摘要
A“turn-on”fluorescent sensing strategy was developed for ultrasensitive detection of heavy metal mercury ion(Hg2+)directly in water.It utilized an aqueous soluble aggregation-induced emission(AIE)-active probe,named 1,1,2,2-tetrakis(4-(1Htetrazol-5-yl)phenyl)ethene(TPE-4TA),composing of a luminescent tetraphenylene core and multiple anionic tetrazolate spawns.The probe retained dark when molecularly dissolved in water.However,mercury ions can ligate with multiple tetrazolate groups to form infinite coordination polymer particles spontaneously,thus inducing a fluorogenic AIE response for in situ analysis.Moreover,by embedding this AIE sensing molecules in a hydrophilic polyvinyl alcohol substrate,the resulting hydrogel film allowed in situ detection of Hg^(2+)on a laser-induced fluorescence analysis setup in aqueous environment.This strategy worked effectively in common aqueous environments with pH from 4 to 7.5 and showed high sensitivity(limit of detection down to 0.38 ppb/1.9 nM),good selectivity and a wide linearity range for quantification.This work may lead to a reliable and promising platform for on-site environmental water analysis.
基金
Hunan Provincial Grant for Innovative Province Construction,Grant/Award Number:2019RS2023
Science and Technology Innovation Program of Hunan Province,Grant/Award Number:2020RC5033
Shenzhen Science and Technology Program,Grant/Award Number:RCJC20200714114434015
National Natural Science Foundation of China,Grant/Award Numbers:51922039,T2122011
Natural science foundation of Hunan Province,Grant/Award Number:2020JJ3003
Guangdong Basic and Applied Basic Research Foundation,Grant/Award Number:2020A1515110786
National Key Research and Development Program of China,Grant/Award Number:2020YFC1807302。
作者简介
Correspondence:Sheng Xie,Shenzhen Research Institute of Hunan University,Nanshan District,Shenzhen 518000;State Key Laboratory of Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China.Email:shengxie@hnu.edu.cn;Correspondence:Zebing Zeng,Email:zbzeng@hnu.edu.cn。
