1
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Tang C, Su M, Lu T, Zheng J, Wang J, Zhou Y, Zou YL, Liu W, Huang R, Xu W, Chen L, Zhang Y, Bai J, Yang Y, Shi J, Liu J, Hong W. Massive acceleration of S N2 reaction using the oriented external electric field. Chem Sci 2024; 15:13486-13494. [PMID: 39183916 PMCID: PMC11339978 DOI: 10.1039/d4sc03759f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2024] [Accepted: 07/17/2024] [Indexed: 08/27/2024] Open
Abstract
Nucleophilic substitution is one of the most fundamental chemical reactions, and the pursuit of high reaction rates of the reaction is one of the ultimate goals in catalytic and organic chemistry. The reaction barrier of the nucleophilic substitution originates from the highly polar nature of the transition state that can be stabilized under the electric field created by the solvent environment. However, the intensity of the induced solvent-electric field is relatively small due to the random orientation of solvent molecules, which hinders the catalytic effects and restricts the reaction rates. This work shows that oriented external electric fields applied within a confined nanogap between two nanoscopic tips could accelerate the Menshutkin reaction by more than four orders of magnitude (over 39 000 times). The theoretical calculations reveal that the electric field inside the nanogap reduces the energy barrier to increase the reaction rate. Our work suggests the great potential of electrostatic catalysis for green synthesis in the future.
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Affiliation(s)
- Chun Tang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Meiling Su
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Taige Lu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Jueting Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Juejun Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Yu Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Yu-Ling Zou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Wenqing Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Ruiyun Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Wei Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Lijue Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Yanxi Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Jie Bai
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Yang Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Jia Shi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Junyang Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University Xiamen China
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2
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Tanaka Y. Organometallics in molecular junctions: conductance, functions, and reactions. Dalton Trans 2024; 53:8512-8523. [PMID: 38712999 DOI: 10.1039/d4dt00668b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Molecular junctions, which involve sandwiching molecular structures between electrodes, play a crucial role in molecular electronics. Recent advances in this field have revealed the vital role of organometallic chemistry in the investigation of molecular junctions, which has added to their well-known contributions to catalysis and materials chemistry. This review summarizes the recent examples of organometallic chemistry applications in molecular junctions, which can be categorized into three types, i.e., class I encompassing molecular junctions with bridging organometallic complexes, class II involving molecular junctions with covalent and noncovalent metal electrode-carbon bonds, and class III comprising organometallic reactions within molecular junctions.
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Affiliation(s)
- Yuya Tanaka
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
- School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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3
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Chen L, Yang Z, Lin Q, Li X, Bai J, Hong W. Evolution of Single-Molecule Electronic Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1988-2004. [PMID: 38227964 DOI: 10.1021/acs.langmuir.3c03104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Single-molecule electronics can fabricate single-molecule devices via the construction of molecule-electrode interfaces and also provide a unique tool to investigate single-molecule scale physicochemical processes at these interfaces. To investigate single-molecule electronic devices with desired functionalities, an understanding of the interface evolution processes in single-molecule devices is essential. In this review, we focus on the evolution of molecule-electrode interface properties, including the background of interface evolution in single-molecule electronics, the construction of different types of single-molecule interfaces, and the regulation methods. Finally, we discuss the perspective of future characterization techniques and applications for single-molecule electronic interfaces.
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Affiliation(s)
- Lichuan Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Zixian Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Qichao Lin
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Xiaohui Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Jie Bai
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
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Dalmieda J, Shi W, Li L, Venkataraman L. Solvent-Mediated Modulation of the Au-S Bond in Dithiol Molecular Junctions. NANO LETTERS 2024; 24:703-707. [PMID: 38175934 DOI: 10.1021/acs.nanolett.3c04058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Gold-dithiol molecular junctions have been studied both experimentally and theoretically. However, the nature of the gold-thiolate bond as it relates to the solvent has seldom been investigated. It is known that solvents can impact the electronic structure of single-molecule junctions, but the correlation between the solvent and dithiol-linked single-molecule junction conductance is not well understood. We study molecular junctions formed with thiol-terminated phenylenes from both 1-chloronaphthalene and 1-bromonaphthalene solutions. We find that the most probable conductance and the distribution of conductances are both affected by the solvent. First-principles calculations show that junction conductance depends on the binding configurations (adatom, atop, and bridge) of the thiolate on the Au surface, as has been shown previously. More importantly, we find that brominated solvents can restrict the binding of thiols to specific Au sites. This mechanism offers new insight into the effects of the solvent environment on covalent bonding in molecular junctions.
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Affiliation(s)
- Johnson Dalmieda
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - Wanzhuo Shi
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - Liang Li
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - Latha Venkataraman
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
- Department of Applied Physics, Columbia University, 500 West 120th Street, New York, New York 10027, United States
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5
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Wei S, Wang X, Zhao X, Zhao K, Xu L, Chen Y. Detection of pesticide residues on flexible and transparent fluorinated polyimide film based on surface-enhanced Raman spectroscopy technology. Anal Chim Acta 2023; 1283:341958. [PMID: 37977783 DOI: 10.1016/j.aca.2023.341958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 10/03/2023] [Accepted: 10/24/2023] [Indexed: 11/19/2023]
Abstract
BACKGROUND Excessive pesticide residues will seriously endanger human health. The complexity and lag of the current popular analytical methods hinder the timeliness of food safety analysis. Surface-enhanced Raman scattering (SERS) was an ultra-sensitive vibration spectroscopy technology with the advantages of less time cost, non-destructive and semi-quantitative detection, which has attracted much attention in the rapid field detection of pesticide residue. It was clear that we need an efficient and convenient substrate for pesticide residue detection based on SRES technology, which needs to be portable, flexible, transparent and easy to detect irregular object surfaces. RESULTS A novel SERS sensor was designed to detect single and multi-component pesticide residues on irregular fruit and vegetable surfaces by in-situ growth of silver nanoparticles on a flexible and transparent fluorinated polyimide (FPI) substrate. Among them, Ag NPs were synthesized by liquid phase reduction method (AgNO3-PVP and NaBH4). The results showed that the detection limit of 1-4 BDT was down to 10-10 mol L-1, the enhancement factor (EF) was up to 1.57 × 107, and relative standard deviation (RSD) was 7.49 %. By this method, tricyclazole solution at a concentration of 0.01 mg L-1 was still detectable by the FPI@Ag SERS substrate. The linear quantification was achieved in the range from 100 mg L-1 to 0.01 mg L-1. Two mixed pesticides, tricyclazole and imazalil, were also successfully distinguished. SIGNIFICANCE This represents the formation of a flexible, foldable and transparent substrate for rapid on-site detection. Results can be obtained in <5 min by attaching the substrate to the substance to be tested. And the SERS substrate prepared with high sensitivity, stability, portable and convenient analysis, which provided new ideas for efficient and rapid household food safety detection.
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Affiliation(s)
- Siyu Wei
- School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, PR China
| | - Xinfang Wang
- College of Chemistry and Chemical Engineering, Dezhou University, Dezhou, 253023, PR China
| | - Xinyu Zhao
- School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, PR China
| | - Ke Zhao
- School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, PR China
| | - Linzhe Xu
- School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, PR China
| | - Yingbo Chen
- School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, PR China.
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6
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Liu H, Chen L, Zhang H, Yang Z, Ye J, Zhou P, Fang C, Xu W, Shi J, Liu J, Yang Y, Hong W. Single-molecule photoelectron tunnelling spectroscopy. NATURE MATERIALS 2023; 22:1007-1012. [PMID: 37349394 DOI: 10.1038/s41563-023-01591-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 05/25/2023] [Indexed: 06/24/2023]
Abstract
Experimental mapping of transmission is essential for understanding and controlling charge transport through molecular devices and materials. Here we developed a single-molecule photoelectron tunnelling spectroscopy approach for mapping transmission beyond the HOMO-LUMO gap of the single diketopyrrolopyrrole molecule junction using an ultrafast-laser combined scanning tunnelling microscope-based break junction set-up at room temperature. Two resonant transport channels of ultrafast photocurrent are found by our photoelectron tunnelling spectroscopy, ranging from 1.31 eV to 1.77 eV, consistent with the LUMO + 1 and LUMO + 2 in the transmission spectrum obtained by density functional theory calculations. Moreover, we observed the modulation of resonant peaks by varying bias voltages, which demonstrates the ability to quantitatively characterize the effect of the electric field on frontier molecular orbitals. Our single-molecule photoelectron tunnelling spectroscopy offers an avenue that allows us to explore the nature of energy-dependent charge transport through single-molecule junctions.
