The influence of surfactants on the electron-transfer reaction at self-assembled thiol monolayers modifying a gold electrode

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 484; no. 1; pp. 88 - 92
• Main Authors: Wang, Jun, Zeng, Baizhao, Fang, Cheng, Zhou, Xingyao
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 07.04.2000; Elsevier Science
• Subjects: Chemistry; Electrochemistry; Electron transfer; Exact sciences and technology; General and physical chemistry; Kinetics and mechanism of reactions; Self-assembled monolayer; Surfactant; Thiols; Electron transfer; Self-assembled monolayer; Thiols; Surfactant; Alkali metal Compounds; Monolayer; Cationic surfactant; Ionic interaction; Cyclic voltammetry; Transfer reaction; Electrode reaction; Reaction inhibition; Reaction mechanism; Electrochemical reaction; Glutathione; Modified material; Electrode adsorption; Gold; Electrolyte solution; Potassium Hexacyanoferrates III; Transition metal; Sodium compound; Experimental study; Quaternary ammonium compound; Anionic surfactant; Concentration effect; Aqueous solution; Micellar solution; Disk electrode
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/S0022-0728(00)00045-0

Monolayer films of thiols with different terminal groups (CH 3, COOH and NH 2) were prepared on gold electrodes using a self-assembling procedure. Cyclic voltammetry was used to investigate the electron-transfer reaction of potassium ferricyanide at the thiol modified gold electrode in the presence of surfactants. It was found that surfactants show some effects on the electron-transfer reaction at the thiol modified electrode. Cationic surfactants can improve the reversibility of a redox reaction at the thiol modified gold electrodes, while anionic surfactants cause a little inhibition of electron transfer of the redox at both methyl and carboxyl terminal thiol modified gold electrodes. Surfactants can interact with thiol monolayers in different ways, changing the structure and properties of the monolayer film, and can further affect electron transfer at the modified gold electrode.