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Lee YJ, Kim Y, Gim H, Hong K, Jang HW. Nanoelectronics Using Metal-Insulator Transition. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2305353. [PMID: 37594405 DOI: 10.1002/adma.202305353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 08/02/2023] [Indexed: 08/19/2023]
Abstract
Metal-insulator transition (MIT) coupled with an ultrafast, significant, and reversible resistive change in Mott insulators has attracted tremendous interest for investigation into next-generation electronic and optoelectronic devices, as well as a fundamental understanding of condensed matter systems. Although the mechanism of MIT in Mott insulators is still controversial, great efforts have been made to understand and modulate MIT behavior for various electronic and optoelectronic applications. In this review, recent progress in the field of nanoelectronics utilizing MIT is highlighted. A brief introduction to the physics of MIT and its underlying mechanisms is begun. After discussing the MIT behaviors of various Mott insulators, recent advances in the design and fabrication of nanoelectronics devices based on MIT, including memories, gas sensors, photodetectors, logic circuits, and artificial neural networks are described. Finally, an outlook on the development and future applications of nanoelectronics utilizing MIT is provided. This review can serve as an overview and a comprehensive understanding of the design of MIT-based nanoelectronics for future electronic and optoelectronic devices.
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Affiliation(s)
- Yoon Jung Lee
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
| | - Youngmin Kim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hyeongyu Gim
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Kootak Hong
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
- Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea
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2
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Mutilin SV, Yakovkina LV, Seleznev VA, Prinz VY. Kinetics of Catalyst-Free and Position-Controlled Low-Pressure Chemical Vapor Deposition Growth of VO 2 Nanowire Arrays on Nanoimprinted Si Substrates. MATERIALS (BASEL, SWITZERLAND) 2022; 15:ma15217863. [PMID: 36363453 PMCID: PMC9656171 DOI: 10.3390/ma15217863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 10/30/2022] [Accepted: 11/06/2022] [Indexed: 05/27/2023]
Abstract
In the present article, the position-controlled and catalytic-free synthesis of vanadium dioxide (VO2) nanowires (NWs) grown by the chemical vapor deposition (CVD) on nanoimprinted silicon substrates in the form of nanopillar arrays was analyzed. The NW growth on silicon nanopillars with different cross-sectional areas was studied, and it has been shown that the NWs' height decreases with an increase in their cross-sectional area. The X-ray diffraction technique, scanning electron microscopy, and X-ray photoelectron spectroscopy showed the high quality of the grown VO2 NWs. A qualitative description of the growth rate of vertical NWs based on the material balance equation is given. The dependence of the growth rate of vertical and horizontal NWs on the precursor concentration in the gas phase and on the growth time was investigated. It was found that the height of vertical VO2 NWs along the [100] direction exhibited a linear dependence on time and increased with an increase in the precursor concentration. For horizontal VO2 NWs, the height along the direction [011] varied little with the growth time and precursor concentration. These results suggest that the high-aspect ratio vertical VO2 NWs formed due to different growth modes of their crystal faces forming the top of the growing VO2 crystals and their lateral crystal faces related to the difference between the free energies of these crystal faces and implemented experimental conditions. The results obtained permit a better insight into the growth of high-aspect ratio VO2 NWs and into the formation of large VO2 NW arrays with a controlled composition and properties.
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Affiliation(s)
- Sergey V. Mutilin
- Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev Aven., 630090 Novosibirsk, Russia
| | - Lyubov V. Yakovkina
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev Aven., 630090 Novosibirsk, Russia
| | - Vladimir A. Seleznev
- Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev Aven., 630090 Novosibirsk, Russia
| | - Victor Ya. Prinz
- Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev Aven., 630090 Novosibirsk, Russia
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Huang J, Zhou Y, Liu Y, Lai Z, Zhou F, Zhu J. First-principles study of H 2S sensing mechanism on the Pd/VO 2 surface. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1900941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Jingtao Huang
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Yi Zhou
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Yong Liu
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Zhonghong Lai
- Analysis and Testing Center, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Fei Zhou
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Jingchuan Zhu
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, People's Republic of China
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4
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Lin L, Chen R, Huang J, Wang P, Tao H, Zhang Z. Adsorption of gas molecules of CH 4, CO and H 2O on the vanadium dioxide monolayer: computational method and model. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 33:055502. [PMID: 32998128 DOI: 10.1088/1361-648x/abbcfa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
Inspired by the recent use of two-dimensional nanomaterials as gas sensors, we used density functional theory calculations to study the adsorption of gas molecules (CH4, CO and H2O) on sandwich vanadium dioxide tablets. The results showed that of all these gases, only the CH4gas molecule was the electron acceptor with significant charge transfer on the VO2sheet. The adsorption energies of CH4, CO and H2O are -229.5 meV, -239.1 meV and -388.3 meV, respectively. We have also compared the adsorption energy of three different gas molecules on the VO2surface, our calculation results show that when the three kinds of gases are adsorbed on the VO2surface, the order of the surface adsorption energy is H2O > CO > CH4. It is also found that after adsorption of CH4, CO and H2O molecules, the electronic properties of VO2sheet changed obviously. However, due to the strong adsorption of H2O molecule on VO2sheet, it is difficult to desorption, which hinders its application in gas molecular sensors. The optical properties of VO2sheet are further calculated. The absorption of CH4, CO and H2O molecules is introduced to red-shift the dielectric function of the thin film, which indicates that the optical properties of the thin film have changed significantly. According to the change of optical properties of VO2sheet before and after molecular adsorption, VO2can be used as a highly selective optical gas sensor for CH4, CO and H2O detection. These results provide a new approach for the potential application of VO2based optical gas sensors.
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Affiliation(s)
- Long Lin
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan Province, People's Republic of China
- School of Mathematics and Informatics, Henan Polytechnic University, Jiaozuo 454000, China
| | - Ruixin Chen
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan Province, People's Republic of China
| | - Jingtao Huang
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, Heilongjiang Province, People's Republic of China
| | - Pengtao Wang
- School of Material Science and Engineering, Shaanxi University of Science and Technology, Shaanxi 710021, China
| | - Hualong Tao
- Liaoning Key Materials Laboratory for Railway, School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, People's Republic of China
| | - Zhanying Zhang
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan Province, People's Republic of China
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Rashid MA, Mondal BK, Rubel MHK, Rahman MM, Mefford OT, Hossain J. Synthesis of Self-Assembled Randomly Oriented VO 2 Nanowires on a Glass Substrate by a Spin Coating Method. Inorg Chem 2020; 59:15707-15716. [PMID: 33078925 DOI: 10.1021/acs.inorgchem.0c02108] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Randomly oriented vanadium dioxide (VO2) nanowires were produced on a glass substrate by spin coating from a cosolvent. SEM studies reveal that highly dense VO2 nanowires were grown at an annealing temperature of 400 °C. X-ray diffraction (XRD) provides evidence of the high crystallinity of the VO2 nanowires-embedded VO2 thin films on the glass substrate at 400 °C. Characterization by high-resolution transmission electron microscopy (HR-TEM) confirmed the formation of VO2 nanowires. The optical band gap of the nanowires-embedded VO2 thin films was also calculated from the transmittance data to be 2.65-2.70 eV. The growth mechanism of the solution-processed semiconducting VO2 nanowires was proposed based on both solvent selection and annealing temperature. Finally, the solar water splitting ability of the VO2 nanowires-embedded VO2 thin films was demonstrated in a photoelectrochemical cell (PEC).