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Affiliation(s)
- Haojie Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Lijue Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Hao Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Zhangqiang Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Jingyao Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Ping Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Chao Fang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Wei Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Jia Shi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Junyang Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Ye Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, China.
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7
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Homma K, Kaneko S, Tsukagoshi K, Nishino T. Intermolecular and Electrode-Molecule Bonding in a Single Dimer Junction of Naphthalenethiol as Revealed by Surface-Enhanced Raman Scattering Combined with Transport Measurements. J Am Chem Soc 2023. [PMID: 37437895 PMCID: PMC10375526 DOI: 10.1021/jacs.3c02050] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
Electron transport through noncovalent interaction is of fundamental and practical importance in nanomaterials and nanodevices. Recent single-molecule studies employing single-molecule junctions have revealed unique electron transport properties through noncovalent interactions, especially those through a π-π interaction. However, the relationship between the junction structure and electron transport remains elusive due to the insufficient knowledge of geometric structures. In this article, we employ surface-enhanced Raman scattering (SERS) synchronized with current-voltage (I-V) measurements to characterize the junction structure, together with the transport properties, of a single dimer and monomer junction of naphthalenethiol, the former of which was formed by the intermolecular π-π interaction. The correlation analysis of the vibrational energy and electrical conductance enables identifying the intermolecular and molecule-electrode interactions in these molecular junctions and, consequently, addressing the transport properties exclusively associated with the π-π interaction. In addition, the analysis achieved discrimination of the interaction between the NT molecule and the Au electrode of the junction, i.e., Au-π interactions through-π coupling and though-space coupling. The power density spectra support the noncovalent character at the interfaces in the molecular junctions. These results demonstrate that the simultaneous SERS and I-V technique provides a unique means for the structural and electrical investigation of noncovalent interactions.
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Affiliation(s)
- Kanji Homma
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Satoshi Kaneko
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kazuhito Tsukagoshi
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Tomoaki Nishino
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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8
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Xu Y, Zhao W, Zou D, Li X, Qin M, Wang C, Liu D, Wang M. Effects of Inorganic Substitutions and Different Metal Electrode Materials on Electronic Transport Properties of Organic Molecular Devices. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 37307594 DOI: 10.1021/acs.langmuir.3c00773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Incorporating inorganic components into organic molecular devices offers one novel alternative to address challenges existing in the fabrication and integration of nanoscale devices. In this study, using a theoretical method of density functional theory combined with the nonequilibrium Green's function, a series of benzene-based molecules with group III and V substitutions, including borazine molecule and XnB3-nN3H6 (X = Al or Ga, n = 1-3) molecules/clusters, are constructed and investigated. An analysis of electronic structures reveals that the introduction of inorganic components effectively reduces the energy gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital, albeit at the cost of reduced aromaticity in these molecules/clusters. Simulated electronic transport characteristics demonstrate that XnB3-nN3H6 molecules/clusters coupled between metal electrodes exhibit lower conductance compared to prototypical benzene molecule. Additionally, the choice of metal electrode materials significantly impacts the electronic transport properties, with platinum electrode devices displaying distinct behavior compared to silver, copper, and gold electrode devices. This distinction arises from the amount of transferred charge, which modulates the alignment between molecular orbitals and the Fermi level of the metal electrodes by shifting the molecular orbitals in energy. These findings provide valuable theoretical insights for the future design of molecular devices incorporating inorganic substitutions.
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Affiliation(s)
- Yuqing Xu
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Wenkai Zhao
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Dongqing Zou
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Xiaoteng Li
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Ming Qin
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Chunyang Wang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Desheng Liu
- School of Physics, Shandong University, Jinan 250100, P. R. China
- Department of Physics, Jining University, Qufu 273155, P. R. China
| | - Meishan Wang
- College of Integrated Circuits, Ludong University, Yantai 264025, P. R. China
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9
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Li T, Bandari VK, Schmidt OG. Molecular Electronics: Creating and Bridging Molecular Junctions and Promoting Its Commercialization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2209088. [PMID: 36512432 DOI: 10.1002/adma.202209088] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 11/28/2022] [Indexed: 06/02/2023]
Abstract
Molecular electronics is driven by the dream of expanding Moore's law to the molecular level for next-generation electronics through incorporating individual or ensemble molecules into electronic circuits. For nearly 50 years, numerous efforts have been made to explore the intrinsic properties of molecules and develop diverse fascinating molecular electronic devices with the desired functionalities. The flourishing of molecular electronics is inseparable from the development of various elegant methodologies for creating nanogap electrodes and bridging the nanogap with molecules. This review first focuses on the techniques for making lateral and vertical nanogap electrodes by breaking, narrowing, and fixed modes, and highlights their capabilities, applications, merits, and shortcomings. After summarizing the approaches of growing single molecules or molecular layers on the electrodes, the methods of constructing a complete molecular circuit are comprehensively grouped into three categories: 1) directly bridging one-molecule-electrode component with another electrode, 2) physically bridging two-molecule-electrode components, and 3) chemically bridging two-molecule-electrode components. Finally, the current state of molecular circuit integration and commercialization is discussed and perspectives are provided, hoping to encourage the community to accelerate the realization of fully scalable molecular electronics for a new era of integrated microsystems and applications.
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Affiliation(s)
- Tianming Li
- Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09126, Chemnitz, Germany
- Material Systems for Nanoelectronics, Chemnitz University of Technology, 09111, Chemnitz, Germany
| | - Vineeth Kumar Bandari
- Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09126, Chemnitz, Germany
- Material Systems for Nanoelectronics, Chemnitz University of Technology, 09111, Chemnitz, Germany
| | - Oliver G Schmidt
- Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09126, Chemnitz, Germany
- Material Systems for Nanoelectronics, Chemnitz University of Technology, 09111, Chemnitz, Germany
- Nanophysics, Dresden University of Technology, 01069, Dresden, Germany
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10
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Domke KF, Aragonès AC. Playing catch and release with single molecules: mechanistic insights into plasmon-controlled nanogaps. NANOSCALE 2023; 15:497-506. [PMID: 36394540 DOI: 10.1039/d2nr05448e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Single-molecule (SM) detection is essential for investigating processes at the molecular level. Nanogap-based detection approaches have proven to be highly accurate SM capture and detection platforms in the last decade. Unfortunately, these approaches face several inherent drawbacks, such as short detection times and the effects of Brownian motion, that can hinder molecular capture. Nanogap-based SM detection approaches have been successfully coupled to optical-based setups to exploit nearfield-assisted trapping to overcome these drawbacks and thus improve SM capture and detection. Here we present the first mechanistic study of nearfield effects on SM capture and release in nanogaps, using unsupervised machine learning methods based on hidden Markov models. We show that the nearfield strength can manipulate the kinetics of the SM capture and release processes. With increasing field strength, the rate constant of the capture kinetics increase while the release kinetics decrease, favouring the former over the latter. As a result, the SM capture state is more likely and more stable than the release state above a specific threshold nearfild strength. We have also estimated the decrease in the capture free-energy profile and the increase in the release profiles to be around 5 kJ mol-1 for the laser powers employed, ranging from laser-OFF conditions to 11 mW μm-2. We envisage that our findings can be combined with the electrocatalytic capabilities of the (nearfield) nanogap to develop next-generation molecular nanoreactors. This approach will open the door to highly efficient SM catalysis with precise extended monitoring timescales facilitated through the longer residence times of the reactant trapped inside the nanogap.
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Affiliation(s)
- Katrin F Domke
- University of Duisburg-Essen, Faculty of Chemistry, Universitätsstr. 5, 45141 Essen, Germany
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Albert C Aragonès
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, Marti i Franquès 1, 08028, Barcelona, Spain
- Institut de Química Teòrica i Computacional (IQTC), Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain.
