Tetrasulfonated copper and cobalt phthalocyanines have been bound to SnO2 electrode surfaces modified by either (γ-aminopropyl)triethoxysilane or 3-(N-(2-aminoethyl)aminopropyl)trimethoxysilanes. The electrochemical behavior of the surface bound dye was compared with that of the solution and absorbed forms at SnO2 in Me2SO and aqueous media. A stable reversible redox couple was seen on the cobalt phthalocyanine electrodes/SnO2 in aqueous media. Concentrations of surface bound phthalocyanines were easily detected by monitoring the Cu(2p1/2,3/2) and N(1s) X-ray photoelectron transitions. SnO2 electrodes with bound phthalocyanine and SnO2 electrodes in contact with solutions of phthalocyanines showed similar photoelectrochemical response to the oxidation of oxalate or ascorbate.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry