纳米CdS-磺化聚苯胺（SPAn）多层复合膜的光学特性研究

研究了利用层-层自组织生长法制备的磺化聚苯胺-CdS纳米晶体复合膜的光学特性.研究发现，随样品中CdS 纳米晶体尺寸的减小，量子尺寸效应明显增强；在紫外吸收谱中表现为吸收边出现了明显蓝移；在光致发光谱中，不仅激子直接复合产生的带边发射产生了蓝移，而且陷阱态复合产生的宽带发射也发生了蓝移.还发现样品经低温退火处理后，激子复合产生的带边发射显著增强，发射带宽随纳米尺寸的减小而变窄.这说明退火后CdS 纳米晶粒的有序性和均匀度显著增加. 关键词： CdS 纳米晶体 SPAn 吸收 发光

Study on the optical properties of the nanometer CdS-sulfonic group polyaniline (SPAn) composite multiplayer films

The nanometer CdS sulfonic group polyaniline (SPAn) polymer multiplayer films were grown in self assembled layer by layer is reported and the optical properties are investigated. The optical measurement results show that the quantum size effect becomes strong with the decrease of the size of CdS nanocrystals. Blue shift appears on the absorb edgea in the absorption spectrum and also on the exciton band edge emission peaks in the luminescence spectrum. The observed results of the corresponding annealed samples show that the intensity of the band edge emission from the exciton direct recombination canbe enhanced about two to three times, and the band width becomes narrower than that of the un annealed sample, indicating that CdS nanocrystals become more ordering, and their sizes become more uniform in the annealed sample.