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11
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Son J, Kim GH, Lee Y, Lee C, Cha S, Nam JM. Toward Quantitative Surface-Enhanced Raman Scattering with Plasmonic Nanoparticles: Multiscale View on Heterogeneities in Particle Morphology, Surface Modification, Interface, and Analytical Protocols. J Am Chem Soc 2022; 144:22337-22351. [PMID: 36473154 DOI: 10.1021/jacs.2c05950] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Surface-enhanced Raman scattering (SERS) provides significantly enhanced Raman scattering signals from molecules adsorbed on plasmonic nanostructures, as well as the molecules' vibrational fingerprints. Plasmonic nanoparticle systems are particularly powerful for SERS substrates as they provide a wide range of structural features and plasmonic couplings to boost the enhancement, often up to >108-1010. Nevertheless, nanoparticle-based SERS is not widely utilized as a means for reliable quantitative measurement of molecules largely due to limited controllability, uniformity, and scalability of plasmonic nanoparticles, poor molecular modification chemistry, and a lack of widely used analytical protocols for SERS. Furthermore, multiscale issues with plasmonic nanoparticle systems that range from atomic and molecular scales to assembled nanostructure scale are difficult to simultaneously control, analyze, and address. In this perspective, we introduce and discuss the design principles and key issues in preparing SERS nanoparticle substrates and the recent studies on the uniform and controllable synthesis and newly emerging machine learning-based analysis of plasmonic nanoparticle systems for quantitative SERS. Specifically, the multiscale point of view with plasmonic nanoparticle systems toward quantitative SERS is provided throughout this perspective. Furthermore, issues with correctly estimating and comparing SERS enhancement factors are discussed, and newly emerging statistical and artificial intelligence approaches for analyzing complex SERS systems are introduced and scrutinized to address challenges that cannot be fully resolved through synthetic improvements.
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Affiliation(s)
- Jiwoong Son
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Gyeong-Hwan Kim
- The Research Institute of Basic Sciences, Seoul National University, Seoul 08826, South Korea
| | - Yeonhee Lee
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Chungyeon Lee
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Seungsang Cha
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Jwa-Min Nam
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
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12
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Conductance Modulation in an α-Terthiophene Molecular Junction Characterized by Surface-Enhanced Raman Scattering. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2022. [DOI: 10.1380/ejssnt.2023-004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Single-Molecule Surface-Enhanced Raman Spectroscopy. SENSORS 2022; 22:s22134889. [PMID: 35808385 PMCID: PMC9269420 DOI: 10.3390/s22134889] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/20/2022] [Accepted: 06/24/2022] [Indexed: 12/04/2022]
Abstract
Single-molecule surface-enhanced Raman spectroscopy (SM-SERS) has the potential to detect single molecules in a non-invasive, label-free manner with high-throughput. SM-SERS can detect chemical information of single molecules without statistical averaging and has wide application in chemical analysis, nanoelectronics, biochemical sensing, etc. Recently, a series of unprecedented advances have been realized in science and application by SM-SERS, which has attracted the interest of various fields. In this review, we first elucidate the key concepts of SM-SERS, including enhancement factor (EF), spectral fluctuation, and experimental evidence of single-molecule events. Next, we systematically discuss advanced implementations of SM-SERS, including substrates with ultra-high EF and reproducibility, strategies to improve the probability of molecules being localized in hotspots, and nonmetallic and hybrid substrates. Then, several examples for the application of SM-SERS are proposed, including catalysis, nanoelectronics, and sensing. Finally, we summarize the challenges and future of SM-SERS. We hope this literature review will inspire the interest of researchers in more fields.
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14
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Tong L, Bao SY, Jiang CC, Li XC, Li JJ, Huang-Fu XN, Zheng JF, Shao Y, Wang YH, Gao YJ, Zhou XS. Tuning the binding configurations of single-molecule junctions by molecular co-assembly. Chem Commun (Camb) 2022; 58:4962-4965. [PMID: 35388389 DOI: 10.1039/d2cc00406b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Significant variability issues in metal-molecule contacts, such as adsorption geometry, lead to characteristic variability in the electrical responses of individual molecules. Herein, co-assembling 1-ethylimidazole (EIM) on Au(111) has been shown to be a feasible and effective strategy for tuning the binding configurations of pyridine-linked molecular junctions in the most common aqueous environments and atmospheric environments. The single-molecule conductance measurements clearly show a transition from multiple conductance peaks to a single conductance peak with increasing EIM concentration. Raman spectroscopy and DFT calculations suggest that the thermodynamically favorable EIM adsorbate results in the vertical orientation of the bipyridine.
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Affiliation(s)
- Ling Tong
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Shu-Yi Bao
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Chen-Chen Jiang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Xiao-Chong Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Jia-Jie Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Xu-Nan Huang-Fu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Ju-Fang Zheng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Yong Shao
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Ya-Hao Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
| | - Yi-Jing Gao
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China. .,Zhejiang Engineering Laboratory for Green Syntheses and Applications of Fluorine-Containing Specialty Chemicals, Institute of Advanced Fluorine-Containing Materials, Zhejiang Normal University, Jinhua 321004, China
| | - Xiao-Shun Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
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15
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Kobayashi S, Kaneko S, Tamaki T, Kiguchi M, Tsukagoshi K, Terao J, Nishino T. Principal Component Analysis of Surface-Enhanced Raman Scattering Spectra Revealing Isomer-Dependent Electron Transport in Spiropyran Molecular Junctions: Implications for Nanoscale Molecular Electronics. ACS OMEGA 2022; 7:5578-5583. [PMID: 35187372 PMCID: PMC8851897 DOI: 10.1021/acsomega.1c07105] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 01/19/2022] [Indexed: 06/14/2023]
Abstract
The characterization of single-molecule structures could provide significant insights into the operation mechanisms of functional devices. Structural transformation via isomerization has been extensively employed to implement device functionalities. Although single-molecule identification has recently been achieved using near-field spectroscopy, discrimination between isomeric forms remains challenging. Further, the structure-function relationship at the single-molecule scale remains unclear. Herein, we report the observation of the isomerization of spiropyran in a single-molecule junction (SMJ) using simultaneous surface-enhanced Raman scattering (SERS) and conductance measurements. SERS spectra were used to discriminate between isomers based on characteristic peaks. Moreover, conductance measurements, in conjunction with the principal component analysis of the SERS spectra, clearly showed the isomeric effect on the conductance of the SMJ.
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Affiliation(s)
- Shuji Kobayashi
- Department
of Chemistry, School of Science, Tokyo Institute
of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Satoshi Kaneko
- Department
of Chemistry, School of Science, Tokyo Institute
of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
- JST
PRESTO, 4-1-8 Honcho, Kawaguchi 332-0012, Japan
| | - Takashi Tamaki
- Department
of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan
| | - Manabu Kiguchi
- Department
of Chemistry, School of Science, Tokyo Institute
of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kazuhito Tsukagoshi
- International
Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Tsukuba, Ibaraki 305-0044, Japan
| | - Jun Terao
- Department
of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan
| | - Tomoaki Nishino
- Department
of Chemistry, School of Science, Tokyo Institute
of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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16
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Abd El-Mageed AIA, Ogawa T. Supramolecular Structures of Organic Molecules-Single Walled Carbon Nanotube Nanocomposites. ADVANCES IN NANOCOMPOSITE MATERIALS FOR ENVIRONMENTAL AND ENERGY HARVESTING APPLICATIONS 2022:921-940. [DOI: 10.1007/978-3-030-94319-6_29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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17
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Yasuraoka K, Kaneko S, Kobayashi S, Tsukagoshi K, Nishino T. Surface-Enhanced Raman Scattering Stimulated by Strong Metal-Molecule Interactions in a C 60 Single-Molecule Junction. ACS APPLIED MATERIALS & INTERFACES 2021; 13:51602-51607. [PMID: 34695353 DOI: 10.1021/acsami.1c09965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Specifying the geometric and electronic structures of a metal-molecule interface at the single-molecule level is crucial for the improvement of organic electronics. A single-molecule junction (SMJ) can be used to investigate interfaces because it can be regarded as an elementary unit of the interface structure. Although considerable efforts have been made to this end, the detection of structural changes in SMJs associated with metal-molecule interactions remains challenging. In this study, we detected the surface-enhanced Raman scattering (SERS) signal originating from the metal-molecule interaction change induced by a local structural change in a C60 SMJ. This junction has attracted wide attention owing to its unique electronic and vibronic properties. We fabricated a C60 SMJ using a lithographically fabricated Au electrode and measured the SERS spectra along with the current-voltage (I-V) response. By continuous measurement of SERS for the C60 SMJ, we obtained SERS spectra dependent on the local structural change. The analysis of the I-V response revealed that the vibration energy shift originates from the change in the local structure for different Au-C60 interactions. Based on the discrimination of the states in accordance with the Au-C60 interaction, we found that the probability of SERS for geometry with a large Au-C60 interaction was enhanced.
