摘要
胶体半导体量子点是一类尺寸介于单个分子与体相材料之间的纳米晶,在基础研究和技术应用领域都受到人们极大的关注。其中CdSe量子点由于强的电子与空穴限域效应,使其具有粒径、形状与其光电性质间的强关联作用。这些优异的性质使其成为一种良好的可调谐光学发射体．可应用于生物标记领域。与传统的荧光探针分子相比，CdSe等IIBVIA族半导体荧光量子点具有激发光谱宽，发射光谱窄．颜色可调，即不同大小的纳米晶量子点能被单一波长的光激发而发出不同颜色的荧光．发光强度高．荧光寿命长，光稳定性好等优点，
Water-soluble fluorescent CdSe quantum dots（QDs） were synthesized by using Se、Na2SO3 and CdCl2 as precursors and mercaptoacetic acid（TGA） as modifier.The effects of refluxing time and initial pH values of the reaction on the particle size and fluorescence intensity of CdSe QDs were studied.The XRD、HRTEM and fluorescent spectroscopy were employed to characterize these samples.It is found that CdSe QDs with crystalline size of 2～3 nm are homogeneously distributed in the organic matrix.The maximum fluorescence absorption and emission peak of CdSe QDs solution are at 450 nm and 562 nm,respectively.The fingerprint details on the surface of smooth objects were clearly developed with CdSe QDs solution under irradiation of UV lights.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2008年第7期1186-1190,共5页
Chinese Journal of Inorganic Chemistry
基金
“十一五”国家科技支撑计划(No.2007BAK26B08)资助项目
关键词
CDSE量子点
水相合成
荧光
指纹显现
CdSe QDs,aqueous synthesis,fluorescence,fingerprint development
