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Citation: Tian Zhong-Qun, Li Wu-Hu, Gao Jin-Song, Mao Bing-Wei. Evidence for Different Responsing Rates of Different sers Bands of Surface Species on Change of Electrode Potentials[J]. Acta Physico-Chimica Sinica, ;1993, 9(06): 721-723. doi: 10.3866/PKU.WHXB19930601 shu

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

1.
State Key Laboaratory for Physical Chemistry of the Solid Surface, Department of Chemistry, Xiamen University, Xiamen 361005

Received Date: 26 July 1993
Available Online: 15 December 1993

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~-.
- Surface enhanced Raman scattening; Times resolved; Thiourea; Coadsorption; Ag electrodes
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