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Affiliation(s)
- Koji Yasuraoka
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Satoshi Kaneko
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
- JST PRESTO, 4-1-8 Honcho, Kawaguchi 332-0012, Japan
| | - Shuji Kobayashi
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kazuhito Tsukagoshi
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Tsukuba, Ibaraki 305-0044, Japan
| | - Tomoaki Nishino
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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18
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Fukuzumi R, Buerkle M, Li Y, Kaneko S, Li P, Kobayashi S, Fujii S, Kiguchi M, Nakamura H, Tsukagoshi K, Nishino T. Water Splitting Induced by Visible Light at a Copper-Based Single-Molecule Junction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2008109. [PMID: 34089231 DOI: 10.1002/smll.202008109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Water splitting is an essential process for converting light energy into easily storable energy in the form of hydrogen. As environmentally preferable catalysts, Cu-based materials have attracted attention as water-splitting catalysts. To enhance the efficiency of water splitting, a reaction process should be developed. Single-molecule junctions (SMJs) are attractive structures for developing these reactions because the molecule electronic state is significantly modulated, and characteristic electromagnetic effects can be expected. Here, water splitting is induced at Cu-based SMJ and the produced hydrogen is characterized at a single-molecule scale by employing electron transport measurements. After visible light irradiation, the conductance states originate from Cu/hydrogen molecule/Cu junctions, while before irradiation, only Cu/water molecule/Cu junctions were observed. The vibration spectra obtained from inelastic electron tunneling spectroscopy combined with the first-principles calculations reveal that the water molecule trapped between the Cu electrodes is decomposed and that hydrogen is produced. Time-dependent and wavelength-dependent measurements show that localized-surface plasmon decomposes the water molecule in the vicinity of the junction. These findings indicate the potential ability of Cu-based materials for photocatalysis.
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Affiliation(s)
- Risa Fukuzumi
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Marius Buerkle
- CD-FMat, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, Japan
| | - Yu Li
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Satoshi Kaneko
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Peihui Li
- Institute of Modern Optics, Nankai University, 94 Weijin Road, Tianjin, 300350, P. R. China
| | - Shuji Kobayashi
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Shintaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Manabu Kiguchi
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Hisao Nakamura
- CD-FMat, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, Japan
| | - Kazuhito Tsukagoshi
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Tomoaki Nishino
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
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19
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Lu Z, Zheng J, Shi J, Zeng BF, Yang Y, Hong W, Tian ZQ. Application of Micro/Nanofabrication Techniques to On-Chip Molecular Electronics. SMALL METHODS 2021; 5:e2001034. [PMID: 34927836 DOI: 10.1002/smtd.202001034] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/07/2021] [Indexed: 06/14/2023]
Abstract
Molecular electronics is a promising subject to overcome the size limitation of silicon-based electronic devices. In the past decades, various micro/nanofabrication techniques have been developed for constructing molecular junctions, and a number of breakthroughs are made in the characterizations and applications of the single-molecule device. The history and progress are reviewed in this article, laying emphasis on the recent works on the combination of micro/nanofabrication techniques with other techniques such as electrochemical deposition and surface-enhanced Raman spectroscopy (SERS). Some prototypical single-molecule devices such as molecular transistors are presented. Finally, the challenges and prospects in the fabrication of single-molecule devices are discussed.
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Affiliation(s)
- Zhixing Lu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
| | - Jueting Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
| | - Jie Shi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
| | - Biao-Feng Zeng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
| | - Yang Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, 361005, China
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, 361005, China
| | - Zhong-Qun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, 361005, China
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20
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Kobayashi S, Kaneko S, Kiguchi M, Tsukagoshi K, Nishino T. Tolerance to Stretching in Thiol-Terminated Single-Molecule Junctions Characterized by Surface-Enhanced Raman Scattering. J Phys Chem Lett 2020; 11:6712-6717. [PMID: 32619093 DOI: 10.1021/acs.jpclett.0c01526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigated the change in the metal-molecule interaction in a 1,4-benzenedithiol (BDT) single-molecule junction using a combination of surface-enhanced Raman scattering spectra and current-voltage curves. During the stretching process, the conductance of the junction systematically decreased, accompanied by an increase in the vibrational energy of the CC stretching mode. By analyzing the current-voltage curves and Raman spectra, we found that the interaction between the π orbital of BDT and the electronic states of Au was diminished by the orientation change of BDT during the stretching process. A comparison with a 4,4'-bipyridine single-molecule junction revealed that the reduction of coupling of the Au-S contacts was smaller than that of Au-pyridine contacts. Therefore, the electronic states originating from the contact geometry are responsible for the tolerance to the stretching of thiol-terminated molecular junctions.
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Affiliation(s)
- S Kobayashi
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - S Kaneko
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
- JST PRESTO, 4-1-8 Honcho, Kawaguchi 332-0012, Japan
| | - M Kiguchi
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - K Tsukagoshi
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Tsukuba, Ibaraki 305-0044, Japan
| | - T Nishino
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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21
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Siddiqui SA. Molecular modelling and simulation for the design of molecular diodes using density functional theory. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1726913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Shamoon Ahmad Siddiqui
- Promising Centre for Sensors and Electronic Devices, Najran University, Najran, Saudi Arabia
- Department of Physics, College of Arts and Science, Najran University, Najran, Saudi Arabia
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22
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Kaneko S, Montes E, Suzuki S, Fujii S, Nishino T, Tsukagoshi K, Ikeda K, Kano H, Nakamura H, Vázquez H, Kiguchi M. Identifying the molecular adsorption site of a single molecule junction through combined Raman and conductance studies. Chem Sci 2019; 10:6261-6269. [PMID: 31367301 PMCID: PMC6615215 DOI: 10.1039/c9sc00701f] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Accepted: 05/24/2019] [Indexed: 01/01/2023] Open
Abstract
Single-molecule junctions are ideal test beds for investigating the fundamentals of charge transport at the nanoscale. Conducting properties are strongly dependent on the metal-molecule interface geometry, which, however, is very poorly characterized due to numerous experimental challenges. We report on a new methodology for characterizing the adsorption site of single-molecule junctions through the combination of surface enhanced Raman scattering (SERS), current-voltage (I-V) curve measurements, and density functional theory simulations. This new methodology discriminates between three different adsorption sites for benzenedithiol and aminobenzenethiol junctions, which cannot be identified by solo measurements of either SERS or I-V curves. Using this methodology, we determine the interface geometry of these two prototypical molecules at the junction and its time evolution. By modulating the applied voltage, we can change and monitor the distribution of adsorption sites at the junction.
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Affiliation(s)
- Satoshi Kaneko
- Department of Chemistry , School of Science , Tokyo Institute of Technology , 2-12-1 W4-10 Ookayama , Meguro-ku , Tokyo 152-8551 , Japan .
| | - Enrique Montes
- Institute of Physics , Academy of Sciences of the Czech Republic , Cukrovarnicka 10 , Prague CZ-162 00 , Czech Republic .
| | - Sho Suzuki
- Department of Chemistry , School of Science , Tokyo Institute of Technology , 2-12-1 W4-10 Ookayama , Meguro-ku , Tokyo 152-8551 , Japan .
| | - Shintaro Fujii
- Department of Chemistry , School of Science , Tokyo Institute of Technology , 2-12-1 W4-10 Ookayama , Meguro-ku , Tokyo 152-8551 , Japan .
| | - Tomoaki Nishino
- Department of Chemistry , School of Science , Tokyo Institute of Technology , 2-12-1 W4-10 Ookayama , Meguro-ku , Tokyo 152-8551 , Japan .
| | - Kazuhito Tsukagoshi
- International Center for Materials Nanoarchitectonics , National Institute for Materials Science , Tsukuba , Ibaraki 305-0044 , Japan
| | - Katsuyoshi Ikeda
- Graduate School of Engineering , Nagoya Institute of Technology , Gokiso, Showa , Nagoya 466-8555 , Japan
| | - Hideaki Kano
- Institute of Applied Physics , University of Tsukuba , Tennodai 1-1-1 , Tsukuba 305-8573 , Japan
| | - Hisao Nakamura
- CD-FMat , National Institute of Advanced Industrial Science and Technology (AIST) , Central 2, Umezono 1-1-1 , Tsukuba , Ibaraki 305-8568 , Japan .
| | - Héctor Vázquez
- Institute of Physics , Academy of Sciences of the Czech Republic , Cukrovarnicka 10 , Prague CZ-162 00 , Czech Republic .
| | - Manabu Kiguchi
- Department of Chemistry , School of Science , Tokyo Institute of Technology , 2-12-1 W4-10 Ookayama , Meguro-ku , Tokyo 152-8551 , Japan .
