SOL-GEL法制备的CdS纳米晶粒的量子尺寸效应

QUANTUM SIZE EFFECTS IN CdS NANOCRYSTALSPREPARED BY SOLGEL METHOD

采用溶胶—凝胶（ＳＯＬ－ＧＥＬ）法制备Ⅱ－Ⅵ族化合物ＣｄＳ颗粒胶体溶液，研究其晶体结构及量子尺寸效应，结果表明ＣｄＳ颗粒的晶体结构为纤锌矿结构，颗粒尺寸可以通过改变反应物的浓度加以控制，当颗粒尺寸为５ｎｍ左右时。

Over the past ten years extensive research has been carried out in the field of nanometersized semiconductor particles. Due to the confinement of charged carries to the small particles, quantum size effects are observable. These new materials differ from the bulk materials in the optical and electrical properties and have resulted in many new optoelectrical devices. Current directions in this field of research include the different new preparation techniques of nanometersized semiconductor particles (i.e.colloidal solutions, inverse micellar method, and sputtering in Vycor glasses etc), the syntheses and the characterization of semiconductor particles, and the modifications of quantum particles by means of surface chemistry. In this paper, SolGel method is used to synthesize the CdS particles of ⅡⅥ compounds. The results of the research show that CdS nanoparticles have a wurtzite crystal structure. The size of CdS nanoparticles can be controlled by changing the concentrations of the reactants in the solution. For the nearly 5nm CdS particles, we have successfully observed the blue shift phenomena in absorption edge.