Electrochemical and SERS spectroscopic investigations of 4-methyl-4H-1,2,4-triazole-3-thiol monolayers self-assembled on copper surface |
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Authors: | Ying-Cheng PanYing Wen Rui ZhangYing-Ying Wang Zong-Rang ZhangHai-Feng Yang |
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Affiliation: | Department of Chemistry, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China |
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Abstract: | Electrochemically anticorrosive behaviors of 4-methyl-4H-1,2,4-triazole-3-thiol (4-MTTL) monolayers self-assembled on copper surface have been investigated by electrochemical impedance spectroscopy (EIS), electrochemical polarization measurement and surface-enhanced Raman scattering (SERS) spectroscopy. The EIS mechanism of the copper surface adsorbed with 4-MTTL monolayers was fitted with the mode of R(QR)(QR)(CR). The electrochemical polarization experimental results indicated the high inhibitive efficiency of about 81.1%. Potential dependent SERS result suggests that 4-MTTL molecule was anchored at the copper surface via S6 and N2 atoms with a tilted orientation, which resulting in a strong interaction between the 4-MTTL molecule and copper surface. The molecule tended to experience a transition state of the adsorption at the copper surface via S6 atom only as the potential applied at −0.5 V vs. SCE. |
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Keywords: | 4-Methyl-4H-1 2 4-triazole-3-thiol Copper Self-assembled monolayers Surface-enhanced Raman scattering Electrochemistry |
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