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

[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)63-/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.

[学科分类] 化学（综合）

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