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23
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Taninaka A, Yoshida S, Sugita Y, Takeuchi O, Shigekawa H. Evolution of local conductance pathways in a single-molecule junction studied using the three-dimensional dynamic probe method. NANOSCALE 2019; 11:5951-5959. [PMID: 30869706 DOI: 10.1039/c9nr00717b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Understanding of the dynamics of the bonding states of molecules with electrodes while the molecular conformation is changed is particularly important for elucidating the details of electrochemical devices as well as molecular devices in which the reaction dynamics of the electrodes and molecules plays an important role, such as in fuel cells, catalysis and bioelectrochemical devices. However, it has been difficult to make measurements when the distance between counter electrodes is short, namely, the molecule is raised from a lying form, almost parallel and close to the electrodes, toward a standing form and vice versa. We previously have developed a method called the three-dimensional (3D) dynamic probe method, which enables conductance measurement while the conformation of a single-molecule junction is precisely controlled by scanning tunneling microscopy (STM) techniques. Here, by combining this method with density functional theory (DFT) calculations, it has become possible to simultaneously consider the effects of the dynamics of molecular structures and the bonding states at the electrodes on the local transmission pathways, local-bond contributions to conductance. Here, by performing an analysis on 1,4-benzenediamine (BDA) and 1,4-benzenedithiol (BDT) single molecule junctions, we have observed, for the first time, the effect of a change in the molecular conformations and bonding states on the local transmission pathways for a short Au electrode distance condition.
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Affiliation(s)
- Atsushi Taninaka
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan.
| | - Shoji Yoshida
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan.
| | - Yoshihiro Sugita
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan.
| | - Osamu Takeuchi
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan.
| | - Hidemi Shigekawa
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan.
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24
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McGuire J, Miras HN, Richards E, Sproules S. Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals. Chem Sci 2019; 10:1483-1491. [PMID: 30809365 PMCID: PMC6354843 DOI: 10.1039/c8sc04500c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 11/21/2018] [Indexed: 01/24/2023] Open
Abstract
A bis(dithiolene)gold complex is presented as a model for an organic molecular electron spin qubit attached to a metallic surface that acts as a conduit to electrically address the qubit. A two-membered electron transfer series is developed of the formula [AuIII(adt)2]1-/0, where adt is a redox-active dithiolene ligand that is sequentially oxidized as the series is traversed while the central metal ion remains AuIII and steadfastly square planar. One-electron oxidation of diamagnetic [AuIII(adt)2]1- (1) produces an S = 1/2 charge-neutral complex, [AuIII(adt2 3-˙)] (2) which is spectroscopically and theoretically characterized with a near negligible Au contribution to the ground state. A phase memory time (T M) of 21 μs is recorded in 4 : 1 CS2/CCl4 at 10 K, which is the longest ever reported for a coordination complex possessing a third-row transition metal ion. With increasing temperature, T M dramatically decreases becoming unmeasurable above 80 K as a consequence of the diminishing spin-lattice (T 1) relaxation time fueled by spin-orbit coupling. These relaxation times are 1-2 orders of magnitude shorter for the solid dilution of 2 in isoelectronic [Ni(adt)2] because this material is a molecular semiconductor. Although the conducting properties of this material provide efficient pathways to dissipate the energy through the lattice, it can also be used to electrically address the paramagnetic dopant by tapping into the mild reduction potential to switch magnetism "on" and "off" in the gold complex without compromising the integrity of its structure. These results serve to highlight the need to consider all components of these spintronic assemblies.
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Affiliation(s)
- Jake McGuire
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK .
| | - Haralampos N Miras
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK .
| | - Emma Richards
- School of Chemistry , Cardiff University , Main Building, Park Place , Cardiff , CF10 3AT , UK
| | - Stephen Sproules
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK .
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Kobayashi S, Kaneko S, Fujii S, Nishino T, Tsukagoshi K, Kiguchi M. Stretch dependent electronic structure and vibrational energy of the bipyridine single molecule junction. Phys Chem Chem Phys 2019; 21:16910-16913. [DOI: 10.1039/c9cp01442j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Change in the molecular orbital energy and vibrational energy of the bipyridine single molecule junction as a function of stretch distance.
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Affiliation(s)
- S. Kobayashi
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - S. Kaneko
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - S. Fujii
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - T. Nishino
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - K. Tsukagoshi
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science
- Tsukuba
- Japan
| | - M. Kiguchi
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro-ku
- Japan
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26
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27
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Aiba A, Iwane M, Fujii S, Kiguchi M. Electronic Properties of Single Atom and Molecule Junctions. ChemElectroChem 2018. [DOI: 10.1002/celc.201800787] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Akira Aiba
- Department of chemistryTokyo institute of technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551
| | - Madoka Iwane
- Department of chemistryTokyo institute of technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551
| | - Shintaro Fujii
- Department of chemistryTokyo institute of technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551
| | - Manabu Kiguchi
- Department of chemistryTokyo institute of technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551
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Bhattacharya B, Mondal R, Sarkar U. The spin filtering effect and negative differential behavior of the graphene-pentalene-graphene molecular junction: a theoretical analysis. J Mol Model 2018; 24:278. [PMID: 30209667 DOI: 10.1007/s00894-018-3818-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 08/30/2018] [Indexed: 11/28/2022]
Abstract
Density functional theory (DFT) combined with nonequilibrium Green's function (NEGF) formalism are used to investigate the effects of substitutional doping by nitrogen and sulfur on transport properties of AGNR-pentalene-AGNR nanojunction. A considerable spin filtering capability in a wide bias range is observed for all systems, which may have potential application in spintronics devices. Moreover, all model devices exhibit a negative differential effect with considerable peak-to-valley ratio. Thus, our findings provide a way to produce multifunctional spintronic devices based on nitrogen and sulfur doped pentalene-AGNR nanojunctions. The underlying mechanism for this interesting behavior was exposed by analyzing the transmission spectrum as well as the electrostatic potential distribution. In addition, a system doped with an odd number of dopant shows a rectifying efficiency comparable to other systems. The above findings strongly imply that such a multifunctional molecular device would be a useful candidate for molecular electronics. Graphical abstract The graphene-pentalene-graphene molecular junction.
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Affiliation(s)
| | - Rajkumar Mondal
- Department of Physics, Assam University, Silchar, 788011, India
| | - Utpal Sarkar
- Department of Physics, Assam University, Silchar, 788011, India.
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HARASHIMA T, HASEGAWA Y, KIGUCHI M, NISHINO T. Evaluation of the Kinetic Property of Single-Molecule Junctions by Tunneling Current Measurements. ANAL SCI 2018; 34:639-641. [DOI: 10.2116/analsci.18c011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Takanori HARASHIMA
- Department of Chemistry, School of Science, Tokyo Institute of Technology
| | - Yusuke HASEGAWA
- Department of Chemistry, School of Science, Tokyo Institute of Technology
| | - Manabu KIGUCHI
- Department of Chemistry, School of Science, Tokyo Institute of Technology
| | - Tomoaki NISHINO
- Department of Chemistry, School of Science, Tokyo Institute of Technology
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30
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Huang ML, Zhang F, Wang C, Zheng JF, Mao HL, Xie HJ, Shao Y, Zhou XS, Liu JX, Zhuang JL. Side-Group Effect on Electron Transport of Single Molecular Junctions. MICROMACHINES 2018; 9:E234. [PMID: 30424167 PMCID: PMC6187264 DOI: 10.3390/mi9050234] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/09/2018] [Accepted: 05/10/2018] [Indexed: 11/23/2022]
Abstract
In this article, we have investigated the influence of the nitro side-group on the single molecular conductance of pyridine-based molecules by scanning tunneling microscopy break junction. Single molecular conductance of 4,4'-bipyridine (BPY), 3-nitro-4-(pyridin-4-yl)pyridine (BPY-N), and 3-nitro-4-(3-nitropyridin-4-yl)pyridine (BPY-2N) were measured by contact with Au electrodes. For the BPY molecular junction, two sets of conductance were found with values around 10-3.1 G₀ (high G) and 10-3.7 G₀ (low G). The addition of nitro side-group(s) onto the pyridine ring resulted in lower conductance of 10-3.8 G₀ for BPY-N and 10-3.9 G₀ for BPY-2N, respectively, which can be attributed to the twist angle of two pyridine rings. Moreover, the steric hindrance of nitro group(s) also affects the contacting configuration of electrode-molecule-electrode. As a consequence, only one set of conductance value was observed for BPY-N and BPY-2N. Our work clearly shows the important role of side-groups on the electron transport of single-molecule junctions.
