PHOTOREACTIONS OCCURRED ON THE SURFACE OF ZnO ULTRAFINE PARTICLE UNDER UV IRRADIATION

doi:10.7517/j.issn.1674-0475.1996.01.59

Abstract

Abstract: ZnO ultrafine particles were prepared in the presence of polyvinylpyrrolidone(PVP)and the photoreactions occurred on the surface of such particles under UV irradiation were studied through UV/Vis and fluorescence spectroscopy.In the presence of oxygen,it was found that new ZnO collloids were generated under UV irradiation when excess Zn²⁺ ions were adsorbed on ZnO surface whereas only dissolution of ZnO was observed when OH^- was in excess,The results of fluorescence quenching experiments suggest that Zn²⁺ on the surface of ZnO acts as the visible fluorescence center of ZnO particles.

Key words: ultrafine particle, ZnO, fluorescence center, photoreaction

CHEN Sihai, REN Xinmin, U. Nickel. PHOTOREACTIONS OCCURRED ON THE SURFACE OF ZnO ULTRAFINE PARTICLE UNDER UV IRRADIATION[J]. Imaging Science and Photochemistry, 1996, 14(1): 59-64.

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PHOTOREACTIONS OCCURRED ON THE SURFACE OF ZnO ULTRAFINE PARTICLE UNDER UV IRRADIATION

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