The structure and chemical and acid-base state of the surface of solid solutions and binary components in the InSb-CdS system

Abstract

The surface physicochemical properties, including microstructure, chemical composition, and acid base surface properties, of solid solutions and binary components in the InSb-CdS system obtained for the first time were studied. Films of all the components had a polycrystalline structure with a nonuniform character of the distribution of crystallites, which associated into agglomerates. The chemistry of the surface was mainly determined by adsorbed H 2 O and CO 2 molecules, OH -groups, and, to a lesser extent, oxygen and hydrogen carbon compounds. The strength, concentration, and nature of acid centers were determined. Coordination unsaturated In and Cd atoms, adsorbed water molecules, and OH -groups were responsible for acid basic centers. Changes in the acid base properties of the surface of InSb-CdS system components caused by composition variations were studied. They correlated with the "specific conductivity-composi tion" dependence, reflected the special features of donor acceptor interactions in solid solutions, and could be used to predict adsorption catalytic properties.