Multifunctional N,S-doped and methionine functionalized carbon dots for on−off−on Fe^(3+)and ascorbic acid sensing,cell imaging,and fluorescent ink applying  

作　　者：Zheng Yang Tiantian Xu Shaobing Zhang Hui Li Yali Ji Xiaodan Jia Jianli Li 

机构地区：[1]Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education,College of Chemistry&Materials Science,Northwest University,Xi’an 710127,China [2]College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China [3]Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Land and Resources,Xi’an 710012,China

出　　处：《Nano Research》2023年第4期5401-5411,共11页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22171223,22179107,22077099,and 21807087);the Technology Innovation Leading Program of Shaanxi(No.2020TG−031);the Shaanxi Provincial Natural Science Fund Project(No.2018JQ2061);the Xi’an City Science and Technology Project(Nos.2020KJRC011 and 2019218214GXRC018CG019−GXYD18.4);the Outstanding Youth Science Fund of Xi’an University of Science and Technology(No.2018YQ3-14).

摘　　要：Fluorescent carbon dots(CDs)have been identified as potential nanosensors and attracted tremendous research interests in wide areas including anti-counterfeiting,environmental and biological sensing and imaging in considering of the attractive optical properties.In this work,we present a CDs based fluorescent sensor from polyvinylpyrrolidone,citric acid,and methionine as precursors by hydrothermal approach.The selective quantifying of Fe^(3+)and ascorbic acid(AA)are based on the fluorescent on-off-on process,in which the fluorescent quenching is induced by the coordination of the Fe^(3+)on the surface of the CDs,while the fluorescence recovery is mainly attributed to redox reaction between Fe^(3+)and AA,breaking the coordination and bringing the fluorescence back.Inspired by the good water solubility and biocompatibility,significant photostability,superior photobleaching resistance as well as high selectivity,sensitivity,and interference immunity,which are constructed mainly from the N,S-doping and methionine surface functionalization,the CDs have not only been employed as fluorescence ink in multiple anticounterfeiting printing and confidential document writing or transmitting,but also been developed as promising fluorescence sensors in solution and solid by CDs doped test strips and hydrogels for effectively monitoring and removing of Fe^(3+)and AA in environmental aqueous solution.The CDs have been also implemented as effective diagnostic candidates for imaging and tracking of Fe^(3+)and AA in living cells,accelerating the understanding of their function and importance in related biological processes for the prevention and treatment specific diseases.

关 键 词：carbon dots fluorescent sensors Fe^(3+) ascorbic acid fluorescent ink message encryption 

分 类 号：O62[理学—有机化学]