Xue Mei, Wang Xu, Zhang Xiaohua, Zhuo Linhai, Tang Bo
College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Engineering Research Center of Pesticide and Medicine Intermediate Clean Production, Ministry of Education, Shandong Normal University, Jinan 250014, People's Republic of China.
J Nanosci Nanotechnol. 2011 Apr;11(4):3191-9. doi: 10.1166/jnn.2011.3602.
Water soluble, thioglycolic acid (TGA) modified CdSe nanocrystals (NCs) have been prepared in aqueous media by the reaction between Cd2+ and NaHSe. Although initially these quantum dots (QDs) display photoluminescence (PL) with very low quantum yields (QY), upon prolonged exposure to ambient light, a strong PL enhancement by illumination is observed which leads to water soluble QDs with high luminescence. This result may have important application potential in biological or other fields. The primary reason for the luminescence enhancement is concluded to be the incorporation of sulfide ions from TGA into the lattice of CdSe NCs and the subsequent formation of alloy structures. Moreover, the CdSe/CdS core-shell structured QDs synthesized in aqueous solutions also consolidate this conclusion.
通过Cd²⁺与NaHSe在水介质中的反应，制备了水溶性硫代乙醇酸（TGA）修饰的CdSe纳米晶体（NCs）。尽管最初这些量子点（QDs）显示出量子产率（QY）非常低的光致发光（PL），但在长时间暴露于环境光后，观察到光照导致强烈的PL增强，从而产生具有高发光性的水溶性量子点。这一结果在生物或其他领域可能具有重要的应用潜力。发光增强的主要原因被认为是TGA中的硫离子掺入到CdSe NCs的晶格中并随后形成合金结构。此外，在水溶液中合成的CdSe/CdS核壳结构量子点也证实了这一结论。
