影像科学与光化学 ›› 1996, Vol. 14 ›› Issue (3): 230-236.DOI: 10.7517/j.issn.1674-0475.1996.03.230

• 研究论文 • 上一篇    下一篇

胶体半导体表面光还原反应动力学的ESR研究──I.ZnS、CdS光还原效率的ESR研究

李磊明, 张志义, 王大辉, 万谦   

  1. 中国科学院生物物理研究所, 北京100101
  • 收稿日期:1995-12-18 修回日期:1996-04-01 出版日期:1996-08-20 发布日期:1996-08-20
  • 通讯作者: 张志义

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   

  1. 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

摘要: 用电子自旋共振(ESR)法以4-氧-2,2,6,6-四甲基-哌啶酮(4-oxo-TEMPO)作为电子受体,研究了ZnS和CdS胶体表面光还原效率的差异,发现在本实验体系中胶体表面光还原对于底物是零级反应,其原因可能是由于胶体的吸附作用使得4-oxo-TEMPO在胶体表面处于饱和状态。测得的反应动力学常数能够定量地表示胶体半导体光还原效率的差异。实验结果表明,由于吸收光谱范围的限制,ZnS胶体在不同波长光照下以及ZnS和CdS胶体在同样光照下的光还原效率均不相同。

关键词: 光还原, 4-氧-2,2,6,6-四甲基-哌啶酮, 硫化镉, 硫化锌, 电子自旋共振

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