indexed: 11/18/2022] Open
Abstract
Two-dimensional (2D) transition-metal dichalcogenides have attracted a considerable amount of attention because of their potential for post-silicon device applications, as well as for exploring fundamental physics in an ideal 2D system. We tested the chemical vapour deposition (CVD) of WS2 using the gaseous precursors WF6 and H2S, augmented by the Na-assistance method. When Na was present during growth, the process created triangle-shaped WS2 crystals that were 10 μm in size and exhibited semiconducting characteristics. By contrast, the Na-free growth of WS2 resulted in a continuous film with metallic behaviour. These results clearly demonstrate that alkali-metal assistance is valid even in applications of gas-source CVD without oxygen-containing species, where intermediates comprising Na, W, and S can play an important role. We observed that the WS2 crystals grown by gas-source CVD exhibited a narrow size distribution when compared with crystals grown by conventional solid-source CVD, indicating that the crystal nucleation occurred almost simultaneously across the substrate, and that uniform lateral growth was dominant afterwards. This phenomenon was attributed to the suppression of inhomogeneous nucleation through the fast and uniform diffusion of the gas-phase precursors, supported by the Na-assisted suppression of the fast reactions between WF6 and H2S.
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Affiliation(s)
- Mitsuhiro Okada
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
| | - Naoya Okada
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
| | - Wen-Hsin Chang
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-Osawa, Hachioji, Tokyo, 192-0397, Japan
| | - Atsushi Ando
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
| | - Tetsuo Shimizu
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Toshitaka Kubo
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-Osawa, Hachioji, Tokyo, 192-0397, Japan
| | - Toshifumi Irisawa
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8568, Japan.
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39
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Lim HE, Irisawa T, Okada N, Okada M, Endo T, Nakanishi Y, Maniwa Y, Miyata Y. Monolayer MoS 2 growth at the Au-SiO 2 interface. Nanoscale 2019; 11:19700-19704. [PMID: 31460548 DOI: 10.1039/c9nr05119h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Atomically thin transition-metal dichalcogenides (TMDs) are attracting great interest for future electronic applications. Even though much effort has been devoted to preparing large-area, high-quality TMDs over the past few years, the samples are usually grown on substrate surfaces. Here, we demonstrate the direct growth of a MoS2 monolayer at the interface between a Au film and a SiO2 substrate. MoS2 grains were nucleated below Au films deposited on SiO2via interface diffusion and then grown into a continuous MoS2 film. By programming the Au pattern deposited, controlled growth of MoS2 with the desired size and geometry was achieved over preferred locations, facilitating its integration into functional field-effect transistors. Our findings elucidate the fabrication of a two-dimensional semiconductor at the interface of bulk three-dimensional solids, providing a novel means for establishing a clean interface junction. It also offers a promising alternative to the site-selective synthesis of TMDs, which is expected to aid the fabrication of TMD-based nanodevices.
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Affiliation(s)
- Hong En Lim
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
| | - Toshifumi Irisawa
- Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.
| | - Naoya Okada
- Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.
| | - Mitsuhiro Okada
- Nanomaterials Research Institute (NMRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
| | - Yutaka Maniwa
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
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40
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Taniguchi T, Li S, Nurdiwijayanto L, Kobayashi Y, Saito T, Miyata Y, Obata S, Saiki K, Yokoi H, Watanabe K, Taniguchi T, Tsukagoshi K, Ebina Y, Sasaki T, Osada M. Tunable Chemical Coupling in Two-Dimensional van der Waals Electrostatic Heterostructures. ACS Nano 2019; 13:11214-11223. [PMID: 31580052 DOI: 10.1021/acsnano.9b04256] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Heterostructures of two-dimensional (2D) atomic crystals provide fascinating molecular-scale design elements for emergent physical phenomena and functional materials, as integrating distinct monolayers into vertical heterostructures can afford coupling between disparate properties. However, the available examples have been limited to either van der Waals (vdW) or electrostatic (ES) heterostructures that are solely composed of noncharged and charged monolayers, respectively. Here, we propose a "vdW-ES heterostructure" chemical design in which charge-neutral and charged monolayer-building blocks with highly disparate chemical and physical properties are conjugated vertically through asymmetrically charged interfaces. We demonstrate vdW-ES heteroassembly of semiconducting MoS2 and dielectric Ca2Nb3O10- (CNO) monolayers using an amphipathic molecular starch, resulting in the emergence of trion luminescence observed at the lowest energy among MoS2-related materials, probably due to interfacial confinement effects given by vdW-ES dual interactions. In addition, interface engineering leads to tailored exciton of the vdW/ES heterostructures owing to the pronounced dielectric proximity effects, bringing an intriguing interlayer chemistry to modify 2D materials. Furthermore, the current approach was successfully extended to create a graphene/CNO heterostructure, which verifies the versatility of the preparative method.
