Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (06): 721-723.doi: 10.3866/PKU.WHXB19930601

• Communication •     Next Articles

Evidence for Different Responsing Rates of Different sers Bands of Surface Species on Change of Electrode Potentials

Tian Zhong-Qun; Li Wu-Hu; Gao Jin-Song; Mao Bing-Wei   

  1. State Key Laboaratory for Physical Chemistry of the Solid Surface, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:1993-07-26 Revised:1993-09-02 Published:1993-12-15
  • Contact: Tian Zhong-Qun

Abstract: In-situ time resolved Raman spectroscopy has been used to study the coadsorption of thiourea (TU) and ClO_4~- at Ag electrodes. The time resolved SERS intensities were monitored following electrode potential steps. As the electrode potential was stepped from -0.3 V to -0.9 V, the SERS intensities of TU were able to follow the potential change immediately. However, pro-longed time was needed for the intensities to follow the step from -0.9 V to -0.3 V. Significant difference of the rate of intensity change for different SERS bands of TU was observed even in such a potential step, which may be related to the changes in orientation of TU or its configuration with the coadsorbed ClO_4~-.

Key words: Surface enhanced Raman scattening, Times resolved, Thiourea, Coadsorption, Ag electrodes