Gas Adsorption at the Components of the GaAs-CdS System

I. A. Kirovskaya

Omsk State Technical University, Omsk, Russia

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Received June 13, 2007

Abstract — Adsorption properties of the GaAs–CdS-system solid solutions and binary compounds are studied with respect to CO and NH₃ by the piezoelectric quartz microweighing, programmed thermal desorption, and IR-spectroscopy. Based on the experimental dependences (_p = f(T), _T = f(P), _T = f(t)), thermodynamic and kinetic characteristics of adsorption, analysis of the surface chemical composition, the adsorbents’ acid-base and other physicochemical characteristics. With due allowance for electron structure of the adsorbate’s molecules, the mechanism and specifity of adsorption processes are determined as functions of the operation conditions and system composition. By comparing the adsorption properties of the binary compounds (GaAs and CdS) with those of the solid solutions (GaAs)_x(CdS)_{1 x}, their similarities, as well as the specificity of the solid solutions as multicomponent systems, were revealed. Optimal adsorbent compositions to be used in primary transducers in the medicine- and environment-orientated sensors are found.

PACS numbers: 68.43.-h