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Affiliation(s)
- Md Abdur Rashid
- Solar Energy Laboratory, Department of Electrical and Electronic Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh.,Department of Physics, University of Rajshahi, Rajshahi 6205, Bangladesh
| | - Bipanko Kumar Mondal
- Solar Energy Laboratory, Department of Electrical and Electronic Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh
| | - Mirza H K Rubel
- Department of Materials Science and Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh
| | - Md Mahbubor Rahman
- Department of Chemistry, University of Rajshahi, Rajshahi 6205, Bangladesh.,Department of Materials Science & Engineering, Clemson University, Clemson, South Carolina 29634-0971, United States
| | - Olin Thompson Mefford
- Department of Materials Science & Engineering, Clemson University, Clemson, South Carolina 29634-0971, United States
| | - Jaker Hossain
- Solar Energy Laboratory, Department of Electrical and Electronic Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh
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Alam M, Uddin M, Asiri AM, Rahman MM, Islam M. Development of reproducible thiourea sensor with binary SnO2/V2O5 nanomaterials by electrochemical method. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.03.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Park J, Yoon H, Sim H, Choi SY, Son J. Accelerated Hydrogen Diffusion and Surface Exchange by Domain Boundaries in Epitaxial VO 2 Thin Films. ACS NANO 2020; 14:2533-2541. [PMID: 32040301 DOI: 10.1021/acsnano.0c00441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electronic phase modulation based on hydrogen insertion/extraction is kinetically limited by the bulk hydrogen diffusion or surface exchange reaction, so slow hydrogen kinetics has been a fundamental challenge to be solved for realizing faster solid-state electrochemical switching devices. Here we accelerate electronic phase modulation that occurs by hydrogen insertion in VO2 through vertically aligned 2D defects induced by symmetry mismatch between epitaxial films and substrates. By using domain-matching epitaxial growth of monoclinic VO2 films with lattice rotation and twinning on hexagonal Al2O3 substrates, the domain boundaries naturally align vertically; they provide a "highway" for hydrogen diffusion and surface exchange in VO2 films and overcome the limited rates of bulk diffusion and surface reaction. From the quantitative analysis of the deuterium (2H) isotope tracer exchange, it is confirmed that the tracer diffusion coefficient (D*) and surface exchange coefficient (k*) were increased by several orders of magnitude in VO2 films that had domain boundaries. These results yield fundamental insights into the mechanism by which mobile ions are inserted along extended defects and provide a strategy to overcome a limitation to switching speed in electrochemical devices that exploit ion insertion.
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Affiliation(s)
- Jaeseoung Park
- Department of Materials Science and Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , Republic of Korea
| | - Hyojin Yoon
- Department of Materials Science and Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , Republic of Korea
| | - Hyeji Sim
- Department of Materials Science and Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , Republic of Korea
| | - Si-Young Choi
- Department of Materials Science and Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , Republic of Korea
| | - Junwoo Son
- Department of Materials Science and Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , Republic of Korea
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8
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Panagopoulou M, Vernardou D, Koudoumas E, Tsoukalas D, Raptis YS. Tungsten doping effect on V2O5 thin film electrochromic performance. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134743] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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9
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Hong KT, Moon CW, Suh JM, Lee TH, Kim SI, Lee S, Jang HW. Daylight-Induced Metal-Insulator Transition in Ag-Decorated Vanadium Dioxide Nanorod Arrays. ACS APPLIED MATERIALS & INTERFACES 2019; 11:11568-11578. [PMID: 30834745 DOI: 10.1021/acsami.8b19490] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metal-insulator transition (MIT) in strongly correlated electronic materials has enormous potential with scientific and technological impacts in future oxide nanoelectronic devices. Although photo-induced MIT can provide opportunities to extend the novel functionality of strongly correlated electronic materials, there have rarely been reports on it. Here, we report MIT provoked by visible-near-infrared light in Ag-decorated VO2 nanorod arrays (NRs) because of localized surface plasmon resonance (LSPR) and its application to broadband photodetectors. Our simulation results based on the finite-difference time-domain method show that the electric field resulting from LSPR can be generated at the interface between Ag nanoparticles and VO2 layers under vis NIR illumination. Using high-resolution transmission electronic microscopy and Raman spectroscopy, we observe the MIT and structural phase transition in the Ag-decorated VO2 NRs due to the LSPR effect. The optoelectronic measurements confirm that high, fast, and broad photoresponse of Ag-decorated VO2 NRs is attributed to photo-induced MIT due to LSPR. Our study will open up a new strategy to trigger MIT in strongly correlated electronic materials through functionalization with plasmonic nanoparticles and serve as a valuable proof of concept for next-generation optoelectronic devices with fast response, low power consumption, and high performance.
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Affiliation(s)
- Koo Tak Hong
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Cheon Woo Moon
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Jun Min Suh
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Tae Hyung Lee
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Seong-Il Kim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Sanghan Lee
- School of Materials Science and Engineering , Gwangju Institute of Science and Technology , Gwangju 61005 , Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
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10
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Carbon dots on V2O5 nanowires are a viable peroxidase mimic for colorimetric determination of hydrogen peroxide and glucose. Mikrochim Acta 2019; 186:234. [DOI: 10.1007/s00604-019-3344-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/27/2019] [Indexed: 01/10/2023]
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11
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Hu W, Wan L, Jian Y, Ren C, Jin K, Su X, Bai X, Haick H, Yao M, Wu W. Electronic Noses: From Advanced Materials to Sensors Aided with Data Processing. ADVANCED MATERIALS TECHNOLOGIES 2018:1800488. [DOI: 10.1002/admt.201800488] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Affiliation(s)
- Wenwen Hu
- School of Aerospace Science and TechnologyXidian University Shaanxi 710126 P. R. China
| | - Liangtian Wan
- The Key Laboratory for Ubiquitous Network and Service Software of Liaoning ProvinceSchool of SoftwareDalian University of Technology Dalian 116620 China
| | - Yingying Jian
- School of Advanced Materials and NanotechnologyXidian University Shaanxi 710126 P. R. China
| | - Cong Ren
- School of Advanced Materials and NanotechnologyXidian University Shaanxi 710126 P. R. China
| | - Ke Jin
- School of Aerospace Science and TechnologyXidian University Shaanxi 710126 P. R. China
| | - Xinghua Su
- School of Materials Science and EngineeringChang'an University Xi'an 710061 China
| | - Xiaoxia Bai
- School of Advanced Materials and NanotechnologyXidian University Shaanxi 710126 P. R. China
| | - Hossam Haick
- School of Advanced Materials and NanotechnologyXidian University Shaanxi 710126 P. R. China
- Department of Chemical Engineering and Russell Berrie Nanotechnology InstituteTechnion‐Israel Institute of Technology Haifa 3200003 Israel
| | - Mingshui Yao
- Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fuzhou 350002 P. R. China
| | - Weiwei Wu
- School of Advanced Materials and NanotechnologyXidian University Shaanxi 710126 P. R. China
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Chun SH, Kim HY, Jang H, Lee Y, Jo A, Lee NS, Yu HK, Lee Y, Kim MH, Lee C. A facile growth process of highly single crystalline Ir1−xVxO2 mixed metal oxide nanorods and their electrochemical properties. CrystEngComm 2017. [DOI: 10.1039/c7ce00637c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Zhang MQ, Zhao YX, Liu QY, Li XN, He SG. Does Each Atom Count in the Reactivity of Vanadia Nanoclusters? J Am Chem Soc 2016; 139:342-347. [DOI: 10.1021/jacs.6b10839] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mei-Qi Zhang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Yan-Xia Zhao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Qing-Yu Liu
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Xiao-Na Li
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Sheng-Gui He
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
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14
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Wu H, Fu Q, Bao X. In situ Raman spectroscopy study of metal-enhanced hydrogenation and dehydrogenation of VO2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:434003. [PMID: 27603090 DOI: 10.1088/0953-8984/28/43/434003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Vanadium dioxide (VO2) has a phase transition from insulator to metal at 340 K, and this transition can be strongly modified by hydrogenation. In this work, two dimensional (2D) VO2 sheets have been grown on Si(1 1 1) surfaces through chemical vapor deposition, and metal (Au, Pt) thin films were deposited on VO2 surfaces by sputtering. The hydrogenation and dehydrogenation of VO2 and metal-decorated VO2 structures in H2 and in air were in situ studied by Raman. We found that hydrogenation and dehydrogenation temperatures have been significantly decreased with the VO2 surface decorated by Au and Pt. The enhanced hydrogenation and dehydrogenation reactions can be attributed to catalytic dissociation of H2 and O2 molecules on metal surfaces and subsequent spillover of dissociated H and O atoms to the oxide surfaces.
