ZnSe量子点的水相合成及光诱导荧光增敏效应  

The preparation of ZnSe Qdots in aqueous solution and the effects of photo-induced fluorescence enhancement

作　　者：黄朝表[1] 吴川六[2] 张丹宁[1] 郑晋生[2] 赖金平[2] 李舒艳[2] 赵一兵[2] 

机构地区：[1]浙江师范大学化学与生命科学学院,浙江金华321004 [2]厦门大学化学系现代分析科学教育部重点实验室,福建厦门361005

出　　处：《浙江师范大学学报（自然科学版）》2009年第1期91-96,共6页Journal of Zhejiang Normal University:Natural Sciences

基　　金：浙江省自然科学基金资助项目(Y4080518)

摘　　要：在水相中,以巯基乙酸(TGA)为稳定剂制备了具有短波长荧光的ZnSe量子点.研究了ZnSe量子点光诱导荧光增敏的机理,并提出通过补加Zn2+和TGA以提高光诱导荧光增敏效率以及所得ZnSe量子点的稳定性这一新思路.研究结果表明,提高补加的Zn2+和TGA的量即可增加ZnSe量子点表面ZnS壳层的厚度,更好地钝化其表面,从而不仅可显著提高ZnSe量子点的荧光量子产率(最高可接近15%),而且可大大地提高其表面的抗氧化性和荧光稳定性.ZnSe Qdots with short wavelength-fluorescence were prepared in aqueous solution with thioglycolic acid （ TGA ） as capping reagent. The mechanism of photo-induced fluorescence enhancement was studied and it was proposed a novel approach involved in the addition of compensatory Zn^2＋ ions and TGA to the original ZnSe solution to increase the efficiency of photo-induced fluorescence enhancement and stability of ZnSe Qdots. The research indicated that the thickness of ZnS shell increases with the increase of the quantity of Zn^2＋ ions and TGA. The ZnS shell made a better passivation of the ZnSe Qdot surface, thus resulted in not only higher fluorescence quantum yield （maximal 15% ） , but also higher stability of ZnSe Qdots. It was ex- pected that the proposed approach would also provide a novel route to increase the fluorescence quantum yield and stability of other types of Qdot prepared in aqueous solution.

关 键 词：ZNSE 量子点 荧光增敏 光诱导 

分 类 号：O657.3[理学—分析化学]