The effect of an alkylsilane monolayer on an indiumtin oxide surface on the electrochemistry of hexacyanoferrate

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 484; no. 2; pp. 194 - 202
• Main Authors: Markovich, Inna, Mandler, Daniel
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 17-04-2000; Elsevier Science
• Subjects: Chemistry; Cyclic voltammetry; Electrochemistry; Electron transfer; Exact sciences and technology; General and physical chemistry; Hexacyanoferrate; Indiumtin oxide; Kinetics and mechanism of reactions; Redox potential; Self-assembled monolayer; Cyclic voltammetry; Hexacyanoferrate; Electron transfer; Self-assembled monolayer; Redox potential; Indiumtin oxide; Monolayer; Oxidation reduction; Hexacyanoferrates; Silicon Organic compounds; Plate electrode; Organic silane; Hydrophobicity; Experimental study; Indium oxide; Electrochemical properties; Metal Compounds; Inorganic anion; Electrode reaction; Tin oxide; Reaction mechanism; Kinetic parameter; Aqueous solution; Rate constant; Electrochemical reaction; Modified material
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/S0022-0728(00)00084-X

The presence of a disorganized octadecylsilane, C
18, monolayer on an indiumtin oxide (ITO) electrode has a profound effect on the electrochemistry of hexacyanoferrate, Fe(CN)
6
3−/4−. We found that the alkylsilane monolayer forms a hydrophobic matrix, which affects the heterogeneous rate of electron transfer of the metallic complex, depending on the nature of the counter cation presence in the solution. A model is suggested which accounts for these effects as well as for the changes in the formal redox potential that are observed.