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Affiliation(s)
- Miao-Ling Huang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Fan Zhang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Chen Wang
- Key Lab for Functional Materials Chemistry of Guizhou Province, School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China.
| | - Ju-Fang Zheng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Hui-Ling Mao
- Key Lab for Functional Materials Chemistry of Guizhou Province, School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China.
| | - Hu-Jun Xie
- Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310018, China.
| | - Yong Shao
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Xiao-Shun Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Jin-Xuan Liu
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, Dalian 116024, China.
| | - Jin-Liang Zhuang
- Key Lab for Functional Materials Chemistry of Guizhou Province, School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China.
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31
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Dependence of Stretch Length on Electrical Conductance and Electronic Structure of the Benzenedithiol Single Molecular Junction. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2018. [DOI: 10.1380/ejssnt.2018.145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Photochemical Reaction Using Aminobenzenethiol Single Molecular Junction. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2018. [DOI: 10.1380/ejssnt.2018.137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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33
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Zheng J, Liu J, Zhuo Y, Li R, Jin X, Yang Y, Chen ZB, Shi J, Xiao Z, Hong W, Tian ZQ. Electrical and SERS detection of disulfide-mediated dimerization in single-molecule benzene-1,4-dithiol junctions. Chem Sci 2018; 9:5033-5038. [PMID: 29938032 PMCID: PMC5994741 DOI: 10.1039/c8sc00727f] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 04/30/2018] [Indexed: 01/21/2023] Open
Abstract
Electrical and in situ SERS characterization of the benzene-1,4-dithiol (BDT) junction suggested that dimerization of BDT contributed to the low conductance.
We applied a combination of mechanically controllable break junction (MCBJ) and in situ surface enhanced Raman spectroscopy (SERS) methods to investigate the long-standing single-molecule conductance discrepancy of prototypical benzene-1,4-dithiol (BDT) junctions. Single-molecule conductance characterization, together with configuration analysis of the molecular junction, suggested that disulfide-mediated dimerization of BDT contributed to the low conductance feature, which was further verified by the detection of S–S bond formation through in situ SERS characterization. Control experiments demonstrated that the disulfide-mediated dimerization could be tuned via the chemical inhibitor. Our findings suggest that a combined electrical and SERS method is capable of probing chemical reactions at the single-molecule level.
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Affiliation(s)
- Jueting Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Junyang Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Yijing Zhuo
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Ruihao Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Xi Jin
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Yang Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Zhao-Bin Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Jia Shi
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Zongyuan Xiao
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
| | - Zhong-Qun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Pen-Tung Sah Institute of Micro-Nano Science and Technology , Graphene Industry and Engineering Research Institute , iChEM , Xiamen University , Xiamen 361005 , China . ;
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34
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Komoto Y, Yamazaki Y, Tamaki Y, Iwane M, Nishino T, Ishitani O, Kiguchi M, Fujii S. Ruthenium Tris-bipyridine Single-Molecule Junctions with Multiple Joint Configurations. Chem Asian J 2018. [DOI: 10.1002/asia.201800166] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yuuki Komoto
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Yasuomi Yamazaki
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Yusuke Tamaki
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Madoka Iwane
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Tomoaki Nishino
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Osamu Ishitani
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Manabu Kiguchi
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Shintaro Fujii
- Department of Chemistry; Graduate School of Science; Tokyo Institute of Technology; 2-12-1 W4-10 Ookayama, Meguro-ku Tokyo 152-8551 Japan
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35
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Zhao Z, Liu R, Mayer D, Coppola M, Sun L, Kim Y, Wang C, Ni L, Chen X, Wang M, Li Z, Lee T, Xiang D. Shaping the Atomic-Scale Geometries of Electrodes to Control Optical and Electrical Performance of Molecular Devices. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1703815. [PMID: 29542239 DOI: 10.1002/smll.201703815] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 02/16/2018] [Indexed: 05/27/2023]
Abstract
A straightforward method to generate both atomic-scale sharp and atomic-scale planar electrodes is reported. The atomic-scale sharp electrodes are generated by precisely stretching a suspended nanowire, while the atomic-scale planar electrodes are obtained via mechanically controllable interelectrodes compression followed by a thermal-driven atom migration process. Notably, the gap size between the electrodes can be precisely controlled at subangstrom accuracy with this method. These two types of electrodes are subsequently employed to investigate the properties of single molecular junctions. It is found, for the first time, that the conductance of the amine-linked molecular junctions can be enhanced ≈50% as the atomic-scale sharp electrodes are used. However, the atomic-scale planar electrodes show great advantages to enhance the sensitivity of Raman scattering upon the variation of nanogap size. The underlying mechanisms for these two interesting observations are clarified with the help of density functional theory calculation and finite-element method simulation. These findings not only provide a strategy to control the electron transport through the molecule junction, but also pave a way to modulate the optical response as well as to improve the stability of single molecular devices via the rational design of electrodes geometries.
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Affiliation(s)
- Zhikai Zhao
- Key Laboratory of Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Nankai, 300071, China
| | - Ran Liu
- School of Physics and Electronics, Shandong Normal University, Jinan, 250014, China
| | - Dirk Mayer
- Peter-Grünberg-Institute PGI-8, Bioelectronic Research Center Jülich GmbH and JARA, Fundamentals of Future Information Technology, Jülich, 52425, Germany
| | - Maristella Coppola
- Peter-Grünberg-Institute PGI-8, Bioelectronic Research Center Jülich GmbH and JARA, Fundamentals of Future Information Technology, Jülich, 52425, Germany
| | - Lu Sun
- Key Laboratory of Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Nankai, 300071, China
| | - Youngsang Kim
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Chuankui Wang
- School of Physics and Electronics, Shandong Normal University, Jinan, 250014, China
| | - Lifa Ni
- Key Laboratory of Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Nankai, 300071, China
| | - Xing Chen
- Penn State Department of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, PA, 16802, USA
| | - Maoning Wang
- Key Laboratory of Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Nankai, 300071, China
| | - Zongliang Li
- School of Physics and Electronics, Shandong Normal University, Jinan, 250014, China
| | - Takhee Lee
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Korea
| | - Dong Xiang
- Key Laboratory of Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Nankai, 300071, China
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36
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Bi H, Palma CA, Gong Y, Hasch P, Elbing M, Mayor M, Reichert J, Barth JV. Voltage-Driven Conformational Switching with Distinct Raman Signature in a Single-Molecule Junction. J Am Chem Soc 2018; 140:4835-4840. [DOI: 10.1021/jacs.7b12818] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hai Bi
- Physics Department E20, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Carlos-Andres Palma
- Physics Department E20, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, P.R. China
| | - Yuxiang Gong
- Physics Department E20, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Peter Hasch
- Physics Department E20, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Mark Elbing
- Department of Applied Natural Sciences, Lübeck University of Applied Sciences, Mönkhofer Weg 239, 23562 Lübeck, Germany
| | - Marcel Mayor
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Karlsruhe, Germany
- Department of Chemistry, University of Basel, St Johannsring 19, CH-4056 Basel, Switzerland
| | - Joachim Reichert
- Physics Department E20, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Johannes V. Barth
- Physics Department E20, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
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37
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Sato S, Iwase S, Namba K, Ono T, Hara K, Fukuoka A, Uosaki K, Ikeda K. Electrical Matching at Metal/Molecule Contacts for Efficient Heterogeneous Charge Transfer. ACS NANO 2018; 12:1228-1235. [PMID: 29323878 DOI: 10.1021/acsnano.7b07223] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In a metal/molecule hybrid system, unavoidable electrical mismatch exists between metal continuum states and frontier molecular orbitals. This causes energy loss in the electron conduction across the metal/molecule interface. For efficient use of energy in a metal/molecule hybrid system, it is necessary to control interfacial electronic structures. Here we demonstrate that electrical matching between a gold substrate and π-conjugated molecular wires can be obtained by using monatomic foreign metal interlayers, which can change the degree of d-π* back-donation at metal/anchor contacts. This interfacial control leads to energy level alignment between the Fermi level of the metal electrode and conduction molecular orbitals, resulting in resonant electron conduction in the metal/molecule hybrid system. When this method is applied to molecule-modified electrocatalysts, the heterogeneous electrochemical reaction rate is considerably improved with significant suppression of energy loss at the internal electron conduction.
