• 文献标题:   One-pot green synthesis of oxygen-rich nitrogen-doped graphene quantum dots and their potential application in pH-sensitive photoluminescence and detection of mercury(II) ions
  • 文献类型:   Article
  • 作  者:   SHI BF, ZHANG LL, LAN CQ, ZHAO JJ, SU YB, ZHAO SL
  • 作者关键词:   oxygenrich nitrogendoped graphene quantum dot, fluorescence probe, green synthesi, phsensitive photoluminescence, mercury
  • 出版物名称:   TALANTA
  • ISSN:   0039-9140 EI 1873-3573
  • 通讯作者地址:   Guangxi Normal Univ
  • 被引频次:   86
  • DOI:   10.1016/j.talanta.2015.04.059
  • 出版年:   2015

▎ 摘  要

Nitrogen doping has been a powerful method to modulate the properties of carbon materials for various applications, and N-doped graphene quantum dots (GQDs) have gained remarkable interest because of their unique chemical, electronic, and optical properties. Herein, we introduce a facile one-pot solid-phase synthesis strategy for N-doped GQDs using citric acid (CA) as the carbon source and 3,4-dihydroxy-L-phenylalanine (L-DOPA) as the N source. The as-prepared N-GQDs with oxygen-rich functional groups are uniform with an average diameter of 12.5 nm. Because of the introduction of nitrogen atoms, N-GQDs exhibit excitation-wavelength-independent fluorescence with the maximum emission at 445 nm, and a high quantum yield of 18% is achieved at an excitation wavelength of 346 nm. Furthermore, a highly efficient fluorosensor based on the as-prepared N-GQDs was developed for the detection of Hg2+ because of the effective quenching effect of metal ions via nonradiative electron transfer. This fluorosensor exhibits high sensitivity toward Hg2+ with a detection limit of 8.6 nM. The selectivity experiments reveal that the fluorescent sensor is specific for Hg2+. Most importantly, the practical use of the sensor based on N-GQDs for Hg2+ detection was successfully demonstrated in river-water samples. (C) 2015 Elsevier B.V. All rights reserved.