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Affiliation(s)
- Hao Wu
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
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15
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Woo HS, Na CW, Lee JH. Design of Highly Selective Gas Sensors via Physicochemical Modification of Oxide Nanowires: Overview. SENSORS 2016; 16:s16091531. [PMID: 27657076 PMCID: PMC5038804 DOI: 10.3390/s16091531] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 09/09/2016] [Accepted: 09/16/2016] [Indexed: 02/04/2023]
Abstract
Strategies for the enhancement of gas sensing properties, and specifically the improvement of gas selectivity of metal oxide semiconductor nanowire (NW) networks grown by chemical vapor deposition and thermal evaporation, are reviewed. Highly crystalline NWs grown by vapor-phase routes have various advantages, and thus have been applied in the field of gas sensors over the years. In particular, n-type NWs such as SnO2, ZnO, and In2O3 are widely studied because of their simple synthetic preparation and high gas response. However, due to their usually high responses to C2H5OH and NO2, the selective detection of other harmful and toxic gases using oxide NWs remains a challenging issue. Various strategies—such as doping/loading of noble metals, decorating/doping of catalytic metal oxides, and the formation of core–shell structures—have been explored to enhance gas selectivity and sensitivity, and are discussed herein. Additional methods such as the transformation of n-type into p-type NWs and the formation of catalyst-doped hierarchical structures by branch growth have also proven to be promising for the enhancement of gas selectivity. Accordingly, the physicochemical modification of oxide NWs via various methods provides new strategies to achieve the selective detection of a specific gas, and after further investigations, this approach could pave a new way in the field of NW-based semiconductor-type gas sensors.
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Affiliation(s)
- Hyung-Sik Woo
- Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea.
| | - Chan Woong Na
- Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea.
| | - Jong-Heun Lee
- Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea.
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16
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Fan G, Jiao W, Yang L, Wu X, Chen M, Gao R, Li Y, Xie B, Liu J, Han M, Song Y, Qu S. Effects of hydriding and ageing of Pd nanoparticles to contact between nanoparticles and quartz and contacts among nanoparticles investigated by the pump-probe technique. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.08.074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Optoelectronic and Electrochemical Properties of Vanadium Pentoxide Nanowires Synthesized by Vapor-Solid Process. NANOMATERIALS 2016; 6:nano6080140. [PMID: 28335268 PMCID: PMC5224621 DOI: 10.3390/nano6080140] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/11/2016] [Accepted: 07/19/2016] [Indexed: 11/22/2022]
Abstract
Substantial synthetic vanadium pentoxide (V2O5) nanowires were successfully produced by a vapor-solid (VS) method of thermal evaporation without using precursors as nucleation sites for single crystalline V2O5 nanowires with a (110) growth plane. The micromorphology and microstructure of V2O5 nanowires were analyzed by scanning electron microscope (SEM), energy-dispersive X-ray spectroscope (EDS), transmission electron microscope (TEM) and X-ray diffraction (XRD). The spiral growth mechanism of V2O5 nanowires in the VS process is proved by a TEM image. The photo-luminescence (PL) spectrum of V2O5 nanowires shows intrinsic (410 nm and 560 nm) and defect-related (710 nm) emissions, which are ascribable to the bound of inter-band transitions (V 3d conduction band to O 2p valence band). The electrical resistivity could be evaluated as 64.62 Ω·cm via four-point probe method. The potential differences between oxidation peak and reduction peak are 0.861 V and 0.470 V for the first and 10th cycle, respectively.
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Ibrahim RK, Hayyan M, AlSaadi MA, Hayyan A, Ibrahim S. Environmental application of nanotechnology: air, soil, and water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:13754-88. [PMID: 27074929 DOI: 10.1007/s11356-016-6457-z] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 03/09/2016] [Indexed: 05/17/2023]
Abstract
Global deterioration of water, soil, and atmosphere by the release of toxic chemicals from the ongoing anthropogenic activities is becoming a serious problem throughout the world. This poses numerous issues relevant to ecosystem and human health that intensify the application challenges of conventional treatment technologies. Therefore, this review sheds the light on the recent progresses in nanotechnology and its vital role to encompass the imperative demand to monitor and treat the emerging hazardous wastes with lower cost, less energy, as well as higher efficiency. Essentially, the key aspects of this account are to briefly outline the advantages of nanotechnology over conventional treatment technologies and to relevantly highlight the treatment applications of some nanomaterials (e.g., carbon-based nanoparticles, antibacterial nanoparticles, and metal oxide nanoparticles) in the following environments: (1) air (treatment of greenhouse gases, volatile organic compounds, and bioaerosols via adsorption, photocatalytic degradation, thermal decomposition, and air filtration processes), (2) soil (application of nanomaterials as amendment agents for phytoremediation processes and utilization of stabilizers to enhance their performance), and (3) water (removal of organic pollutants, heavy metals, pathogens through adsorption, membrane processes, photocatalysis, and disinfection processes).
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Affiliation(s)
- Rusul Khaleel Ibrahim
- Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Maan Hayyan
- Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia.
