定位在ZIF-8表面的金纳米簇以提高其荧光强度及检测高锰酸根离子的选择性  

Gold Nanoclusters Positioned on Outer Surface of Zeolitic Imidazolate Framework-8 for Improvement of Emission Intensity and Selectivity in Detection of Permanganate

作　　者：韩冰雁 闫琴[1,2] 辛泽 燕琪芳 姜静美 HAN Bing-Yan;YAN Qin;XIN Ze;YAN Qi-Fang;JIANG Jing-Mei(State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,China;School of Chemical Engineering,Dalian University of Technology,Panjin 124221,China)

机构地区：[1]大连理工大学精细化工国家重点实验室,大连116024 [2]大连理工大学化工学院,盘锦124221

出　　处：《分析化学》2020年第8期1025-1032,共8页Chinese Journal of Analytical Chemistry

基　　金：大连理工大学精细化工国家重点实验室开放课题基金(No.KF1807)资助。

摘　　要：荧光金属纳米簇用于荧光分析时通常不具有选择性,限制了其传感应用。本研究合成了一种将金纳米簇(AuNCs)定位在沸石咪唑酯骨架-8(ZIF-8)表面的纳米复合物(AuNCs/ZIF-8),将其用于特异性检测MnO4^-。采用透射电子显微镜(TEM)、扫描电子显微镜和傅里叶变换红外光谱证明在此纳米复合物中,AuNCs通过配位作用固定在ZIF-8的外表面。与单独的AuNCs相比,此纳米复合物提高了AuNCs的光致发光强度,消除了Cu^2+和Hg^2+的干扰,对MnO4^-显示出优异的“Turn off”选择性。紫外-可见吸收光谱和TEM结果表明,MnO4^-对AuNCs/ZIF-8纳米复合物的传感机理基于荧光内滤效应。AuNCs/ZIF纳米复合物的猝灭与MnO4^-浓度在1~30μmol/L范围内有良好的线性关系,检出限低至0.64μmol/L。Fluorescent metal nanoclusters usually do not have specific selectivity,which limits their sensing application.Herein,the gold nanoclusters/zeolitic imidazolate framework-8(AuNCs/ZIF-8)nanocomposites were developed for specific detection of MnO4^-.Transmission electron microscopy(TEM),scanning electron microscopy(SEM)and Fourier transform infrared(FT-IR)characterization showed that AuNCs were immobilized on the outer surface of ZIF-8 via the coordinative interaction.Compared with individual AuNCs solution,the photoluminescence intensity of AuNCs on AuNCs/ZIF-8 nanocomposites was increased,eliminating the interference of Cu^2+and Hg^2+ions,and demonstrating a better selectivity toward MnO¬4^-.UV-Vis absorption spectra and TEM images showed that the sensing mechanism of MnO4^-resulted from inner filter effect.In addition,a good linearity between photoluminescence intensity of AuNCs/ZIF-8 nanocomposites and MnO4^-concentration in the range of 1-30μmol/L was obtained,with a detection limit of 0.64μmol/L.

关 键 词：沸石咪唑酯骨架-8 金纳米簇 特异性检测 高锰酸根 

分 类 号：O657.3[理学—分析化学] TB383.1[理学—化学]