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Liu CH, Bai RP, Bai Y, Guo Y, Zhang Z. Si(111) electrode/electrolyte interfacial studied by in-situ second harmonic generation. CHINESE J CHEM PHYS 2020. [DOI: 10.1063/1674-0068/cjcp2007129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Cai-he Liu
- Beijing National Laboratory of Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Rui-peng Bai
- Beijing National Laboratory of Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Yu Bai
- Beijing National Laboratory of Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yuan Guo
- Beijing National Laboratory of Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Zhen Zhang
- Beijing National Laboratory of Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
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Bhattacharyya D, Montenegro A, Plymale NT, Dutta C, Lewis NS, Benderskii AV. Vibrational Sum Frequency Generation Spectroscopy Measurement of the Rotational Barrier of Methyl Groups on Methyl-Terminated Silicon(111) Surfaces. J Phys Chem Lett 2019; 10:5434-5439. [PMID: 31442376 DOI: 10.1021/acs.jpclett.9b01487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The methyl-terminated Si(111) surface possesses a 3-fold in-plane symmetry, with the methyl groups oriented perpendicular to the substrate. The propeller-like rotation of the methyl groups is hindered at room temperature and proceeds via 120° jumps between three isoenergetic minima in registry with the crystalline Si substrate. We have used line-shape analysis of polarization-selected vibrational sum frequency generation spectroscopy to determine the rotational relaxation rate of the surface methyl groups and have measured the temperature dependence of the relaxation rate between 20 and 120 °C. By fitting the measured rate to an Arrhenius dependence, we extracted an activation energy (the rotational barrier) of 830 ± 360 cm-1 and an attempt frequency of (2.9 ± 4.2) × 1013 s-1 for the methyl rotation process. Comparison with the harmonic frequency of a methyl group in a 3-fold cosine potential suggests that the hindered rotation occurs via uncorrelated jumps of single methyl groups rather than concerted gear-like rotation.
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Affiliation(s)
- Dhritiman Bhattacharyya
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
| | - Angelo Montenegro
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
| | - Noah T Plymale
- Division of Chemistry and Chemical Engineering, and Beckman Institute , California Institute of Technology , Pasadena , California 91125 , United States
| | - Chayan Dutta
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
| | - Nathan S Lewis
- Division of Chemistry and Chemical Engineering, and Beckman Institute , California Institute of Technology , Pasadena , California 91125 , United States
| | - Alexander V Benderskii
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
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Bian HT, Guo Y, Wang HF. Non-parabolic potential dependence of optical second harmonic generation from the Si(111) electrode/electrolyte interface. Phys Chem Chem Phys 2018; 20:29539-29548. [DOI: 10.1039/c8cp05621h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We performed potential dependent second harmonic generation (SHG) measurements on the Si(111) electrolyte interface at different azimuthal angles and for different polarization combinations.
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Affiliation(s)
- Hong-tao Bian
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Molecular Reaction Dynamics
- Institute of Chemistry
- Chinese Academy of Sciences
- University of Chinese Academy of Sciences
| | - Hong-fei Wang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai
- China
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Arefi HH, Nolan M, Fagas G. Density functional theory with van der waals corrections study of the adsorption of alkyl, alkylthiol, alkoxyl, and amino-alkyl chains on the H:Si(111) surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13255-13265. [PMID: 25260071 DOI: 10.1021/la502488c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Surface modification of silicon with organic monolayers tethered to the surface by different linkers is an important process in realizing future miniaturized electronic and sensor devices. Understanding the roles played by the nature of the linking group and the chain length on the adsorption structures and stabilities of these assemblies is vital to advance this technology. This paper presents a density functional theory (DFT) study of the hydrogen passivated Si(111) surface modified with alkyl chains of the general formula H:Si-(CH2)n-CH2 and H:Si-X-(CH2)n-CH3, where X = NH, O, S and n = (0, 1, 3, 5, 7, 9, 11), at half coverage. For (X)-hexane and (X)-dodecane functionalization, we also examined various coverages up to full monolayer grafting in order to validate the result of half covered surface and the linker effect on the coverage. We find that it is necessary to take into account the van der Waals interaction between the alkyl chains. The strongest binding is for the oxygen linker, followed by S, N, and C, irrespective of chain length. The result revealed that the sequence of the stability is independent of coverage; however, linkers other than carbon can shift the optimum coverage considerably and allow further packing density. For all linkers apart from sulfur, structural properties, in particular, surface-linker-chain angles, saturate to a single value once n > 3. For sulfur, we identify three regimes, namely, n = 0-3, n = 5-7, and n = 9-11, each with its own characteristic adsorption structures. Where possible, our computational results are shown to be consistent with the available experimental data and show how the fundamental structural properties of modified Si surfaces can be controlled by the choice of linking group and chain length.