- University of Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, 50603, Kuala Lumpur, Malaysia.
| | - Mohammed Abdulhakim AlSaadi
- University of Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, 50603, Kuala Lumpur, Malaysia
- Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Adeeb Hayyan
- University of Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, 50603, Kuala Lumpur, Malaysia
- Department of Chemical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Shaliza Ibrahim
- Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
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19
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Quackenbush NF, Paik H, Woicik JC, Arena DA, Schlom DG, Piper LFJ. X-Ray Spectroscopy of Ultra-Thin Oxide/Oxide Heteroepitaxial Films: A Case Study of Single-Nanometer VO2/TiO2. MATERIALS 2015; 8:5452-5466. [PMID: 28793516 PMCID: PMC5455529 DOI: 10.3390/ma8085255] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 08/12/2015] [Accepted: 08/14/2015] [Indexed: 11/23/2022]
Abstract
Epitaxial ultra-thin oxide films can support large percent level strains well beyond their bulk counterparts, thereby enabling strain-engineering in oxides that can tailor various phenomena. At these reduced dimensions (typically < 10 nm), contributions from the substrate can dwarf the signal from the epilayer, making it difficult to distinguish the properties of the epilayer from the bulk. This is especially true for oxide on oxide systems. Here, we have employed a combination of hard X-ray photoelectron spectroscopy (HAXPES) and angular soft X-ray absorption spectroscopy (XAS) to study epitaxial VO2/TiO2 (100) films ranging from 7.5 to 1 nm. We observe a low-temperature (300 K) insulating phase with evidence of vanadium-vanadium (V-V) dimers and a high-temperature (400 K) metallic phase absent of V-V dimers irrespective of film thickness. Our results confirm that the metal insulator transition can exist at atomic dimensions and that biaxial strain can still be used to control the temperature of its transition when the interfaces are atomically sharp. More generally, our case study highlights the benefits of using non-destructive XAS and HAXPES to extract out information regarding the interfacial quality of the epilayers and spectroscopic signatures associated with exotic phenomena at these dimensions.
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Affiliation(s)
- Nicholas F Quackenbush
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA.
| | - Hanjong Paik
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
| | - Joseph C Woicik
- Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Dario A Arena
- National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, NY 11973, USA.
| | - Darrell G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY 14853, USA.
| | - Louis F J Piper
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA.
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20
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Wang J, Rathi S, Singh B, Lee I, Joh HI, Kim GH. Alternating Current Dielectrophoresis Optimization of Pt-Decorated Graphene Oxide Nanostructures for Proficient Hydrogen Gas Sensor. ACS APPLIED MATERIALS & INTERFACES 2015; 7:13768-13775. [PMID: 26042360 DOI: 10.1021/acsami.5b01329] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Alternating current dielectrophoresis (DEP) is an excellent technique to assemble nanoscale materials. For efficient DEP, the optimization of the key parameters like peak-to-peak voltage, applied frequency, and processing time is required for good device. In this work, we have assembled graphene oxide (GO) nanostructures mixed with platinum (Pt) nanoparticles between the micro gap electrodes for a proficient hydrogen gas sensors. The Pt-decorated GO nanostructures were well located between a pair of prepatterned Ti/Au electrodes by controlling the DEP technique with the optimized parameters and subsequently thermally reduced before sensing. The device fabricated using the DEP technique with the optimized parameters showed relatively high sensitivity (∼10%) to 200 ppm hydrogen gas at room temperature. The results indicates that the device could be used in several industry applications, such as gas storage and leak detection.
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Affiliation(s)
- Jianwei Wang
- †Samsung-SKKU Graphene Center, Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea
- #School of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang 550002, China
| | - Servin Rathi
- †Samsung-SKKU Graphene Center, Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Budhi Singh
- †Samsung-SKKU Graphene Center, Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Inyeal Lee
- †Samsung-SKKU Graphene Center, Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Han-Ik Joh
- §Institute of Advanced Composite Materials, Korea Institute of Science and Technology 864-9, Dunsan-ri, Bongdong-eup, Wanju-gun, Jeollabukdo 565-902, Republic of Korea
| | - Gil-Ho Kim
- †Samsung-SKKU Graphene Center, Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea
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21
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Dey KK, Bhatnagar D, Srivastava AK, Wan M, Singh S, Yadav RR, Yadav BC, Deepa M. VO₂ nanorods for efficient performance in thermal fluids and sensors. NANOSCALE 2015; 7:6159-6172. [PMID: 25773921 DOI: 10.1039/c4nr06032f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
VO2 (B) nanorods with average width ranging between 50-100 nm are synthesized via a hydrothermal method and the post hydrothermal treatment drying temperature is found to be influential in their overall phase and growth morphology evolution. The nanorods with unusually high optical bandgap for a VO2 material are effective in enhancing the thermal performance of ethylene glycol nanofluids over a wide temperature range as is indicated by the temperature dependent thermal conductivity measurements. Humidity and LPG sensors fabricated using the VO2 (B) nanorods bear testament to their efficient sensing performance, which can be partially attributed to the mesoporous nature of the nanorods.
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Affiliation(s)
- Kajal Kumar Dey
- National Physical Laboratory, Dr K. S. Krishnan Road, New Delhi-110012, India.
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22
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Choi SW, Katoch A, Kim JH, Kim SS. Remarkable improvement of gas-sensing abilities in p-type oxide nanowires by local modification of the hole-accumulation layer. ACS APPLIED MATERIALS & INTERFACES 2015; 7:647-52. [PMID: 25514058 DOI: 10.1021/am5068222] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
This paper proposes a method for improving the reducing or oxidizing gas-sensing abilities of p-type oxide nanowires (NWs) by locally modifying the hole-accumulation channel through the attachment of p-type nanoparticles (NPs) with different upper valence band levels. In this study, the sensing behaviors of p-CuO NWs functionalized with either p-NiO or p-Co3O4 NPs were investigated as a model materials system. The attachment of p-NiO NPs greatly improved the reducing gas-sensing performance of p-CuO NWs. In contrast, the p-Co3O4 NPs improved the oxidizing gas-sensing properties of p-CuO NWs. These results are associated with the local suppression/expansion of the hole-accumulation channel of p-CuO NWs along the radial direction due to hole flow between the NWs and NPs. The approach proposed in this study provides a guideline for fabricating sensitive chemical sensors based on p-CuO NWs.
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Affiliation(s)
- Sun-Woo Choi
- Department of Materials Science and Engineering, Inha University , Incheon 402-751, Republic of Korea
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23
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Zhong L, Li M, Wang H, Luo Y, Pan J, Li G. Star-shaped VO2 (M) nanoparticle films with high thermochromic performance. CrystEngComm 2015. [DOI: 10.1039/c5ce00873e] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Star-shaped VO2 (M) nanoparticles demonstrate adjustable phase transition temperature and excellent reversible infrared modulations in response to external voltage.
