SURFACE OXIDATION AND WATER DESORPTION OF CDS

The surface oxidation and H2O desorption of powder CdS were studied by means of X-ray photoelectron spectroscopy (XPS), quadrupole mass spec trometry (QMS) and in-situ FTIR. The results show that with the change s of surface composition and the elongation of store time of CdS there are four types of H2O thermally desorbed at different temperatures. I t has also been found that through high-temperature air treatment for a short time the oxidized surface layer of CdS can prevent O-2 and H2O in air from further attacking the inner CdS molecules.