表面修饰的ZnS：Mn量子点的发光性质及其对生物分子的检测  

Luminescent Properties of Surface Modified ZnS:Mn Quantum Dot and Detection of Biological Molecules

作　　者：杜鸿延[1] 魏志鹏[1,2] 李霜[1] 楚学影[1] 方铉[1,2] 方芳[1] 李金华[1] 陈新影[1] 王晓华[1] 

机构地区：[1]长春理工大学理学院.吉林长春130022 [2]长春理工大学高功率半导体激光国家重点实验室,吉林长春130022

出　　处：《发光学报》2013年第4期421-426,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61006065,61076039,61204065,61205193);高功率半导体激光国家重点实验室基金(9140C310101120C031115);高等学校博士学科点专项科研基金(21022216110002,20102216110001,20112216120005);吉林省自然科学基金(20101546);吉林省科技发展计划(20090139,20090555,20121816,201201116);吉林省教育厅项目(2011JYT05,2011JYT10,2011JYT11);长春市国际科技合作计划(2010CC02)资助项目

摘　　要：采用水热法制备了ZnS:Mn量子点,探讨了掺杂离子浓度对ZnS:Mn量子点的晶体结构和发光性质的影响。通过荧光光谱对样品进行表征。结果表明:掺杂离子的摩尔分数达到2%时,ZnS:Mn量子点在595 nm附近的发光最强;继续增加掺杂浓度反而出现荧光猝灭的现象。本文还研究了表面修饰对量子点形貌和发光性质的影响。通过透射电子显微镜(TEM)观察样品的形貌,发现经过3-巯基丙酸(MPA)修饰后的样品表面团聚现象得到改善,并且尺寸单一、单分散性较好,平均粒径约为5 nm。经过修饰后的样品减少了表面非辐射性缺陷中心,使掺杂Mn2+所引起的595 nm附近的发射峰强度增大。将MPA修饰后的ZnS:Mn量子点与牛血清白蛋白(BSA)分子进行生物偶联,并利用BCA法对偶联上的蛋白含量进行定量检测,结果显示经过修饰后的量子点偶联蛋白的能力更强。ZnS： Mn quantum dots were prepared by hydrothermal method. The effect of the doping concentration of ZnS： Mn quantum dots on crystal structure and luminescent properties was dis- cussed. The quantum dots were characterized by the fluorescence spectroscopy. The results indica- ted that ZnS： Mn quantum dots exhibited the strongest emission at 595 nm, with 2% doping mole fraction, then with doping concentration increasing, the intensity of luminescent decreased due to the fluorescence quenching phenomenon. The effect of surface modification on the morphologies and luminescent properties of quantum dots were also discussed. Transmission electron microscope（TEM） images indicated that the surface aggregation phenomenon of ZnS： Mn quantum dots was im- proved with the MPA surface modification, the quantum dots also exhibited single size and good dis- persibility properties, the average particle diameter was about 5 nm. In addition, the surface non-ra- diation defect centers were reduced, which caused emission peak intensity increasing at 595 nm by Mn2＋ doping. The surface modified ZnS： Mn quantum dots were conjugated with bovine serum albu- min （BSA） molecules. In BCA detection, the results indicated that the surface modified ZnS： Mn quantum dots had the better biological conjugation property.

关 键 词：ZNS MN 表面修饰 发光 BCA法检测 

分 类 号：O614[理学—无机化学]