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Affiliation(s)
- Li Zhong
- Key Laboratory of Materials Physics
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031, PR China
| | - Ming Li
- Key Laboratory of Materials Physics
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031, PR China
| | - Hua Wang
- Key Laboratory of Materials Physics
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031, PR China
| | - Yuanyuan Luo
- Key Laboratory of Materials Physics
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031, PR China
| | - Jing Pan
- Key Laboratory of Materials Physics
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031, PR China
| | - Guanghai Li
- Key Laboratory of Materials Physics
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031, PR China
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24
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Rathi S, Lee IY, Park JH, Kim BJ, Kim HT, Kim GH. Postfabrication annealing effects on insulator-metal transitions in VO2 thin-film devices. ACS APPLIED MATERIALS & INTERFACES 2014; 6:19718-19725. [PMID: 25343172 DOI: 10.1021/am5046982] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In order to investigate the metal-insulator transition characteristics of VO2 devices annealed in reducing atmosphere after device fabrication at various temperature, electrical, chemical, and thermal characteristics are measured and analyzed. It is found that the sheet resistance and the insulator-metal transition point, induced by both voltage and thermal, decrease when the devices are annealed from 200 to 500 °C. The V 2p3/2 peak variation in X-ray photoelectron spectroscopy (XPS) characterization verifies the reduction of thin-films. A decrease of the transition temperature from voltage hysteresis measurements further endorse the reducing effects of the annealing on VO2 thin-film.
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Affiliation(s)
- Servin Rathi
- School of Electronic and Electrical Engineering and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University , Suwon 440-746, Korea
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25
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Chang SJ, Park JB, Lee G, Kim HJ, Lee JB, Bae TS, Han YK, Park TJ, Huh YS, Hong WK. In situ probing of doping- and stress-mediated phase transitions in a single-crystalline VO₂ nanobeam by spatially resolved Raman spectroscopy. NANOSCALE 2014; 6:8068-8074. [PMID: 24911829 DOI: 10.1039/c4nr01118j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We demonstrate an experimental in situ observation of the temperature-dependent evolution of doping- and stress-mediated structural phase transitions in an individual single-crystalline VO₂ nanobeam on a Au-coated substrate under exposure to hydrogen gas using spatially resolved Raman spectroscopy. The nucleation temperature of the rutile R structural phase in the VO₂ nanobeam upon heating under hydrogen gas was lower than that under air. The spatial structural phase evolution behavior along the length of the VO₂ nanobeam under hydrogen gas upon heating was much more inhomogeneous than that along the length of the same nanobeam under air. The triclinic T phase of the VO₂ nanobeam upon heating under hydrogen gas transformed to the R phase and this R phase was stabilized even at room temperature in air after sample cooling. In particular, after the VO₂ nanobeam with the R phase was annealed at approximately 250 °C in air, it exhibited the monoclinic M1 phase (not the T phase) at room temperature during heating and cooling cycles. These results were attributed to the interplay between hydrogen doping and stress associated with nanobeam-substrate interactions. Our study has important implications for engineering metal-insulator transition properties and developing functional devices based on VO₂ nanostructures through doping and stress.
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Affiliation(s)
- Sung-Jin Chang
- Division of Materials Science, Korea Basic Science Institute, Daejeon 305-333, Korea
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26
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Cheng C, Guo H, Amini A, Liu K, Fu D, Zou J, Song H. Self-assembly and horizontal orientation growth of VO2 nanowires. Sci Rep 2014; 4:5456. [PMID: 24965899 PMCID: PMC4071308 DOI: 10.1038/srep05456] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 06/09/2014] [Indexed: 11/09/2022] Open
Abstract
Single-crystalline vanadium dioxide (VO2) nanostructures have attracted an intense research interest recently because of their unique single-domain metal-insulator phase transition property. Synthesis of these nanostructures in the past was limited in density, alignment, or single-crystallinity. The assembly of VO2 nanowires (NWs) is desirable for a “bottom-up” approach to the engineering of intricate structures using nanoscale building blocks. Here, we report the successful synthesis of horizontally aligned VO2 NWs with a dense growth mode in the [1-100]quartz direction of a polished x-cut quartz surface using a simple vapor transport method. Our strategy of controlled growth of VO2 NWs promisingly paves the way for designing novel metal-insulator transition devices based on VO2 NWs.
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Affiliation(s)
- Chun Cheng
- Department of Materials Science and Engineering, South University of Science and Technology, Shenzhen 518055, China
| | - Hua Guo
- National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Abbas Amini
- School of Computing, Engineering and Mathematics, University of Western Sydney, Kingswood, NSW 2751, Australia
| | - Kai Liu
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
| | - Deyi Fu
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
| | - Jian Zou
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
| | - Haisheng Song
- Wuhan National Laboratory for Optoelectronics (WNLO) and the School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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27
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Liu B, Cai D, Liu Y, Wang D, Wang L, Xie W, Li Q, Wang T. Strongly coupled hybrid nanostructures for selective hydrogen detection--understanding the role of noble metals in reducing cross-sensitivity. NANOSCALE 2014; 6:4758-4764. [PMID: 24658357 DOI: 10.1039/c3nr06569c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Noble metal-semiconductor hybrid nanostructures can offer outperformance to gas sensors in terms of sensitivity and selectivity. In this work, a catalytically activated (CA) hydrogen sensor is realized based on strongly coupled Pt/Pd-WO3 hybrid nanostructures constructed by a galvanic replacement participated solvothermal procedure. The room-temperature operation and high selectivity distinguish this sensor from the traditional ones. It is capable of detecting dozens of parts per million (ppm) hydrogen in the presence of thousands of ppm methane gas. An insight into the role of noble metals in reducing cross-sensitivity is provided by comparing the sensing properties of this sensor with a traditional thermally activated (TA) one made from the same pristine WO3. Based on both experimental and density functional theory (DFT) calculation results, the cross-sensitivity of the TA sensor is found to have a strong dependence on the highest occupied molecular orbital (HOMO) level of the hydrocarbon molecules. The high selectivity of the CA sensor comes from the reduced impact of gas frontier orbitals on the charge transfer process by the nano-scaled metal-semiconductor (MS) interface. The methodology demonstrated in this work indicates that rational design of MS hybrid nanostructures can be a promising strategy for highly selective gas sensing applications.
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Affiliation(s)
- Bin Liu
- Pen-Tung Sah Institute of Micro-Nano Science and Technology of Xiamen University, Xiamen, 361005, China.
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28
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Trung DD, Hoa ND, Tong PV, Duy NV, Dao TD, Chung HV, Nagao T, Hieu NV. Effective decoration of Pd nanoparticles on the surface of SnO2 nanowires for enhancement of CO gas-sensing performance. JOURNAL OF HAZARDOUS MATERIALS 2014; 265:124-132. [PMID: 24355775 DOI: 10.1016/j.jhazmat.2013.11.054] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 10/18/2013] [Accepted: 11/24/2013] [Indexed: 06/03/2023]
Abstract
Decoration of noble metal nanoparticles (NPs) on the surface of semiconducting metal oxide nanowires (NWs) to enhance material characteristics, functionalization, and sensing abilities has attracted increasing interests from researchers worldwide. In this study, we introduce an effective method for the decoration of Pd NPs on the surface of SnO2 NWs to enhance CO gas-sensing performance. Single-crystal SnO2 NWs were fabricated by chemical vapor deposition, whereas Pd NPs were decorated on the surface of SnO2 NWs by in situ reduction of the Pd complex at room temperature without using any linker or reduction agent excepting the copolymer P123. The materials were characterized by advanced techniques, such as high-resolution transmission electron microscopy, scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The Pd NPs were effectively decorated on the surface of SnO2 NWs. As an example, the CO sensing characteristics of SnO2 NWs decorated with Pd NPs were investigated at different temperatures. Results revealed that the gas sensor exhibited excellent sensing performance to CO at low concentration (1-25ppm) with ultrafast response-recovery time (in seconds), high responsivity, good stability, and reproducibility.