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Affiliation(s)
- Takaaki Taniguchi
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Shisheng Li
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Leanddas Nurdiwijayanto
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Yu Kobayashi
- Department of Physics , Tokyo Metropolitan University , Hachioji , Tokyo 192-0397 , Japan
| | - Tetsuki Saito
- Department of Physics , Tokyo Metropolitan University , Hachioji , Tokyo 192-0397 , Japan
| | - Yasumitsu Miyata
- Department of Physics , Tokyo Metropolitan University , Hachioji , Tokyo 192-0397 , Japan
| | - Seiji Obata
- Department of Complexity Science and Engineering , Graduate School of Frontier Sciences, The University of Tokyo , Kashiwa , Chiba 277-8561 , Japan
| | - Koichiro Saiki
- Department of Complexity Science and Engineering , Graduate School of Frontier Sciences, The University of Tokyo , Kashiwa , Chiba 277-8561 , Japan
| | - Hiroyuki Yokoi
- Faculty of Advanced Science and Technology , Kumamoto University , Kumamoto 860-8555 , Japan
| | - Kenji Watanabe
- Research Center for Functional Materials , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Takashi Taniguchi
- Research Center for Functional Materials , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Kazuhito Tsukagoshi
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Yasuo Ebina
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Takayoshi Sasaki
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Minoru Osada
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science(NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
- Institute of Materials and Systems for Sustainability , Nagoya University , Furocho, Chikusa-ku, Nagoya 464-8603 , Japan
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Kagimoto A, Tsutani Y, Izaki Y, Handa Y, Mimae T, Miyata Y, Okada M. P2.17-01 Analysis of Clinical Features and Prognosis of Non-Small Cell Lung Cancer Exceeding 30 mm Depending on the Ground Glass Opacity (GGO) Ratio. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Tsutani Y, Kagimoto A, Handa Y, Mimae T, Miyata Y, Okada M. P1.13-13 High-Risk Clinical Stage I Non-Small Cell Lung Cancer Based on High-Resolution Computed Tomography Findings. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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43
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Fujiwara M, Tsutani Y, Mimae T, Miyata Y, Okada M. P1.17-01 Surgical Outcome of Early Stage Lung Cancer Related vs Unrelated to Honeycomb Lesions with Interstitial Pneumonia. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mimae T, Miyata Y, Tsutani Y, Imai K, Ito H, Nakayama H, Ikeda N, Okada M. Wedge resection with omission of lymph node dissection as an optional treatment strategy in octogenarians or older with early stage non-small cell lung cancers. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz258.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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45
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Ji HG, Solís-Fernández P, Yoshimura D, Maruyama M, Endo T, Miyata Y, Okada S, Ago H. Chemically Tuned p- and n-Type WSe 2 Monolayers with High Carrier Mobility for Advanced Electronics. Adv Mater 2019; 31:e1903613. [PMID: 31475400 DOI: 10.1002/adma.201903613] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Monolayers of transition metal dichalcogenides (TMDCs) have attracted a great interest for post-silicon electronics and photonics due to their high carrier mobility, tunable bandgap, and atom-thick 2D structure. With the analogy to conventional silicon electronics, establishing a method to convert TMDC to p- and n-type semiconductors is essential for various device applications, such as complementary metal-oxide-semiconductor (CMOS) circuits and photovoltaics. Here, a successful control of the electrical polarity of monolayer WSe2 is demonstrated by chemical doping. Two different molecules, 4-nitrobenzenediazonium tetrafluoroborate and diethylenetriamine, are utilized to convert ambipolar WSe2 field-effect transistors (FETs) to p- and n-type, respectively. Moreover, the chemically doped WSe2 show increased effective carrier mobilities of 82 and 25 cm2 V-1 s-1 for holes and electrons, respectively, which are much higher than those of the pristine WSe2 . The doping effects are studied by photoluminescence, Raman, X-ray photoelectron spectroscopy, and density functional theory. Chemically tuned WSe2 FETs are integrated into CMOS inverters, exhibiting extremely low power consumption (≈0.17 nW). Furthermore, a p-n junction within single WSe2 grain is realized via spatially controlled chemical doping. The chemical doping method for controlling the transport properties of WSe2 will contribute to the development of TMDC-based advanced electronics.
