硒化锌量子点的热解组装及光学性质研究

HOT SOAP ASSEMBLY AND OPTICAL PROPERTIES OF ZnSe QUANTUM DOTS

报道了在无水无氧环境下利用热解反应将硒化锌量子点组装入介孔二氧化硅有序孔道内的方法,采用X射线衍射、透射电子显微成像及能量散射谱等测试方法分析了体系的微观结构,并采用紫外-可见光吸收光谱仪和荧光光谱仪研究了其光学性质.结果表明硒化锌量子点被组装在介孔二氧化硅的孔道内;与硒化锌体材料本征吸收谱相比,组装在介孔内的量子点的吸收光谱表现出显著的蓝移,这归结于量子尺寸效应.

ZnSe quantum dots （QDs）, assembled into the ordered channels of mesoporous silica （SBA-15） under water- free and oxygen-free conditions by hot soap method, were investigated. The microstructures of the mesoporous silica with ZnSe QDs were characterized by X-ray diffraction, transmission electron microscopy image and energy dispersive spectrometry. Their optical properties were studied by UV-visible absorption and fluorescence spectrometry. The results show that the ZnSe QDs have been loaded into the ordered SBA-15 channels. Compared with the bulk ZnSe, the absorbance spectra of the ZnSe QDs immobilized in the channels exhibit a significant blue-shift, which is attributed to the quantum size effect.