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Journal of Electrochemistry ›› 2016, Vol. 22 ›› Issue (1): 32-36.doi: 10.13208/j.electrochem.150819

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Adsorption Behavior of Rhodamine 6G on Silver Surfaces Studied by Electrochemical Surface-Enhanced Raman Spectroscopy

CHEN Chan-juan1, ZONG Cheng1, LIU Guo-kun2, REN Bin 1*   

  1. 1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. State Key Laboratory of Marine Environmental Science, College of the Enviroment and Ecology, Xiamen University, Xiamen 361002, Fujian, China
  • Received:2015-08-19 Revised:2015-09-28 Online:2016-02-29 Published:2015-11-09
  • Contact: REN Bin E-mail:bren@xmu.edu.cn
  • About author:REN Bin

Abstract:

Rhodamine 6G (R6G) is one of the most common probe molecules employed in single molecule surface-enhanced Raman spectroscopy (SM-SERS). The study in adsorption behavior of R6G will help understand the interactions between R6G and surface. In this paper, we used electrochemical surface-enhanced Raman spectroscopy (SERS) to study the potential-dependent adsorption behavior of R6G on silver electrodes. Our results show that when the potential moved negatively, the orientation of R6G on silver surface changed from vertical to inclined adsorption. This result indicates that the abnormal SM-SERS spectra of R6G observed in the former SM-SERS studies from other research groups are due to the reorientation of the R6G molecule on the surface rather than the change in resonance effect of R6G. Such a detailed study will assist the understanding for the spectral change of SERS in SM-SERS studies.

Key words: rhodamine 6G, adsorption behavior, electrochemistry, electrochemical surface-enhanced Raman spectroscopy

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