Silicon quantum dots-based fluorescent sensor for the detection of cobalt with high sensitivity and selectivity  

作　　者：Ebtihaj Mohammed Sullam Khalid Mohammed Adam Juanjuan Liu Hongli Chen Jianxi Xiao 

机构地区：[1]State Key Laboratory of Applied Organic Chemistry,College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China [2]Department of Chemistry,Faculty of Education,University of Kordofan,El Obeid 51111,Sudan

出　　处：《Chinese Chemical Letters》2024年第1期451-455,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21874060,22074057 and 21775059).

摘　　要：Fluorescent silicon quantum dots(Si QDs)were hydrothermally synthesized from a mixture of 3(2-aminoethylamino)propyl(dimethoxymethylsilane)(AEAPDMMS)and poly(vinylpyrrolidine)(PVP).The resulting Si QDs exhibited good water solubility and high stability.Under the optimized conditions,the probe revealed an excellent linear fluorescence quenching effect on Co2+ranging from 1μmol/L to 120μmol/L with a limit of detection of 0.37μmol/L(based on 3 s/k).The quenching mechanism was studied,showing that static quenching(SQE)causes the main effect.Furthermore,the test paper based on Si QDs was prepared,which is cost-effective,high sensitivity,good selectivity,easy to use and show excellent anti-interference capability.This method was applied to analyze the content of Co2+in environmental water samples with satisfying results.

关 键 词：Silicon quantum dots FLUORESCENCE Poly(vinylpyrrolidine) Test paper Cobalt detection 

分 类 号：X832[环境科学与工程—环境工程] O657.3[理学—分析化学]