Reversible adsorption change of 2‐amino‐4,5‐imidazoledicarbonitrile on Ag electrode surfaces by potential‐dependent surface‐enhanced Raman scattering |
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| Authors: | Yun Hee Jang Sungu Hwang Keunchang Cho Manho Lim Taiha Joo Suhee Choi Jongwon Kim Sang‐Woo Joo |
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| Institution: | 1. Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500‐712, Korea;2. BK21 Nano Fusion Technology Team, Pusan National University, Miryang 627‐706, Korea;3. Department of Chemistry, Soongsil University, Seoul 156‐743, Korea;4. Department of Chemistry, Pusan National University, Busan 609‐735, Korea;5. Department of Chemistry, Pohang University of Science and Technology, Pohang 790‐784, Korea;6. Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361‐763, Korea |
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| Abstract: | 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. |
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| Keywords: | adsorption 2‐Amino‐4 5‐imidazoledicarbonitrile Ag potential‐dependent SERS DFT calculation |
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