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