Characterization of self-assembled thiols monolayers on gold surface by electrochemical impedance spectroscopy

Journal of the Brazilian Chemical Society

Renata K. Mendes²  Renato S. Freire¹  Carla P. Fonseca¹  Silmara Neves¹  Lauro T. Kubota² 

[1] ,Universidade Estadual de Campinas Instituto de Química Campinas SP ,Brazil

关键词: self-assembled monolayer;    cyclic voltammetry;    electrochemical impedance spectroscopy;    gold electrodes;    surface modification;   

DOI  :  10.1590/S0103-50532004000600011

来源: SciELO

【 摘 要 】

Thiols with different alkyl chain length and containing COOH terminal group were self-assembled on gold electrodes. The electron transfer of Fe(CN)6(3-/4-) couple to the electrode was studied at different pH by means cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Changes in solution pH resulted in the charge variation of the self-assembled monolayer (SAM) terminal group and, consequently, the electrostatic interaction of SAM with the electroactive species in the solution.

【 授权许可】

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