• 文献标题:   Nitrogen-doped graphene quantum dots prepared by electrolysis of nitrogen-doped nanomesh graphene for the fluorometric determination of ferric ions
  • 文献类型:   Article
  • 作  者:   YANG F, BAO WJ, LIU TX, ZHANG B, HUANG S, YANG W, LI Y, LI N, WANG CX, PAN CW, LI YF
  • 作者关键词:   carbon cloth electrode, electrochemical oxidation, fluorescence lifetime, dynamic quenching, band gap
  • 出版物名称:   MICROCHIMICA ACTA
  • ISSN:   0026-3672 EI 1436-5073
  • 通讯作者地址:   China Univ Petr
  • 被引频次:   1
  • DOI:   10.1007/s00604-020-04294-8
  • 出版年:   2020

▎ 摘  要

Nitrogen-doped graphene quantum dots (N-GQDs) were synthesized by direct electrolysis of a carbon cloth electrode coated with nitrogen-doped nanomesh graphene (NG) in high yield (similar to 25%). The N-GQDs emit intense blue fluorescence with a quantum yield (QY) of 10%3%. Meanwhile, the N-GQDs are rich in hydroxyl, carboxyl, basic pyridinic nitrogen, and nitro groups, which are conducive to strengthen the interaction between N-GQDs and Fe3+ for highly sensitive determination of Fe3+ ions. Specifically, the determination for Fe3+ was conducted at different concentrations of N-GQD solution with a wide linear range of 10-1000 mu M (150 mu gmL(-1)) and a low detection limit of 0.19 mu M (10 mu gmL(-1)). Moreover, the fluorescence quenching mechanism illustrated that the functional groups generated by electrochemical oxidation enhanced the interaction of N-GQDs and Fe3+, and the narrow band gap (2.83 eV) of N-GQDs accomplished electron transfer from N-GQDs to Fe3+ easily.