Photo-induced Ag modulating carbon dots:Greatly improved fluorescent properties and derived sensing application  

作　　者：Yuwei Wang Ye Li Guixiang Yang Xiaofeng Yang Chenglu Yan Huaqiao Peng Huiyong Wang Juan Du Baozhan Zheng Yong Guo 

机构地区：[1]Department of Chemistry,Sichuan University,Chengdu 610064,China [2]Institute of Quality Standard and Testing Technology for Agro-products,Sichuan Academy of Agricultural Sciences,Chengdu 610066,China [3]Key Laboratory of Aviation Fuel&Chemical Airworthiness and Green Development,The Second Research Institute of Civil Aviation Administration of China,Chengdu 610041,China [4]School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China

出　　处：《Chinese Chemical Letters》2024年第1期338-342,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.U1833202 and 21876117);the Open Research Fund of the School of Chemistry and Chemical Engineering,Henan Normal University(No.2021YB05).

摘　　要：Carbon dots(CDs)have been attracted much attention and widely studied due to their excellent fluorescence(FL)properties,better biocompatibility and outstanding photo/chemical stability.However,the disadvantage of lower quantum yield(QY)still limits its wide application.Herein,we reported a novel and convenient strategy to prepare photo-induced Ag/CDs(p-Ag/CDs)by irradiating the mixed Ag+and hydrophobic CDs(h-CDs)acetone solution with ultraviolet(UV)light.The obtained p-Ag/CDs exhibit a greatly enhanced FL emission together with a blue shift(460 nm)than h-CDs(520 nm).The QY of p-Ag/CDs is measured to be 51.1%,which is 10.4 times higher than that of h-CDs(4.9%),indicating that photo-induced Ag modulation can effectively improve the optical properties of CDs.The mechanisms for the FL enhancement and blue shift of h-CDs are studied in detail.The results prove that the greatly enhanced FL emission is from the generated Ag nanoparticles(AgNPs)by UV light irradiation based on metal-enhanced fluorescence(MEF),and the increased oxygen-contained groups in this process lead to the blue shift in CDs fluorescence.Interestingly,the p-Ag/CDs exhibit higher sensitivity and selectivity for sulfide ions(S2-)detection than that of h-CDs,which have a lower response to S2-.This work not only offers a novel strategy to improve the FL properties of materials but also endows them with new functions and broadens their application fields.

关 键 词：Carbon dots Photo-induced Ag modulating Fluorescent enhancement High quantum yield Derived sensing application Sulfide determination 

分 类 号：TQ127.11[化学工程—无机化工] O657.3[理学—分析化学]