液-液界面制备近红外荧光Ag_2S量子点  

Liquid-Liquid Interfacial Synthesis of Ag_2S Quantum Dots with Near-infrared Fluorescence

作　　者：潘良军 麻浩天 田智全[1] 张志凌[1] 

机构地区：[1]生物医学分析化学教育部重点实验室武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《分析科学学报》2017年第2期149-153,共5页Journal of Analytical Science

基　　金：国家自然科学基金(No.21375100)

摘　　要：利用液-液界面反应体系,使分别溶解在油相中的银前体和水相中的硫前体在液滴界面发生反应,在室温条件下成功制备出近红外荧光Ag_2S量子点。采用透射电子显微镜(TEM)、X-射线衍射光谱(XRD)、傅立叶变换红外(FT-IR)光谱和荧光光谱等对产物进行了表征。结果表明,此方法成功制得了粒径较均一的Ag_2S量子点,纯化后经加热熟化处理其量子产率可达2.68%。另外实验发现,通过改变投料比即可实现Ag_2S量子点的粒径控制及荧光发射峰波长调控(1 170nm至1 279nm)。At room temperature,liquid-liquid interfacial system was employed to prepare Ag2S quantum dots（QDs）with emissions in the near-infrared region.In this system,silver precursor dissolved in the oil phase can react with sulfur precursor dissolved in the water phase at the liquid-liquid interface.The products were characterized by transmission electron microscopy（TEM）,X-ray powder diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,and fluorescence spectroscopy.The results indicated that as-prepared Ag2S QDs have a relatively narrow size distribution.With the treatment of post-synthesis ripening,the quantum yield（QY）is 2.68%.In addition,Ag2S QDs with different sizes and corresponding emission-tunable spectra（1 170-1 279nm）can be prepared by changing the precursor Ag∶S feed molar ratio.

关 键 词：界面反应 液滴 近红外 AG2S 量子点 

分 类 号：O657[理学—分析化学]