胶体水相法制备高量子产率及高稳定性的水溶性ZnSe量子点

A Facile Colloid Aqueous Method for Synthesis of Water Soluble ZnSe Quantum Dots with High Fluorescence and Stability Characterization

采用简便的胶体水相法制备了高荧光强度且稳定性良好的ZnSe量子点（ZnSe QDs）,克服了以往水相合成法稳定性差、量子产率低等缺陷。优化后的最佳合成条件为：以还原型L-谷胱甘肽作为稳定剂,L-谷胱甘肽∶Se2-∶Zn2＋摩尔比为5∶1∶5,介质pH 10.5,反应温度在90~100℃之间。且合成后不需要采取任何光照后处理,ZnSe QDs的量子产率（QYs）即可高达50.1%,放置3个月后荧光强度基本不变,水溶性优良。用紫外-可见分光光度法（UV-Vis）、荧光分光光度法（FL）、透射电子显微镜（TEM）等分析检测手段,对得到的ZnSe QDs的性能进行表征。合成的量子点在300 nm激发下发蓝紫色荧光（370 nm）,其优良的光化学特性将有利于其在光热器件的制造及化学生物领域的应用。

Highly fluorescent and stable ZnSe quantum dots were synthesized by a facile colloid aqueous phase route. It overcame the defects such as instability and low quantum yields of the quantum dots synthesized by early aqueous phase route. Optimum conditions were found. L-glutathione was used as the stabilizer, the molar ratio of L-glutathione, Se^2- and Zn^2＋ is 5 ： 1 ： 5, the reaction media is pH 10.5, and the proper temperature is between 90 and 100 ℃. Quantum yields （QYs） could reach to 50. 1% without post irradiation in prime synthetical conditions. And the fluorescence intensity of ZnSe QDs almost didn＇t change after 3 months. Its water-soluble property is also excellent. The properties of ZnSe QDs were characterized by means of ultraviolet visible spectra, fluorescence spectra, and transmission electron microscopy. The synthesized Zn.Se QDs emit blue-purple fluorescence （370 nm） when excited at 300 nm. And the excellent photochemical characteristics of the ZnSe QDs will be advantageous in the application in optothermal device manufacture and chemistry biology domain.