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Rauh F, Dittloff J, Thun M, Stutzmann M, Sharp ID. Nanostructured Black Silicon as a Stable and Surface-Sensitive Platform for Time-Resolved In Situ Electrochemical Infrared Absorption Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2024; 16:6653-6664. [PMID: 38267016 PMCID: PMC10859962 DOI: 10.1021/acsami.3c17294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 12/20/2023] [Accepted: 12/22/2023] [Indexed: 01/26/2024]
Abstract
Attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) is a powerful method for probing interfacial chemical processes. However, SEIRAS-active nanostructured metallic thin films for the in situ analysis of electrochemical phenomena are often unstable under biased aqueous conditions. In this work, we present a surface-enhancing structure based on etched black Si internal reflection elements with Au-coatings for in situ electrochemical ATR-SEIRAS. Using electrochemical potential-dependent adsorption and desorption of 4-methoxypyridine on Au, we demonstrate that black Si-based substrates offer advantages over commonly used structures, such as electroless-deposited Au on Si and electrodeposited Au on ITO-coated Si, due to the combination of high stability, sensitivity, and conductivity. These characteristics are especially valuable for time-resolved measurements where stable substrates are required over extended times. Furthermore, the low sheet resistance of Au layers on black Si reduces the RC time constant of the electrochemical cell, enabling a significantly higher time resolution compared to that of traditional substrates. Thus, we employ black Si-based substrates in conjunction with rapid- and step-scan Fourier transform infrared (FTIR) spectroscopy to investigate the adsorption and desorption kinetics of 4-methoxypyridine during in situ electrochemical potential steps. Adsorption is shown to be diffusion-limited, which allows for the determination of the mean molecular area in a fully established monolayer. Moreover, no significant changes in the peak ratios of vibrational modes with different orientations relative to the molecular axis are observed, suggesting a single adsorption mode and no alteration of the average molecular orientation during the adsorption process. Overall, this study highlights the enhanced performance of black Si-based substrates for both steady-state and time-resolved in situ electrochemical ATR-SEIRAS, providing a powerful platform for kinetic and mechanistic investigations of electrochemical interfaces.
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Affiliation(s)
- Felix Rauh
- Walter
Schottky Institute, Technical University
of Munich, 85748 Garching, Germany
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Johannes Dittloff
- Walter
Schottky Institute, Technical University
of Munich, 85748 Garching, Germany
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Moritz Thun
- Walter
Schottky Institute, Technical University
of Munich, 85748 Garching, Germany
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Martin Stutzmann
- Walter
Schottky Institute, Technical University
of Munich, 85748 Garching, Germany
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Ian D. Sharp
- Walter
Schottky Institute, Technical University
of Munich, 85748 Garching, Germany
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
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Ion beam sputtering deposition of silver nanoparticles and TiOx/ZnO nanocomposites for use in surface enhanced vibrational spectroscopy (SERS and SEIRAS). Mikrochim Acta 2018; 185:153. [DOI: 10.1007/s00604-018-2708-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/25/2018] [Indexed: 11/25/2022]
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Tong SF, Noguchi H, Masuda T, Uosaki K. Direct proof of potential dependent oxygen adsorption on a gold electrode surface by electrochemical quartz crystal microbalance. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2013.05.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Distortion of the amide-I and -II bands of an α-helical membrane protein, pharaonis halorhodopsin, depends on thickness of gold films utilized for surface-enhanced infrared absorption spectroscopy. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2012.11.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Miller EN, Palm DC, De Silva D, Parbatani A, Meyers AR, Williams DL, Thompson DE. Microsphere Lithography on Hydrophobic Surfaces for Generating Gold Films that Exhibit Infrared Localized Surface Plasmon Resonances. J Phys Chem B 2013; 117:15313-8. [DOI: 10.1021/jp403439e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Emily N. Miller
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
| | - Dustin C. Palm
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
| | - Deepthika De Silva
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
| | - Asish Parbatani
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
| | - Adam R. Meyers
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
| | - Darren L. Williams
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
| | - David E. Thompson
- Department of Chemistry, Sam Houston State University, P.O. Box 2117, Huntsville, Texas 77341,
United States
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