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Affiliation(s)
- Hyun Goo Ji
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, 816-8580, Japan
| | | | | | - Mina Maruyama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki, 305-8571, Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Susumu Okada
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki, 305-8571, Japan
| | - Hiroki Ago
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, 816-8580, Japan
- Global Innovation Center (GIC), Kyushu University, Fukuoka, 816-8580, Japan
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Handa Y, Tsutani Y, Kagimoto A, Mimae T, Miyata Y, Okada M. P1.17-09 Surgical Outcomes of Complex Versus Simple Segmentectomy for Stage I Non-Small Cell Lung Cancer. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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Ito M, Miyata Y, Hirano S, Irisuna F, Kishi N, Tsutani Y, Rosell R, Okada M. MA10.11 Sensitivity and Optimal Clinicopathological Features of Genetic Targeted Liquid Biopsy in pN0M0 Lung Adenocarcinoma. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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48
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Corona D, Cruz N, Tommasi GD, Fernandes H, Joffrin E, Mattei M, Mele A, Miyata Y, Pironti A, Suzuki T, Urano H, Villone F. Plasma shape control assessment for JT-60SA using the CREATE tools. Fusion Engineering and Design 2019. [DOI: 10.1016/j.fusengdes.2019.03.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Pu J, Matsuki K, Chu L, Kobayashi Y, Sasaki S, Miyata Y, Eda G, Takenobu T. Exciton Polarization and Renormalization Effect for Optical Modulation in Monolayer Semiconductors. ACS Nano 2019; 13:9218-9226. [PMID: 31394038 DOI: 10.1021/acsnano.9b03563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The ideal quantum confinement structure of monolayer semiconductors offers prominent optical modulation capabilities that are mediated by enhanced many-body interactions. Herein, we establish an electrolyte-gating method for tuning the luminescence properties that are in transition metal dichalcogenide (TMDC) monolayers. We fabricate electric double-layer capacitors on TMDC/graphite heterostructures to investigate electric-field- and carrier-density-dependent photoluminescence. The exciton peak energy initially shows a slight quadratic red shift of ∼1 meV without carrier accumulations, which is caused by the quantum-confined Stark effect. In contrast, the exciton resonance exhibits a larger red shift up to 10 meV with the accumulated carrier density above 1013 cm-2. These results indicate that the optical transitions can be largely modulated by the carrier density control in S- and Se-based TMDCs, as triggered by the doping-induced band gap renormalization effect. To further inspire this modulation capability, we also apply our method to electrolyte-based TMDC light-emitting devices. Biasing solely in electrolyte-induced p-i-n junctions yields pronounced red shifts up to 40 meV for exciton and trion electroluminescence. Consequently, our approach reveals that the doping effects in the high-carrier-density regimes are potentially significant for efficient optical modulation in monolayer semiconductors.
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Affiliation(s)
- Jiang Pu
- Department of Applied Physics , Nagoya University , Nagoya 464-8603 , Japan
| | - Keichiro Matsuki
- Department of Advanced Science and Engineering , Waseda University , Tokyo 169-8555 , Japan
| | - Leiqiang Chu
- Department of Physics , National University of Singapore , 117551 Singapore
- Centre for Advanced 2D Materials , 117542 Singapore
| | - Yu Kobayashi
- Department of Physics , Tokyo Metropolitan University , Tokyo 192-0397 , Japan
| | - Shogo Sasaki
- Department of Physics , Tokyo Metropolitan University , Tokyo 192-0397 , Japan
| | - Yasumitsu Miyata
- Department of Physics , Tokyo Metropolitan University , Tokyo 192-0397 , Japan
| | - Goki Eda
- Department of Physics , National University of Singapore , 117551 Singapore
- Centre for Advanced 2D Materials , 117542 Singapore
- Department of Chemistry , National University of Singapore , 117542 Singapore
| | - Taishi Takenobu
- Department of Applied Physics , Nagoya University , Nagoya 464-8603 , Japan
- Department of Advanced Science and Engineering , Waseda University , Tokyo 169-8555 , Japan
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Yoshikawa N, Nagai K, Uchida K, Takaguchi Y, Sasaki S, Miyata Y, Tanaka K. Interband resonant high-harmonic generation by valley polarized electron-hole pairs. Nat Commun 2019; 10:3709. [PMID: 31420551 PMCID: PMC6697745 DOI: 10.1038/s41467-019-11697-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 07/30/2019] [Indexed: 11/09/2022] Open
Abstract
High-harmonic generation in solids is a unique tool to investigate the electron dynamics in strong light fields. The systematic study in monolayer materials is required to deepen the insight into the fundamental mechanism of high-harmonic generation. Here we demonstrated nonperturbative high harmonics up to 18th order in monolayer transition metal dichalcogenides. We found the enhancement in the even-order high harmonics which is attributed to the resonance to the band nesting energy. The symmetry analysis shows that the valley polarization and anisotropic band structure lead to polarization of the high-harmonic radiation. The calculation based on the three-step model in solids revealed that the electron-hole polarization driven to the band nesting region should contribute to the high harmonic radiation, where the electrons and holes generated at neighboring lattice sites are taken into account. Our findings open the way for attosecond science with monolayer materials having widely tunable electronic structures.
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Affiliation(s)
- Naotaka Yoshikawa
- Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan. .,Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.
| | - Kohei Nagai
- Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Kento Uchida
- Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yuhei Takaguchi
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Shogo Sasaki
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Koichiro Tanaka
- Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan. .,Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.
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