• 文献标题:   Facile and scalable preparation of highly luminescent N,S co-doped graphene quantum dots and their application for parallel detection of multiple metal ions
  • 文献类型:   Article
  • 作  者:   SHEN C, GE SY, PANG YY, XI FN, LIU JY, DONG XP, CHEN P
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY B
  • ISSN:   2050-750X EI 2050-7518
  • 通讯作者地址:   Zhejiang Sci Tech Univ
  • 被引频次:   37
  • DOI:   10.1039/c7tb00506g
  • 出版年:   2017

▎ 摘  要

Sensitive and selective detection of metal ions is important for environmental monitoring and biological studies because metal ions play crucial roles in many physiological and pathological processes including cellular metabolism, enzymatic activities, as well as DNA and RNA syntheses. In this work, new nitrogen and sulfur co-doped graphene quantum dots (N, S-GQDs) are synthesized and serve as fluorescence probes for parallel and specific detection of Fe3+, Cu2+ and Ag+ ions. The N, S-GQDs are synthesized based on one-step bottom-up molecular fusion in a hydrothermal process with a high yield of 87.8% and possibility of mass production. The as-prepared N, S-GQDs exhibit a single-layer graphene structure, high crystallinity and uniform size (similar to 2.1 nm). Successful co-doping of N and S atoms in the lattice of GQDs not only enables bright blue fluorescence with high absolute photoluminescence quantum yield (23.2%) but also provides unique selectivity towards some metal ions. With the help of different masking agents, N, S-GQDs are able to differentially detect Fe3+, Cu2+ and Ag+ ions in a mixture with low detection limits (8 nM, 250 nM and 50 nM, respectively). Moreover, detection of Fe3+, Cu2+ and Ag+ in complex biological (serum) and environmental samples (river water) is demonstrated.