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Affiliation(s)
- Shino Sato
- Graduate School of Chemical Sciences and Engineering, Hokkaido University , Sapporo 060-0810, Japan
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
| | - Shigeru Iwase
- Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba 305-8571, Japan
| | - Kotaro Namba
- Graduate School of Chemical Sciences and Engineering, Hokkaido University , Sapporo 060-0810, Japan
| | - Tomoya Ono
- Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba 305-8571, Japan
- Center for Computational Sciences, University of Tsukuba , Tsukuba 305-8577, Japan
| | - Kenji Hara
- Department of Applied Chemistry, School of Engineering, Tokyo University of Technology , 1404-1 Katakura, Hachioji, Tokyo 060-0810, Japan
| | - Atsushi Fukuoka
- Institute for Catalysis, Hokkaido University , Sapporo 001-0021, Japan
| | - Kohei Uosaki
- Graduate School of Chemical Sciences and Engineering, Hokkaido University , Sapporo 060-0810, Japan
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
| | - Katsuyoshi Ikeda
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
- Frontier Research Institute for Materials Science (FRIMS), Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
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38
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Isshiki Y, Matsuzawa Y, Fujii S, Kiguchi M. Investigation on Single-Molecule Junctions Based on Current⁻Voltage Characteristics. MICROMACHINES 2018; 9:mi9020067. [PMID: 30393343 PMCID: PMC6187306 DOI: 10.3390/mi9020067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 01/30/2018] [Accepted: 01/31/2018] [Indexed: 12/17/2022]
Abstract
The relationship between the current through an electronic device and the voltage across its terminals is a current–voltage characteristic (I–V) that determine basic device performance. Currently, I–V measurement on a single-molecule scale can be performed using break junction technique, where a single molecule junction can be prepared by trapping a single molecule into a nanogap between metal electrodes. The single-molecule I–Vs provide not only the device performance, but also reflect information on energy dispersion of the electronic state and the electron-molecular vibration coupling in the junction. This mini review focuses on recent representative studies on I–Vs of the single molecule junctions that cover investigation on the single-molecule diode property, the molecular vibration, and the electronic structure as a form of transmission probability, and electronic density of states, including the spin state of the single-molecule junctions. In addition, thermoelectronic measurements based on I–Vs and identification of the charged carriers (i.e., electrons or holes) are presented. The analysis in the single-molecule I–Vs provides fundamental and essential information for a better understanding of the single-molecule science, and puts the single molecule junction to more practical use in molecular devices.
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Affiliation(s)
- Yuji Isshiki
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Yuya Matsuzawa
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Shintaro Fujii
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Manabu Kiguchi
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
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39
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KIGUCHI M. Studies on single-molecule bridging metal electrodes: development of new characterization technique and functionalities. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2018; 94:350-359. [PMID: 30416175 PMCID: PMC6275331 DOI: 10.2183/pjab.94.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 09/12/2018] [Indexed: 06/09/2023]
Abstract
A single molecular junction is a nanoscale structure prepared by bridging a single molecule between macroscopic metal electrodes. It has attracted significant attention due to its unique structure and potential applications in ultra-small single molecular electronic devices. It has two metal-molecule interfaces, and thus the electronic structure of the molecule can be significantly modulated from its original one. The single molecular junction can be regarded as a new material that includes metal electrodes, a so-called "double interface material". Therefore, we can expect unconventional physical and chemical properties. To develop a better understanding of the properties and functionalities of single molecular junctions, their atomic and electronic structures should be characterized. In this review, we describe the development of these characterization techniques, such as inelastic electron tunneling spectroscopy, surface-enhanced Raman scattering, as well as shot noise and thermopower measurements. We have also described some unique properties and functionalities of single molecular junctions, such as switching and diode properties.
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Affiliation(s)
- Manabu KIGUCHI
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan
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40
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Inagaki M, Motobayashi K, Ikeda K. Electrochemical THz-SERS Observation of Thiol Monolayers on Au(111) and (100) Using Nanoparticle-assisted Gap-Mode Plasmon Excitation. J Phys Chem Lett 2017; 8:4236-4240. [PMID: 28830138 DOI: 10.1021/acs.jpclett.7b01901] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Surface-enhanced Raman scattering (SERS) microscopy using nanoparticle-assisted gap-mode plasmon excitation, which enables us to observe an atomically defined planar metal surface, was combined with THz-Raman spectroscopy to observe ultra-low-frequency vibration modes under electrochemical conditions. This combination helps us to gain deeper insights into electrode/electrolyte interfaces via direct observation of extramolecular vibrations including information on intermolecular and substrate/molecule interactions. Electrochemical reductive desorption of benzenethiol derivatives from Au(111) and (100) was monitored to demonstrate the power of this spectroscopy. Structural differences of the monolayers between these surfaces were seen only in the extramolecular vibration modes such as a large-amplitude hinge-bending motion of the phenyl ring. On the Au(111), where hollow-site and bridge-site adsorption coexisted, the electrochemical reductive desorption was preferentially induced at the hollow sites.
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Affiliation(s)
- Motoharu Inagaki
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Nagoya 466-8555, Japan
| | - Kenta Motobayashi
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Nagoya 466-8555, Japan
| | - Katsuyoshi Ikeda
- Department of Physical Science and Engineering, Nagoya Institute of Technology , Nagoya 466-8555, Japan
- Frontier Research Institute for Materials Science (FRIMS), Nagoya Institute of Technology , Nagoya 466-8555, Japan
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan
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41
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Surface-Enhanced Raman Scattering in Molecular Junctions. SENSORS 2017; 17:s17081901. [PMID: 28820430 PMCID: PMC5580101 DOI: 10.3390/s17081901] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 08/11/2017] [Accepted: 08/16/2017] [Indexed: 01/25/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is a surface-sensitive vibrational spectroscopy that allows Raman spectroscopy on a single molecular scale. Here, we present a review of SERS from molecular junctions, in which a single molecule or molecules are made to have contact from the top to the bottom of metal surfaces. The molecular junctions are nice platforms for SERS as well as transport measurement. Electronic characterization based on the transport measurements of molecular junctions has been extensively studied for the development of miniaturized electronic devices. Simultaneous SERS and transport measurement of the molecular junctions allow both structural (geometrical) and electronic information on the single molecule scale. The improvement of SERS measurement on molecular junctions open the door toward new nanoscience and nanotechnology in molecular electronics.
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Controlling the thermoelectric effect by mechanical manipulation of the electron's quantum phase in atomic junctions. Sci Rep 2017; 7:7949. [PMID: 28801557 PMCID: PMC5554135 DOI: 10.1038/s41598-017-08553-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 07/13/2017] [Indexed: 11/08/2022] Open
Abstract
The thermoelectric voltage developed across an atomic metal junction (i.e., a nanostructure in which one or a few atoms connect two metal electrodes) in response to a temperature difference between the electrodes, results from the quantum interference of electrons that pass through the junction multiple times after being scattered by the surrounding defects. Here we report successfully tuning this quantum interference and thus controlling the magnitude and sign of the thermoelectric voltage by applying a mechanical force that deforms the junction. The observed switching of the thermoelectric voltage is reversible and can be cycled many times. Our ab initio and semi-empirical calculations elucidate the detailed mechanism by which the quantum interference is tuned. We show that the applied strain alters the quantum phases of electrons passing through the narrowest part of the junction and hence modifies the electronic quantum interference in the device. Tuning the quantum interference causes the energies of electronic transport resonances to shift, which affects the thermoelectric voltage. These experimental and theoretical studies reveal that Au atomic junctions can be made to exhibit both positive and negative thermoelectric voltages on demand, and demonstrate the importance and tunability of the quantum interference effect in the atomic-scale metal nanostructures.
