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Reversible adsorption change of 2‐amino‐4,5‐imidazoledicarbonitrile on Ag electrode surfaces by potential‐dependent surface‐enhanced Raman scattering
Author(s) -
Jang Yun Hee,
Hwang Sungu,
Cho Keunchang,
Lim Manho,
Joo Taiha,
Choi Suhee,
Kim Jongwon,
Joo SangWoo
Publication year - 2011
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3626
Subject(s) - adsorption , chemistry , raman scattering , electrode , electrode potential , raman spectroscopy , density functional theory , scattering , metal , nitrile , chemical physics , analytical chemistry (journal) , electrochemistry , computational chemistry , optics , organic chemistry , physics
The potential‐induced adsorption change of 2‐amino‐4,5‐imidazoledicarbonitrile (AIDCN) on Ag electrode surfaces has been examined by surface‐enhanced Raman scattering (SERS) in an applied potential range between −1.0 and 0.2 V. Upon adsorption, AIDCN has a substantial interaction with the Ag metal surfaces via its two nitrile groups. The CN stretching peaks at ∼2200 cm −1 appeared to be more intensified and redshifted at a negative potential. The deconvolution peak analysis of the CN bands at various voltages suggests that there should be a change in binding modes of AIDCN on Ag surfaces. This potential‐dependent orientation change appeared to be reversible. The density functional theory (DFT) calculation of AIDCN on Ag cluster atoms is used to explain its potential‐dependent adsorption. Copyright © 2010 John Wiley & Sons, Ltd.