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Affiliation(s)
- Do Dang Trung
- International Training Institute for Materials Science, Hanoi University of Science and Technology, No. 1 Dai Co Viet Road, Hanoi, Viet Nam
| | - Nguyen Duc Hoa
- International Training Institute for Materials Science, Hanoi University of Science and Technology, No. 1 Dai Co Viet Road, Hanoi, Viet Nam.
| | - Pham Van Tong
- International Training Institute for Materials Science, Hanoi University of Science and Technology, No. 1 Dai Co Viet Road, Hanoi, Viet Nam
| | - Nguyen Van Duy
- International Training Institute for Materials Science, Hanoi University of Science and Technology, No. 1 Dai Co Viet Road, Hanoi, Viet Nam
| | - T D Dao
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - H V Chung
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - T Nagao
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Nguyen Van Hieu
- International Training Institute for Materials Science, Hanoi University of Science and Technology, No. 1 Dai Co Viet Road, Hanoi, Viet Nam.
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Jiang C, Han Y, Liu S, Zhang Z. A general approach to functional metal oxide nanobelts: thermal decomposition of precursors and interface diffusion growth mechanism. CrystEngComm 2014. [DOI: 10.1039/c3ce42124d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Zhang J, Strelcov E, Kolmakov A. Heat dissipation from suspended self-heated nanowires: gas sensor prospective. NANOTECHNOLOGY 2013; 24:444009. [PMID: 24113219 DOI: 10.1088/0957-4484/24/44/444009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The strong temperature dependence of the electrical conductivity in semiconductors was employed for gas and pressure sensing with a self-heated Si nanowire resistor. The electrical conductivity in such a device depends on heat dissipation and partitioning inside the device and was studied comparatively for suspended and supported device architectures. The appearance of the exhaustion region in the temperature-dependent resistivity of a Joule-heated nanowire was used as a temperature marker for implementation of the quasi-constant temperature operation mode. At low pressures, the sensor is idle due to dominant heat dissipation from the nanowire to the substrate and/or electrodes. Above ca. 10 Torr the sensitivity to gases has a strong dependence on pressure as well as on the type of gas and is determined by conductive heat transfer between the nanowire surface and ambient. This implies that, in contrast to macroscopic devices, the heat dissipation via the convection mechanism does not contribute significantly to the heat transfer from the self-heated nanowire. The thermal sensitivity of the sensor to reactive gases depends on the effectiveness of the particular endothermic/exothermic reaction at the surface of the nanowire and was explored for the case of acetone-air mixture. The strong coupling of the electrical and thermal properties in the individual Joule-heated semiconducting nanowire allows fabrication of power-efficient multi-parametric nanoscopic gas/pressure sensors that are analogs of Pirani and pellistor type detectors.
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Affiliation(s)
- Jie Zhang
- Physics Department, Southern Illinois University, Carbondale, IL 62901, USA
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31
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Dai Z, Xu L, Duan G, Li T, Zhang H, Li Y, Wang Y, Wang Y, Cai W. Fast-response, sensitivitive and low-powered chemosensors by fusing nanostructured porous thin film and IDEs-microheater chip. Sci Rep 2013; 3:1669. [PMID: 23591580 PMCID: PMC3628220 DOI: 10.1038/srep01669] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 04/02/2013] [Indexed: 12/31/2022] Open
Abstract
The chemiresistive thin film gas sensors with fast response, high sensitivity, low power consumption and mass-produced potency, have been expected for practical application. It requires both sensitive materials, especially exquisite nanomaterials, and efficient substrate chip for heating and electrical addressing. However, it is challenging to achieve repeatable microstructures across the films and low power consumption of substrate chip. Here we presented a new sensor structure via the fusion of metal-oxide nanoporous films and micro-electro-mechanical systems (MEMS)-based sensing chip. An interdigital-electrodes (IDEs) and microheater integrated MEMS structure is designed and employed as substrate chip to in-situ fabricate colloidal monolayer template-induced metal-oxide (egg. SnO2) nanoporous sensing films. This fused sensor demonstrates mW-level low power, ultrafast response (~1 s), and parts-per-billion lever detection for ethanol gas. Due to the controllable template strategy and mass-production potential, such micro/nano fused high-performance gas sensors will be next-generation key miniaturized/integrated devices for advanced practical applications.
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Affiliation(s)
- Zhengfei Dai
- Key Lab of Materials Physics, Anhui Key lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, Anhui, China
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32
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Zou X, Wang J, Liu X, Wang C, Jiang Y, Wang Y, Xiao X, Ho JC, Li J, Jiang C, Fang Y, Liu W, Liao L. Rational design of sub-parts per million specific gas sensors array based on metal nanoparticles decorated nanowire enhancement-mode transistors. NANO LETTERS 2013; 13:3287-92. [PMID: 23796312 DOI: 10.1021/nl401498t] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
"One key to one lock" hybrid sensor configuration is rationally designed and demonstrated as a direct effective route for the target-gas-specific, highly sensitive, and promptly responsive chemical gas sensing for room temperature operation in a complex ambient background. The design concept is based on three criteria: (i) quasi-one-dimensional metal oxide nanostructures as the sensing platform which exhibits good electron mobility and chemical and thermal stability; (ii) deep enhancement-mode field-effect transistors (E-mode FETs) with appropriate threshold voltages to suppress the nonspecific sensitivity to all gases (decouple the selectivity and sensitivity away from nanowires); (iii) metal nanoparticle decoration onto the nanostructure surface to introduce the gas specific selectivity and sensitivity to the sensing platform. In this work, using Mg-doped In2O3 nanowire E-mode FET sensor arrays decorated with various discrete metal nanoparticles (i.e., Au, Ag, and Pt) as illustrative prototypes here further confirms the feasibility of this design. Particularly, the Au decorated sensor arrays exhibit more than 3 orders of magnitude response to the exposure of 100 ppm CO among a mixture of gases at room temperature. The corresponding response time and detection limit are as low as ∼4 s and ∼500 ppb, respectively. All of these could have important implications for this "one key to one lock" hybrid sensor configuration which potentially open up a rational avenue to the design of advanced-generation chemical sensors with unprecedented selectivity and sensitivity.
