Surface Enhanced Raman Scattering, in Situ Spectro-Electrochemical, and Electrochemical Impedance Spectroscopic Investigations of 2-Amino-5-mercapto-1,3,4-thiadiazole Monolayers at a Silver Electrode

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• 作者：Haifeng Yang ; Xiaojing Sun ; Jun Zhu ; Jiahua Ji ; Xiaoling Ma ; Zongrang Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：June 7, 2007
• 年：2007
• 卷：111
• 期：22
• 页码：7986 - 7991
• 全文大小：180K
• 年卷期：v.111,no.22(June 7, 2007)
• ISSN：1932-7455

文摘

At a silver surface, surface-enhanced Raman scattering (SERS) technique along with the self-assembledmonolayers (SAMs) method was performed to observe the adsorption behavior of AMT as a protective reagentfor metals from corrosion. For 20 h of self-assembling, the time-dependent SERS spectra show that a stableAMT monolayers could form and the ultimate structure of AMT monolayers anchoring at the surface is intilted mode via both sulfur atoms of thiol and thiadiazole ring with the nitrogen atom of amino. In situ SERSspectral electrochemical experiments indicate that the AMT monolayers experience an dynamic adsorptionfrom a tilted fashion to a more horizontal mode for thiadiazole ring with the potential applied toward morenegative voltage. Anticorrosive effect of the AMT monlayers has been ascertained by electrochemicalimpedance spectroscopy, which is in agreement with theoretic evaluation of the R(Q(R(QR))) mode.