首页|Photo-induced Ag modulating carbon dots:Greatly improved fluorescent properties and derived sensing application
Photo-induced Ag modulating carbon dots:Greatly improved fluorescent properties and derived sensing application
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Carbon dots(CDs)have been attracted much attention and widely studied due to their excellent fluo-rescence(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 en-hanced 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.
Carbon dotsPhoto-induced Ag modulatingFluorescent enhancementHigh quantum yieldDerived sensing applicationSulfide determination
Department of Chemistry,Sichuan University,Chengdu 610064,China
Institute of Quality Standard and Testing Technology for Agro-products,Sichuan Academy of Agricultural Sciences,Chengdu 610066,China
Key Laboratory of Aviation Fuel & Chemical Airworthiness and Green Development,The Second Research Institute of Civil Aviation Administration of China,Chengdu 610041,China
School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China
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国家自然科学基金国家自然科学基金Open Research Fund of the School of Chemistry and Chemical Engineering,Henan Normal University
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