水溶性InP/ZnS量子点的合成及其在指纹显现中的应用  

Synthesis of water-soluble InP/ZnS quantum dots and its application in developing fingerprint

作　　者：熊海[1] 王珂[2] 于迎春[1] 刘建军[1] 左胜利[1] 杨瑞琴[2] 

机构地区：[1]北京化工大学理学院,北京100029 [2]中国人民公安大学刑事科学技术系,北京100038

出　　处：《化学研究》2011年第3期11-16,共6页Chemical Research

基　　金："十一五"国家科技支撑计划(2007BAK26B08)资助项目

摘　　要：以磷化锌、氯化铟为原料,以十二烷胺为溶剂,在150-200℃下合成了InP量子点,通过相转移和紫外光照得到了巯基乙酸修饰的水溶性InP/ZnS量子点.利用X射线衍射仪、透射电镜、高分辨透射电镜、荧光光谱仪等分析了不同温度下合成的量子点的粒径、形貌、荧光性能及指纹显现效果.结果表明,合成的InP和InP/ZnS量子点为球形颗粒,粒径在3-5 nm之间,在水溶液中的分散性较好.不同温度下合成的InP复合ZnS后,得到的InP/ZnS量子点的荧光发射波长由438 nm红移至575 nm;利用该量子点在紫外光照下可以显示出较清晰的多色荧光指纹图像,可用于具有不同客体背景颜色指纹的鉴别.InP quantum dots（QDs） were synthesized at 150-180 ℃ using Zn3P2 and InCl3 as raw materials and dodecylamine as a solvent.Resultant InP quantum dots were then prepared into highly luminescent water-soluble InP/ZnS QDs modified by mercaptoacetic acid via phase transfer and ultraviolet-irradiation processing.The particle size,morphology,fluorescent property,and fingerprint developing effect of the InP/ZnS QDs synthesized at different temperatures were investigated by means of X-ray diffraction,transmission electron microscopy,high-resolution transmission electron microscopy,and fluorescence spectrometry.Results indicate that as-synthesized InP and InP/ZnS QDs are spherical particles with a particle size of about 3-5 nm and can be well dispersed in aqueous solution.Besides,the fluorescence emission wavelength of the InP/ZnS QDs synthesized at different temperatures was red-shifted to 575 nm from 438 nm,that of InP QDs.This means under ultraviolet irradiation the InP/ZnS QDs are able to clearly develop the fingerprint details on the surface of smooth objects in multicolored images,showing promising application for identification of fingerprints with different background colors.

关 键 词：InP/ZnS量子点 合成 荧光性能 指纹显现 应用 

分 类 号：O471.1[理学—半导体物理]