The surface of indium–tin oxide (ITO) substrates was successfully modified with aziridine. Modification of the surface was achieved through facile ring-opening, and hyperbranching polymerization of the ring-strained heterocycle initiated from the reactive group on the surface. Amine density of the aziridine-modified ITO measured with UV–vis spectrophotometry is 10 amines/nm2. Cyclic voltammetric analysis showed that the aziridine-modified electrode was less active for Ru(NH3)63+ in comparison with the pristine electrode, while no difference was observed for Fe(CN)64-. Electrochemical impedance spectroscopic experiments unveiled that the modified electrode was more efficient for electron transfer to the latter species than to the former.
Kim, Chang Ok, Sun-Young Hong, Minju Kim, Su-Moon Park, Joon Won Park
J. Colloid Interface Sci.