摘要
本文采用化学合成法在全氟羧酸阳离子交换膜中制备出了性能稳定，具有晶体结构的纳米尺寸的半导体ＣｄＳ超微粒．分析结果表明制得的ＣｄＳ超微粒在吸收和荧光光谱中均显示出显著的量子尺寸效应．随制备条件的不同，其吸收起始波长可从近５００ｎｍ蓝移至４００ｎｍ左右，荧光最大发射峰位也蓝移了１００ｎｍ（７００→６００ｎｍ）．单光子计数测得在膜中ＣｄＳ超微粒子的荧光寿命（约１μｓ）明显长于胶体溶液中的ＣｄＳ超微粒子寿命．
Abstract Nanometer sized CdS ultrasmall particles have been synthesized in perfluorocarboxylated cation-exchanged membrane by chemical reaction. CdS particles prepared by this method possess a crystalline structure and high stability. Notable quantum size effects have been shown in either its absorption or fluorescence spectrum.With different preparation conditions, wavelength can be blue shifted from 500 to 400urn for absorption onset and from 700 to 600nm for emission maximum wavelength. From the single photocounting data,the luminescence lifetime estimated by us is approximately ins, longer than that of colloidal CdS.
基金
国家高技术新材料领域专家委员会
中科院感光化学研究所光化学开放实验室
半导体超晶格国家重点实验室资助
