【作者】 邹文生； 乔俊琴； 胡忻； 葛欣； 练鸿振；

【Author】 Wen-sheng Zou,J.Q.Qiao,X.Hu,X.Ge,H.Z Lian School of Chemistry & Chemical Engineering and Center of Materials Analysis,Nanjing University,22 Hankou Road,Nanjing,210093

【机构】 南京大学化学化工学院； 南京大学现代分析中心；

【摘要】 <正>将量子点的优势(如可在量子点表面化学修饰功能基团或装饰识别受体)与室温磷光(RTP)的优势(如避免体系的自荧光与散射光)相结合,可用于分析物的室温磷光传感、化学计量测定成像和杂化比率化学更多还原

【Abstract】 Cobalt(Co 2+) doped(CoD) ZnS QDs are synthesized in aqueous solution and characterized for the first time.L-Cysteine(L-Cys) ligands on the surface of CoD ZnS QDs can bind 2,4,6-trinitrotoluene(TNT) to form Meisenheimer complexes(MHCs) mainly through acid-base pairing interaction between TNT and L-cys and the assistance of hydrogen bonding and electrostatic co-interactions among L-cys intermolecules.The interdots aggregation induced by MHCs greatly influenced light scattering property of the QDs aqueous solution,thus,Rayleigh scattering(RS) enhancement at defect-related emission wavelength and its left side was observed under the excitation of violet light of CoD ZnS QDs.RS enhancement,combining with TNT anions induced quenching of orange transition emission,resulted in change of colorimetric visualization of the investigated system.Therefore,a novel CoD ZnS QDs-based hybrid colorimetric sensor has been developed for simply and sensitively analyzing TNT in water.This colorimetric probe can assay down to 25 nM TNT in solution without interference from matrix of real water samples and other nitro aromatic compounds更多还原