N-doped carbon quantum dots as fluorescent probes for highly selective and sensitive detection of Fe^3+ ions

查看全文 作　　者：Xiangyi [1]Deng;Yali [1]Feng;Haoran [2]Li;Zhuwei [2]Du;Qing [1]Teng;Hongjun [1]Wang

机构地区：[1]School of Civil and Resource Engineering University of Science and Technology Beijing,Beijing 100083,China;[2]State Key Laboratory of Biochemical Engineering Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Particuology》索引2018年第16卷第6期,共7页

基　　金：Major Science and Technology Program for Water Pollution Control and Treatment (2015ZX07205-003);the China Ocean Mineral Resources Research &Development Program (DY125-15-T-08);the National Natural Science Foundation of China (21176026,21176242). 摘　　要：To investigate the effect of nitrogen on the photoluminescence properties of carbon quantum dots (CO Ds), N-doped carbon quantum dots (N-CQDs)were synthesized by one-step hydrothermal treatment using biomass tar as the carbon precursor.As an inevitable organic pollutant,the unsaturated bonds in biomass tar,such as carboxylic acids,aldehydes,and aromatics,are favorable for formation of the graphitic carbon lattice.The obtained N-CQDs are spherical with an average particle size of 2.64nm and the crystal lattice spacing is 0.25nm,corresponding to the (100)facet of graphitic carbon.The N-CQDs emit bright blue photoluminescence under 365nm ultraviolet light,and they have excellent water solubility and stability with a high quantum yield of 26.1%.Coordination between the functional groups on the N-CQD surface and Fe^3+ ions is promoted because of the improved electronic properties and surface chemical reactivity caused by N atoms,leading to a significant fluorescence quenching effect of the N-CQDs in the presence of Fe^3+ions with high selectivity and sensitivity.There is a linear relationship between In (Fo/F)and the Fe^3+ concentration in the N-CQD concentration range 0.06-1400μmol/L with a detection limit of 60nmol/L, showing that the N-CQ.Ds have great potential as a fluorescent probe for Fe^3+detection. 关键词：N-DOPED carbon quantum DOTS Fe^3+ion detection FLUORESCENCE QUENCHING Biomasstar

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N-doped carbon quantum dots as fluorescent probes for highly selective and sensitive detection of Fe^3+ ions

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