Modification of Indium–Tin Oxide (ITO) Glass with Aziridine Provides a Surface of High Amine Density

Author(s): Kim, Chang Ok, Sun-Young Hong, Minju Kim, Su-Moon Park, Joon Won Park

Journal: J. Colloid Interface Sci. (2004) 277: 499-504.

Abstract:
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)₆^4-. Electrochemical impedance spectroscopic experiments unveiled that the modified electrode was more efficient for electron transfer to the latter species than to the former.