ESR STUDY OF PHOTOREDUCTION KINETICS ON THE SURFACE OF COLLOIDAL SEMICONDUCTOR──Ⅰ.ESR STUDY OF PHOTOREDUCTION EFFICIENCY OF ZnS AND CdS

doi:10.7517/j.issn.1674-0475.1996.03.230

Imaging Science and Photochemistry ›› 1996, Vol. 14 ›› Issue (3): 230-236.DOI: 10.7517/j.issn.1674-0475.1996.03.230

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ESR STUDY OF PHOTOREDUCTION KINETICS ON THE SURFACE OF COLLOIDAL SEMICONDUCTOR──Ⅰ.ESR STUDY OF PHOTOREDUCTION EFFICIENCY OF ZnS AND CdS

LI Leiming, ZHANG Zhiyi, WANG Dahui, WAN Qian

Instirute of Biophysics, The Chinese Academy of Sciences, Beijing, 100101, P.R. China

Received:1995-12-18 Revised:1996-04-01 Online:1996-08-20 Published:1996-08-20

Abstract

Abstract: Using 4-oxo-TEMPO as electron acceptor, the difference of photoreduction efficiency of ZnS and CdS was investigated by ESR method. The photoreduction reaction on the colloid surface was zero-order for reduction substrate.The reason may be the adsorption effect of colloid,which causes 4-oxo-TEMPO saturated on the surface of colloid.Kinetics constants measured can quantitatively express the photoreduction efficiency difference of colloidal semiconductors.Because of the restriction of absorption spectra, the photoreduction efficiency of ZnS under difference wavelength irradiation and ZnS, CdS under the same irradiation all are different.

Key words: photoreduction, 4-oxo-2,2,6,6-tetramethyl-1-piperdnyloxy cadmum sulfide, zinc sulfide, electron spin resonance

LI Leiming, ZHANG Zhiyi, WANG Dahui, WAN Qian. ESR STUDY OF PHOTOREDUCTION KINETICS ON THE SURFACE OF COLLOIDAL SEMICONDUCTOR──Ⅰ.ESR STUDY OF PHOTOREDUCTION EFFICIENCY OF ZnS AND CdS[J]. Imaging Science and Photochemistry, 1996, 14(3): 230-236.

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ESR STUDY OF PHOTOREDUCTION KINETICS ON THE SURFACE OF COLLOIDAL SEMICONDUCTOR──Ⅰ.ESR STUDY OF PHOTOREDUCTION EFFICIENCY OF ZnS AND CdS

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