微波合成水溶性CdHgTe/CdS量子点及其荧光稳定性研究  

Microwave-Assisted Synthesis of Water-dispersed CdHgTe/CdS Quantum Dots and the Study of Fluorescence Stability

作　　者：刘西京 吕继良 刘红雨[2] 赵亚楠 LIU Xijing;LYU Jiliang;LIU Hongyu;ZHAO Yanan(School of Environmental Science and Engineering,Hubei Polytechnic University,Huangshi Hubei 435003;School of Resource and Environmental Science,Wuhan University,Wuhan Hubei 430079)

机构地区：[1]湖北理工学院环境科学与工程学院,湖北黄石435003 [2]武汉大学资源与环境科学学院,湖北武汉430079

出　　处：《湖北理工学院学报》2019年第2期12-16,30,共6页Journal of Hubei Polytechnic University

基　　金：国家自然科学基金项目(项目编号:20777058; 81471789);湖北省自然科学基金项目(项目编号:2014CFB183);湖北理工学院引进人才项目(项目编号:18xjz03R)

摘　　要：不同于已有的采用CdTe作为模板合成CdHgTe量子点,首次采用微波辅助加热法一步合成CdHgTe/CdS核壳量子点,提出了一种简单、快速、高效的水相微波合成核壳量子点的方法。采用透射电镜、X射线衍射对CdHgTe/CdS核壳量子点的结构进行了表征,发现巯基丙酸降解释放的硫与溶液中的镉离子形成了一层厚厚的CdS结构,钝化于CdHgTe的表面,极大地提高了量子点的荧光稳定性和荧光产率。在此基础上,探讨了所合成的核壳量子点在氧化剂过氧化氢及350 W氙灯作用下的荧光稳定性,发现这种具有明亮红色荧光的量子点具有极高的稳定性,可作为探针高效应用于污水检测及生物成像领域。A simple,rapid and highly efficient method has been developed for aqueous core-shell quantum dots(QDs)by microwave irradiation.Unlike other experiments,CdHgTe were synthesized using CdTe as a template,high quality CdHgTe/CdS QDs were prepared via the one-step method for the first time.Then CdHgTe/CdS QDs were characterized by transmission electron microscopy and powder X-ray diffraction,respectively.The results showed that the sulfide ions released from MPA during illumination coordinated with cadmium ions to form the structure of CdS,which passivated the surface of CdHgTe.This structure improved the photostability and photoluminescence quantum yields(PLQYs).On the basis,the spectral stabilities of the obtained core-shell CdHgTe/CdS QDs under environmental exposure such as oxidation and Xenon lamp irradiation were also discussed.The results illustrated that the bright red fluorescence QDs can be an alternative probe in wastewater monitoring and the imaging of living animals.

关 键 词：微波辅助 水溶性量子点 荧光稳定性 污水检测 

分 类 号：X52[环境科学与工程—环境工程]