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Affiliation(s)
- Xuming Zou
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University , Wuhan 430072, China
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33
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Wang YT, Chen CH. Facile Growth of Thermochromic VO2 Nanostructures with Greatly Varied Phases and Morphologies. Inorg Chem 2013; 52:2550-5. [DOI: 10.1021/ic302562j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ying-Ting Wang
- Department of Materials Science and Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road,
Hsin-Chu, Taiwan, 30010, Republic of China
| | - Chun-Hua Chen
- Department of Materials Science and Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road,
Hsin-Chu, Taiwan, 30010, Republic of China
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Sim JS, Zhou Y, Ramanathan S. Suspended sub-50 nm vanadium dioxide membrane transistors: fabrication and ionic liquid gating studies. NANOSCALE 2012; 4:7056-7062. [PMID: 23051929 DOI: 10.1039/c2nr32049e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We demonstrate a robust lithographic patterning method to fabricate self-supported sub-50 nm VO(2) membranes that undergo a phase transition. Utilizing such self-supported membranes, we directly observed a shift in the metal-insulator transition temperature arising from stress relaxation and consistent opening of the hysteresis. Electric double layer transistors were then fabricated with the membranes and compared to thin film devices. The ionic liquid allowed reversible modulation of channel resistance and distinguishing bulk processes from the surface effects. From the shift in the metal-insulator transition temperature, the carrier density doped through electrolyte gating is estimated to be 1 × 10(20) cm(-3). Hydrogen annealing studies showed little difference in resistivity between the film and the membrane indicating rapid diffusion of hydrogen in the vanadium oxide rutile lattice consistent with previous observations. The ability to fabricate electrically-wired, suspended VO(2) ultra-thin membranes creates new opportunities to study mesoscopic size effects on phase transitions and may also be of interest in sensor devices.
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Affiliation(s)
- Jai S Sim
- School of Engineering and Applied Sciences, 9 Oxford St., Room 405, Cambridge, MA 02138, USA
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Gu H, Wang Z, Hu Y. Hydrogen gas sensors based on semiconductor oxide nanostructures. SENSORS 2012; 12:5517-50. [PMID: 22778599 PMCID: PMC3386698 DOI: 10.3390/s120505517] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 04/01/2012] [Accepted: 04/25/2012] [Indexed: 11/16/2022]
Abstract
Recently, the hydrogen gas sensing properties of semiconductor oxide (SMO) nanostructures have been widely investigated. In this article, we provide a comprehensive review of the research progress in the last five years concerning hydrogen gas sensors based on SMO thin film and one-dimensional (1D) nanostructures. The hydrogen sensing mechanism of SMO nanostructures and some critical issues are discussed. Doping, noble metal-decoration, heterojunctions and size reduction have been investigated and proved to be effective methods for improving the sensing performance of SMO thin films and 1D nanostructures. The effect on the hydrogen response of SMO thin films and 1D nanostructures of grain boundary and crystal orientation, as well as the sensor architecture, including electrode size and nanojunctions have also been studied. Finally, we also discuss some challenges for the future applications of SMO nanostructured hydrogen sensors.
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Affiliation(s)
- Haoshuang Gu
- Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China.
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Demeritte T, Kanchanapally R, Fan Z, Singh AK, Senapati D, Dubey M, Zakar E, Ray PC. Highly efficient SERS substrate for direct detection of explosive TNT using popcorn-shaped gold nanoparticle-functionalized SWCNT hybrid. Analyst 2012; 137:5041-5. [DOI: 10.1039/c2an35984g] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Gannon G, O’Dwyer C, Larsson JA, Thompson D. Interdigitating Organic Bilayers Direct the Short Interlayer Spacing in Hybrid Organic–Inorganic Layered Vanadium Oxide Nanostructures. J Phys Chem B 2011; 115:14518-25. [DOI: 10.1021/jp207709c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- G. Gannon
- Theory Modelling and Design Centre, Tyndall National Institute, University College Cork, Cork, Ireland
| | - C. O’Dwyer
- Department of Physics and Energy, Materials and Surface Science Institute, University of Limerick, Limerick, Ireland
| | - J. A. Larsson
- Theory Modelling and Design Centre, Tyndall National Institute, University College Cork, Cork, Ireland
| | - D. Thompson
- Theory Modelling and Design Centre, Tyndall National Institute, University College Cork, Cork, Ireland
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Nanostructured VOx/VO(PO4)n Using Solid-State Vanadium Containing Phosphazene Precursors: A Useful Potential Bi-Catalyst System. J CLUST SCI 2011. [DOI: 10.1007/s10876-011-0415-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Beqa L, Singh AK, Fan Z, Senapati D, Ray PC. Chemically attached gold nanoparticle–carbon nanotube hybrids for highly sensitive SERS substrate. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.07.037] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zhang S, Kim IS, Lauhon LJ. Stoichiometry engineering of monoclinic to rutile phase transition in suspended single crystalline vanadium dioxide nanobeams. NANO LETTERS 2011; 11:1443-1447. [PMID: 21428415 DOI: 10.1021/nl103925m] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Coexisting monoclinic M(1) (insulating) and rutile (metallic) domains were observed in free-standing vanadium dioxide nanobeams at room temperature. Similar domain structures have been attributed to interfacial strain, which was not present here. Annealing under reducing conditions indicated that a deficiency of oxygen stabilizes the rutile phase to temperatures as low as 103 K, which represents an unprecedented suppression of the phase transition by 238 K. In a complementary manner, oxygen-rich growth conditions stabilize the metastable monoclinic M(2) and triclinic T (or M(3)) phases. A pseudophase diagram with dimensions of temperature and stoichiometry is established that highlights the accessibility of new phases in the nanobeam geometry.
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Affiliation(s)
- Shixiong Zhang
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
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Ganzhorn M, Vijayaraghavan A, Dehm S, Hennrich F, Green AA, Fichtner M, Voigt A, Rapp M, von Löhneysen H, Hersam MC, Kappes MM, Krupke R. Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes. ACS NANO 2011; 5:1670-6. [PMID: 21341751 DOI: 10.1021/nn101992g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The work function of palladium is known to be sensitive to hydrogen by the formation of a surface dipole layer or Pd hydride. One approach to detect such a change in the work function can be based on the formation of a Schottky barrier between the palladium metal and a semiconductor. Here, we study the hydrogen sensitivity of Schottky barrier field-effect transistors made for the first time from diameter- and chirality-sorted semiconducting single-walled carbon nanotubes (s-SWNTs) in contact with Pd electrodes. We observe an unrivaled 100-fold change in the on-state conductance at 100 ppm H2 compared to air for devices with s-SWNT and diameters between 1 and 1.6 nm. Hydrogen sensing is not observed for devices of Pd-contacted few-layer graphene (FLG), as expected due to the absence of a significant Schottky barrier. Unexpectedly, we observe also a vanishing sensitivity for small-diameter SWNTs. We explain this observation by changes in the nanotube work function caused by spillover and chemisorption of atomic hydrogen onto small-diameter nanotubes. We also observe that long-term sensing stability is only achieved if the gate voltage is inverted periodically. Under constant gate bias, the sensitivity reduces with time, which we relate to gate screening by accumulated charges in the substrate.
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Affiliation(s)
- Marc Ganzhorn
- Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
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Hong YX, Kuo W, Lin KJ. Nonvolatile gating effects on radicals-containing vanadium oxide nanowires by gas molecule absorption and diffusion. NANOTECHNOLOGY 2011; 22:115501. [PMID: 21301080 DOI: 10.1088/0957-4484/22/11/115501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The charge conduction of a single nanowire of radicals-containing vanadium oxides was experimentally studied and found to be modulated by different gas exposures, showing a gating effect by the adsorption and absorption of different gas molecules. After N(2) and O(2) gas are introduced, the nanowires show an abrupt increase of the resistance but show the opposite trend within a longer timescale of several ks. The introduction of N(2) and O(2) can respectively 'write' the nanowire into high and low resistance states, which are metastable in a high vacuum. The long-term gating effect which was attributed to the interlayer diffusion of the gas molecules can be registered on the nanowire in the high vacuum environment.
