时间分辨表面增强拉曼光谱(TRSERS)研究硫脲衍生物与ClO4^-的共吸附行为

运用时间分辨表面增强拉曼光谱(TRSERS)结合电位双阶跃的方法, 研究了硫脲衍生物甲基硫脲(MTU)和烯丙基硫脲(ATU)在银电极表面与ClO4^-离子的共吸附行为, SERS强度-时间曲线表明它们各自相应的SERS谱峰强度随电位阶跃的响应速率不同, 离电极表面较近的基团的特征谱峰强度的响应速率较快; MTU以S端且垂直吸附在电极表面,ATU也以S端和表面发生化学吸附, 但整个分子斜躺吸附在电极表面上。

Time-resolved surface-enhanced raman spectroscopic studies on coadsorption of derivatives of thiourea with ClO4^- at Ag electrodes

By means of Surface- enhanced Raman Spectroscopy (SERS), Timeresolved Surface-enhanced Raman Spectroscopy (TRSERS) and potential step method,the coadsorption behavior of methyl thiourea (MTU) and 1 -allyl- 2- thiourea (ATU) with ClO4- respectively at Ag electrodes has been studied. The SERS intensity- time profiles show that the intensities of different SERS bands have surprisingly different response rates to the potential step. The response rates of the groups of the adsorbed species which is close to the electrode surface are fast. The results also indicate that MTU is vertically adsorbed on Ag electrode surface via S atom, while ATU is adsorbed on the surface via S atom and the molecules leaned to the electrode surface.