The effect of an alkylsilane monoalyer on an indium-tinoxide surface on the electrochemistry of hexacyanoferrate

摘要

The presence of a disorganized octadecylsilane, C_(18), monolayer onanindium-tin oxide (ITO) electrode has a profound effect onthe electrochemistry of hexacyanoferrate, Fe(CN)_6~(3-/4-). We found that the alkylsilane monolayer forms a hydrophobic matrix, which affects the heterogeneous rate of electrontransfer of the metallic complex, depending onthe 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.