title: Polymer composite fluorescent hydrogel film based on nitrogen-doped carbon dots and their application in the detection of Hg2+ions.
abstract: A simple microwave-assisted solvothermal method was used to prepare fluorescent nitrogen-doped carbon dots (N-CDs) with high fluorescence quantum yield (79.63%) using citric acid and N-(2-hydroxyethyl)ethylenediamine as starting materials. The PVAm-g-N-CDs grafted products were synthesized by amide bond formation between the carboxylic groups of N-CDs and amine groups of polyvinylamine (PVAm). Fluorescent hydrogel films (PVAm-g-N-CDs/PAM) were synthesized by interpenetration polymer network polymerization of PVAm-g-N-CDs and acrylamide (AM). When used for ion detection, we found that the fluorescence of the hydrogel films was clearly quenched by addition of Hg2+. Repeatability tests on using the hydrogel films for Hg2+detection showed that they could be applied at least three times. The PVAm-g-N-CDs/PAM could serve as an effective fluorescent sensing platform for sensitive detection of Hg2+ions with a detection limit of 0.089 μmol/L. This work may offer a new approach for developing recoverable and sensitive N-CDs-based sensors for biological and environmental applications.
authors.affiliation: School of Chemistry and Material Science, Guangxi Teachers Education University, Nanning, People's Republic of China.
authors.forename: Shujuan
authors.initials: S
authors.lastname: Yu
authors.affiliation: School of Chemistry and Material Science, Guangxi Teachers Education University, Nanning, People's Republic of China.
authors.forename: Kuan
authors.initials: K
authors.lastname: Chen
authors.affiliation: School of Chemistry and Material Science, Guangxi Teachers Education University, Nanning, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: School of Chemistry and Material Science, Guangxi Teachers Education University, Nanning, People's Republic of China.
authors.forename: Yongfei
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: School of Chemistry and Material Science, Guangxi Teachers Education University, Nanning, People's Republic of China.
authors.forename: Xuehong
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004983:Ethanolamines / Q000737:chemistry; D005453:Fluorescence; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods*; D008628:Mercury / Q000032:analysis*; D009584:Nitrogen / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry
chemical_list: D004983:Ethanolamines; D007477:Ions; D011108:Polymers; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D002244:Carbon; D008628:Mercury; D009584:Nitrogen; C035835:N-(2-hydroxyethyl)ethylenediamine
keywords: Hg2+; carbon dots; hydrogel film; ion detection; polyvinylamine