Citation: LIU Wen-Han, YUAN Rong-Hui, TENG Yuan-Jie, MA Chun-An. Electrochemical SERS of Self-Assembled Monolayer of Thiosalicylic Acid Adsorbed on Activated ld Electrodes[J]. Acta Physico-Chimica Sinica, ;2013, 29(12): 2599-2607. doi: 10.3866/PKU.WHXB201310231 shu

Electrochemical SERS of Self-Assembled Monolayer of Thiosalicylic Acid Adsorbed on Activated ld Electrodes

1.
State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 29 July 2013
Available Online: 23 October 2013
Fund Project: 国家自然科学基金(10804099) (10804099) 浙江省科技厅公益项目(2012C37014) (2012C37014)浙江省重点科技创新团队(2011R09002-12)资助 (2011R09002-12)

Amonolayer film of thiosalicylic acid (TSA) adsorbed on activated ld electrodes was investigated by using in situ electrochemical surface-enhanced Raman scattering (EC-SERS). In the SERS spectra of selfassembled monolayers in solutions with different pH values, two peaks with Raman intensities that decreased with increasing pH were observed. The optimum EC-SERS signals were obtained at 0.7 V and 70 s, and it was found that the intensities became weaker, and the peaks eventually disappeared, when the potential was negatively shifted. This showed that the alignments of TSA assembled on the ld surface changed in response to changes in the external conditions. The absorption mechanism of the TSA monolayer was investigated by calculating the distribution fraction of TSA at different pH values and the enhancement factor (EF) at different potentials, using a combination of SERS and EC-SERS. As a result of different electrochemical absorption orientations of TSA and its reduction/desorption behavior at high negative potentials, the Raman enhanced effect of TSA on ld was significantly reduced and the SERS activity was irreversibly lost.
- Electrochemical surface-enhanced Raman scattering,
- Thiosalicylic acid,
- Self-assembled monolayer,
- ld electrode,
- Enhancement factor
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