荧光性纳米金CdTe自组装膜制备及其对汞离子识别  

Preparation of fluorescent gold nanoparticle CdTe self-assembled monolayers and recognition for mercury (Ⅱ)

作　　者：胡文英[1,2] 傅丽君[1,2] 黄建辉[1,2] 陈春生[1] 

机构地区：[1]莆田学院环境与生物工程学院,福建莆田351100 [2]福建省新型污染物生态毒理效应与控制重点实验室,福建莆田351100

出　　处：《化工进展》2017年第2期641-646,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(31400318);莆田市科技项目[2014S03(1)];福建省自然科学基金(2017J0106)项目

摘　　要：采用水相合成法,以巯基乙酸作为稳定剂,直接在水相中合成碲化鎘(CdTe)量子点,以壳聚糖为中介,借助化学键吸附作用,间接将CdTe量子点组装在纳米金自组装膜表面上,对该膜最佳组装条件及其荧光性能探讨,并将膜用于汞离子检测。实验结果表明,纳米金CdTe自组装膜的荧光强度随着加入汞离子浓度的增大而发生猝灭,汞离子在0~16×10^(–8)g/L浓度范围内,CdTe自组装膜与其呈现良好线性关系,相关系数为0.9991,检出限为1.56×10^(–10)g/L,该膜具有稳定性好、灵敏度高、可再生等优点。并应用此方法对水样中痕量汞检测,发现3个样品中汞离子含量均未超标,样品加标回收率是96.5%~98%,该方法适用于痕量汞的分析测定。With mercaptoacetic acid as stabilizer,CdTe quantum dot was directly synthesized by water phase synthesis method. Then with chitosan as mediation,CdTe quantum dot was indirectly assembled onto gold nanoparticle self-assembled monolayer surface via the chemical bond adsorption. The preparation conditions and the fluorescence properties of CdTe quantum dot self-assembled monolayers（SAMs）were further studied. The experimental results showed that fluorescence intensity of the gold nanoparticle CdTe self-assembled film was quenched with the increase of mercury ion concentration,and it had a good linear relationship with mercury（Ⅱ） concentration in the range of 0—16×10^–8g/L with a correlation coefficient of 0.9991 and detection limit of 1.56×10^–10g/L. The membrane also showed good stability,high sensitivity and good renewability,etc. The new fluorescent sensor was used to detect mercury（Ⅱ） in water from three different areas in Pu tian,and it was found that the mercury ion concentrations of three samples were within the standard,and the sample recovery rate was 96.5%—98%,which verify the method was suitable for the determination of mercury（Ⅱ）.

关 键 词：自组装膜 CDTE量子点 荧光 汞离子 

分 类 号：O657.31[理学—分析化学]