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Aiba A, Kaneko S, Fujii S, Nishino T, Tsukagoshi K, Kiguchi M. In situ observation of the formation process for free-standing Au nanowires with a scanning electron microscope. NANOTECHNOLOGY 2017; 28:105707. [PMID: 28169228 DOI: 10.1088/1361-6528/aa59f0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have developed a simultaneous electronic and structural characterization method for studying the formation process for Au nanowires. The method is based on two-probe electronic transport measurement of free-standing Au nanowires and simultaneous structural characterization using scanning electron microscopy (SEM). We measured the electronic currents during the electromigration (EM)-induced narrowing process for the free-standing Au nanowires. A free-standing Au nanowire with a desired conductance value was fabricated by EM. Simultaneous SEM and conductance measurements revealed the EM-induced narrowing process for the Au wires, in which material transfer in the nanowires caused growth towards the positively biased electrode and contact failure at the negatively biased electrode. The narrowed free-standing Au nanowires were stable and could be maintained for more than 10 h without their conductance changing. These results indicate the high stability of the EM-processed Au nanowires compared to Au nanowires fabricated by mechanical elongation or the breaking of Au nanocontacts.
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Affiliation(s)
- Akira Aiba
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 W4-10, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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44
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Li Y, Kaneko S, Fujii S, Nishino T, Kiguchi M. Atomic structure of water/Au, Ag, Cu and Pt atomic junctions. Phys Chem Chem Phys 2017; 19:4673-4677. [PMID: 28125112 DOI: 10.1039/c6cp07549e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Much progress has been made in understanding the transport properties of atomic-scale conductors. We prepared atomic-scale metal contacts of Cu, Ag, Au and Pt using a mechanically controllable break junction method at 10 K in a cryogenic vacuum. Water molecules were exposed to the metal atomic contacts and the effect of molecular adsorption was investigated by electronic conductance measurements. Statistical analysis of the electronic conductance showed that the water molecule(s) interacted with the surface of the inert Au contact and the reactive Cu ant Pt contacts, where molecular adsorption decreased the electronic conductance. A clear conductance signature of water adsorption was not apparent at the Ag contact. Detailed analysis of the conductance behaviour during a contact-stretching process indicated that metal atomic wires were formed for the Au and Pt contacts. The formation of an Au atomic wire consisting of low coordination number atoms leads to increased reactivity of the inert Au surface towards the adsorption of water.
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Affiliation(s)
- Yu Li
- Department of Chemistry, Graduate School of Science and Engineering, Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Satoshi Kaneko
- Department of Chemistry, Graduate School of Science and Engineering, Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Shintaro Fujii
- Department of Chemistry, Graduate School of Science and Engineering, Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Tomoaki Nishino
- Department of Chemistry, Graduate School of Science and Engineering, Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
| | - Manabu Kiguchi
- Department of Chemistry, Graduate School of Science and Engineering, Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
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45
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Komoto Y, Isshiki Y, Fujii S, Nishino T, Kiguchi M. Evaluation of the Electronic Structure of Single-Molecule Junctions Based on Current-Voltage and Thermopower Measurements: Application to C 60 Single-Molecule Junction. Chem Asian J 2017; 12:440-445. [PMID: 28035743 DOI: 10.1002/asia.201601392] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 12/28/2016] [Indexed: 11/06/2022]
Abstract
The electronic structure of molecular junctions has a significant impact on their transport properties. Despite the decisive role of the electronic structure, a complete characterization of the electronic structure remains a challenge. This is because there is no straightforward way of measuring electron spectroscopy for an individual molecule trapped in a nanoscale gap between two metal electrodes. Herein, a comprehensive approach to obtain a detailed description of the electronic structure in single-molecule junctions based on the analysis of current-voltage (I-V) and thermoelectric characteristics is described. It is shown that the electronic structure of the prototypical C60 single-molecule junction can be resolved by analyzing complementary results of the I-V and thermoelectric measurement. This combined approach confirmed that the C60 single-molecule junction was highly conductive with molecular electronic conductances of 0.033 and 0.003 G0 and a molecular Seebeck coefficient of -12 μV K-1 . In addition, we revealed that charge transport was mediated by a LUMO whose energy level was located 0.5≈0.6 eV above the Fermi level of the Au electrode.
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Affiliation(s)
- Yuki Komoto
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Yuji Isshiki
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Shintaro Fujii
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Tomoaki Nishino
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Manabu Kiguchi
- Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
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46
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Kiguchi M, Fujii S. Governing the Metal–Molecule Interface: Towards New Functionality in Single-Molecule Junctions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160229] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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47
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Naitoh Y, Albrecht K, Wei Q, Yamamoto K, Shima H, Ishida T. Fabrication of sub-1 nm gap electrodes using metal-mask patterning and conductivity measurements of molecules in nanoscale spaces. RSC Adv 2017. [DOI: 10.1039/c7ra10873g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fabrications of sub-1 nm gap Au electrodes using a metal mask for patterning were achieved. Because the procedure does not involve wet processing, the ranges of possible electrode and substrate materials for the electrodes are greatly expanded.
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Affiliation(s)
- Yasuhisa Naitoh
- Nanoelectronics Research Institute
- Department of Electronics and Manufacturing
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Ken Albrecht
- Laboratory for Chemistry and Life Science
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- JST
| | - Qingshuo Wei
- Nanomaterials Research Institute
- Department of Materials and Chemistry
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Kimihisa Yamamoto
- Laboratory for Chemistry and Life Science
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- JST
| | - Hisashi Shima
- Nanoelectronics Research Institute
- Department of Electronics and Manufacturing
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Takao Ishida
- Nanomaterials Research Institute
- Department of Materials and Chemistry
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
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48
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Kaneko S, Takahashi R, Fujii S, Nishino T, Kiguchi M. Controlling the formation process and atomic structures of single pyrazine molecular junction by tuning the strength of the metal–molecule interaction. Phys Chem Chem Phys 2017; 19:9843-9848. [DOI: 10.1039/c6cp08862g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fabrication of single pyrazine molecular junction with Au, Ag and Cu electrodes using mechanically controllable break junction technique in ultra-high vacuum.
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Affiliation(s)
- Satoshi Kaneko
- Department of Chemistry
- Graduate School of Science
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Ryoji Takahashi
- Department of Chemistry
- Graduate School of Science
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Shintaro Fujii
- Department of Chemistry
- Graduate School of Science
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Tomoaki Nishino
- Department of Chemistry
- Graduate School of Science
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Manabu Kiguchi
- Department of Chemistry
- Graduate School of Science
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
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49
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Tschudi SE, Reuter MG. Estimating the Landauer-Büttiker transmission function from single molecule break junction experiments. NANOTECHNOLOGY 2016; 27:425203. [PMID: 27623441 DOI: 10.1088/0957-4484/27/42/425203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
When investigating the electronic response properties of molecules, experiments often measure conductance whereas computation predicts the transmission probability. Although Landauer-Büttiker theory usually relates the two, comparison between experiment and computation remains difficult because experimental data (specifically those from break junctions) are statistical and computational results are deterministic. In this work we develop tools to quantitatively estimate-with error bars-the shape of the Landauer-Büttiker transmission function directly from experimental statistics on conductance and thermopower (if the latter is also available). We subsequently apply these tools to existing data, demonstrating a rigorous statistical comparison between experimental and computational results on molecular electron transport.
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Affiliation(s)
- Stephen E Tschudi
- Department of Applied Mathematics & Statistics and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, NY 11794, USA
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50
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Takahashi R, Kaneko S, Marqués-González S, Fujii S, Nishino T, Tsukagoshi K, Kiguchi M. Determination of the number of atoms present in nano contact based on shot noise measurements with highly stable nano-fabricated electrodes. NANOTECHNOLOGY 2016; 27:295203. [PMID: 27291763 DOI: 10.1088/0957-4484/27/29/295203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A highly stable experimental setup was developed for the measurement of shot noise in atomic contacts and molecular junctions to determine the number of atoms or molecules present. The use of a nano-fabricated mechanically controllable break junction (MCBJ) electrode improved the overall stability of the experimental setup. The improved stability of the system and optimization of measurement system enabled us to comprehensively investigate the shot noise as well as charge transport properties in Au atomic contacts and molecular junctions. We present a solid proof that the number of atoms (cross sectional atom) in the Au atomic contacts was exactly one. In the atomic contacts, contribution from the additional channels was under the detection limit. Furthermore, the effect of molecular adsorption on the charge transport in the Au atomic contact was investigated. Additional transport channels were opened by exposing pyrazine molecules to the Au contacts, which gave rise to an increase in the Fano factor in the shot noise.
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Affiliation(s)
- Ryoji Takahashi
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 W4-10, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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