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Affiliation(s)
- Yi-Xuan Hong
- Department of Physics, National Chung Hsing University, Taichung, Taiwan
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Beliatis MJ, Martin NA, Leming EJ, Silva SRP, Henley SJ. Laser ablation direct writing of metal nanoparticles for hydrogen and humidity sensors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1241-1244. [PMID: 21188990 DOI: 10.1021/la1038574] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A UV pulsed laser writing technique to fabricate metal nanoparticle patterns on low-cost substrates is demonstrated. We use this process to directly write nanoparticle gas sensors, which operate via quantum tunnelling of electrons at room temperature across the device. The advantages of this method are no lithography requirements, high precision nanoparticle placement, and room temperature processing in atmospheric conditions. Palladium-based nanoparticle sensors are tested for the detection of water vapor and hydrogen within controlled environmental chambers. The electrical conduction mechanism responsible for the very high sensitivity of the devices is discussed with regard to the interparticle capacitance and the tunnelling resistance.
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Affiliation(s)
- Michail J Beliatis
- Nano-Electronics centre, Advanced Technology Institute, University of Surrey, Guildford GU2 7XH, United Kingdom
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Noh JS, Kim H, Kim BS, Lee E, Cho HH, Lee W. High-performance vertical hydrogen sensors using Pd-coated rough Si nanowires. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12701b] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Hu B, Ding Y, Chen W, Kulkarni D, Shen Y, Tsukruk VV, Wang ZL. External-strain induced insulating phase transition in VO₂nanobeam and its application as flexible strain sensor. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:5134-5139. [PMID: 20842663 DOI: 10.1002/adma.201002868] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Bin Hu
- Georgia Institute of Technology, Atlanta, 30332-0245, USA
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El-Safty SA, Shahat A, Mekawy M, Nguyen H, Warkocki W, Ohnuma M. Mesoporous silica nanotubes hybrid membranes for functional nanofiltration. NANOTECHNOLOGY 2010; 21:375603. [PMID: 20720295 DOI: 10.1088/0957-4484/21/37/375603] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The development of nanofiltration systems would greatly assist in the production of well-defined particles and biomolecules with unique properties. We report a direct, simple synthesis of hexagonal silica nanotubes (NTs), which vertically aligned inside anodic alumina membranes (AAM) by means of a direct templating method of microemulsion phases with cationic surfactants. The direct approach was used as soft templates for predicting ordered assemblies of surfactant/silica composites through strong interactions within AAM pockets. Thus, densely packed NTs were successfully formed in the entirety of the AAM channels. These silica NTs were coated with layers of organic moieties to create a powerful technique for the ultrafine filtration. The resulting modified-silica NTs were chemically robust and showed affinity toward the transport of small molecular particles. The rigid silica NTs inside AAM channels had a pore diameter of <or= 4 nm and were used as ultrafine filtration systems for noble metal nanoparticles (NM NPs) and semiconductor nanocrystals (SC NCs) fabricated with a wide range of sizes (1.0-50 nm) and spherical/pyramidal morphologies. Moreover, the silica NTs hybrid membranes were also found to be suitable for separation of biomolecules such as cytochrome c (CytC). Importantly, this nanofilter design retains high nanofiltration efficiency of NM NPs, SC NCs and biomolecules after a number of reuse cycles. Such retention is crucial in industrial applications.
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Affiliation(s)
- Sherif A El-Safty
- National Institute for Materials Science, Exploratory Materials Research Laboratory for Energy and Environment, Tsukuba, Ibaraki, Japan.
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Mai L, Xu L, Gao Q, Han C, Hu B, Pi Y. Single beta-AgVO3 nanowire H2S sensor. NANO LETTERS 2010; 10:2604-8. [PMID: 20503986 DOI: 10.1021/nl1013184] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report the electrical transport and H(2)S sensing properties of single beta-AgVO(3) nanowire device. beta-AgVO(3) nanowires were successfully prepared by ultrasonic treatment followed by hydrothermal reaction using V(2)O(5) sol. The individual beta-AgVO(3) nanowire exhibits a "threshold switching" phenomenon. High bias (i.e., 6 V for Au contacts) is required to initially switch the individual nanowire device from nonconductive to conductive, and it may be related to the formation of nanoscale metallic Ag when enough voltage is applied between the two electrodes. This novel nanomaterial shows good H(2)S sensing performances with short response and recovery time within 20 s, relatively low response concentration of 50 ppm, and good selectivity.
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Affiliation(s)
- Liqiang Mai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China.
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Seo M, Kyoung J, Park H, Koo S, Kim HS, Bernien H, Kim BJ, Choe JH, Ahn YH, Kim HT, Park N, Park QH, Ahn K, Kim DS. Active terahertz nanoantennas based on VO2 phase transition. NANO LETTERS 2010; 10:2064-8. [PMID: 20469898 DOI: 10.1021/nl1002153] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the metallic composite atom(1-6). Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated(7-11). However, the dynamic control ranges are still limited to less than a factor of 10,(7-11) with the applicable bandwidth defined by the sharp resonance features. Here, we present ultra-broad-band metamaterial thin film with colossal dynamic control range, fulfilling present day research demands. Hybridized with thin VO(2) (vanadium dioxide) (12-18) films, nanoresonator supercell arrays designed for one decade of spectral width in terahertz frequency region show an unprecedented extinction ratio of over 10000 when the underlying thin film experiences a phase transition. Our nanoresonator approach realizes the full potential of the thin film technology for long wavelength applications.
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Affiliation(s)
- Minah Seo
- Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
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Choi KJ, Jang HW. One-dimensional oxide nanostructures as gas-sensing materials: review and issues. SENSORS 2010; 10:4083-99. [PMID: 22319343 PMCID: PMC3274262 DOI: 10.3390/s100404083] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Revised: 04/15/2010] [Accepted: 04/16/2010] [Indexed: 01/19/2023]
Abstract
In this article, we review gas sensor application of one-dimensional (1D) metal-oxide nanostructures with major emphases on the types of device structure and issues for realizing practical sensors. One of the most important steps in fabricating 1D-nanostructure devices is manipulation and making electrical contacts of the nanostructures. Gas sensors based on individual 1D nanostructure, which were usually fabricated using electron-beam lithography, have been a platform technology for fundamental research. Recently, gas sensors with practical applicability were proposed, which were fabricated with an array of 1D nanostructures using scalable micro-fabrication tools. In the second part of the paper, some critical issues are pointed out including long-term stability, gas selectivity, and room-temperature operation of 1D-nanostructure-based metal-oxide gas sensors.
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Affiliation(s)
- Kyoung Jin Choi
- Nano-Materials Center, Korea Institute of Science and Technology, Seoul, 130-650, Korea
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +82-2-958-5502; Fax: +82-2-958-5509
| | - Ho Won Jang
- Electronic Materials Center, Korea Institute of Science and Technology, Seoul, 130-650, Korea; E-Mail:
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