Abstract：Surface-enhanced Raman scattering (SERS) of thiosalicylic acid (TSA) with sulfydryl group was investigated on the surface of electrochemically roughed silver electrode. The result shows that SERS enhancement effect was relative to the concentration and pH, and 1×10-3 mol·L-1 and pH 4 were the optimal condition. While the concentration increased, the enhancement effect decreased quickly because of steric hindrance. S—Ag peak position by the absorption of TSA was basically consistent, but pH significantly affected its intensity. The distribution and mechanism of TSA at different pH were further investigated. It was showed that TSA was adsorbed on the active silver surface via the sulfydryl group without H of neutral C6H4(COOH)SH molecule. Competitive adsorption of negative valence C6H4(COO-)SH and OH- may bring non-SERS under the strong base condition. At the same time, the sulfydryl group significantly influenced the carboxyl vibration peak’s change and the distribution of electron cloud of benzene ring conjugate system.
刘文涵，袁荣辉，滕渊洁，秦延平，潘再法，马淳安 . 硫代水杨酸在银表面的化学吸附及其表面增强拉曼光谱研究 [J]. 光谱学与光谱分析, 2013, 33(09): 2433-2437.
LIU Wen-han, YUAN Rong-hui, TENG Yuan-jie, QIN Yan-ping, PAN Zai-fa, MA Chun-an . Chemical Adsorption of Thiosalicylic Acid on Silver Surface Investigated by Surface-Enhanced Raman Scattering . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(09): 2433-2437.
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