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Affiliation(s)
- Hadi H Arefi
- Tyndall National Institute, Lee Maltings, and ‡Department of Electrical Engineering, University College Cork , Cork, Ireland
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Shaw SK, Lagutchev A, Dlott DD, Gewirth AA. Sum-Frequency Spectroscopy of Molecular Adsorbates on Low-Index Ag Surfaces: Effects of Azimuthal Rotation. Anal Chem 2008; 81:1154-61. [DOI: 10.1021/ac802332h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Scott K. Shaw
- School of Chemical Sciences, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
| | - Alexei Lagutchev
- School of Chemical Sciences, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
| | - Dana D. Dlott
- School of Chemical Sciences, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
| | - Andrew A. Gewirth
- School of Chemical Sciences, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
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Bunimovich YL, Ge G, Beverly KC, Ries RS, Hood L, Heath JR. Electrochemically programmed, spatially selective biofunctionalization of silicon wires. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:10630-10638. [PMID: 15544395 DOI: 10.1021/la047913h] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A method for the spatially selective biofunctionalization of silicon micro- and nanostructures is reported, and results are presented for both single-crystal silicon (111) or (100) surfaces. An electroactive monolayer of hydroquinone was formed on the surface of H-terminated silicon working electrodes via an olefin reaction with UV-generated surface radicals. Molecules presenting either cyclopentadiene or a thiol group can be immobilized onto the regions where the hydroquinone has been oxidized. Molecular size and crystal orientation are evaluated as important factors that dictate the electrode stability in aqueous solution under anodic potentials. Monolayers composed of smaller molecules on (111) surfaces exhibit the highest packing density and are more effective in preventing anodic oxidation of the underlying substrate. Voltammetry, X-ray photoelectron spectroscopy, and atomic force and fluorescence microscopy are utilized to interrogate the kinetic rates of biofunctionalization, the extent of surface coverage, monolayer quality, and the spatial selectivity of the process.
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Affiliation(s)
- Yuri L Bunimovich
- Caltech Division of Chemistry and Chemical Engineering, MC 127-72, Pasadena, California 91125, USA
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Bodlaki D, Freysz E, Borguet E. Infrared second harmonic generation spectroscopy of Ge(111) interfaces. J Chem Phys 2003. [DOI: 10.1063/1.1578619] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mitchell SA. Photooxidation of Hydrogen-Terminated Si(111) Surfaces Studied by Optical Second Harmonic Generation. J Phys Chem B 2003. [DOI: 10.1021/jp0344489] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. A. Mitchell
- Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
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Fabre B, Lopinski GP, Wayner DDM. Functionalization of Si(111) surfaces with alkyl chains terminated by electrochemically polymerizable thienyl units. Chem Commun (Camb) 2002:2904-5. [PMID: 12478805 DOI: 10.1039/b208446e] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Si(111) surface has been derivatized with a thiophene-terminated alkyl monolayer which was subsequently photoanodically oxidized in the presence of thiophene to yield a strongly adherent and smooth conducting film.
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Affiliation(s)
- Bruno Fabre
- Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
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Mitchell SA, Ward TR, Wayner DDM, Lopinski GP. Charge Trapping at Chemically Modified Si(111) Surfaces Studied by Optical Second Harmonic Generation. J Phys Chem B 2002. [DOI: 10.1021/jp026046r] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- S. A. Mitchell
- Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, K1A 0R6, Canada
| | - T. R. Ward
- Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, K1A 0R6, Canada
| | - D. D. M. Wayner
- Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, K1A 0R6, Canada
| | - G. P. Lopinski
- Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, K1A 0R6, Canada
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Fomenko V, Bodlaki D, Faler C, Borguet E. Second-harmonic generation from chemically modified Ge(111) interfaces. J Chem Phys 2002. [DOI: 10.1063/1.1454242] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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