• 文献标题:   Direct Synthesis of Graphene Quantum Dots with Different Fluorescence Properties by Oxidation of Graphene Oxide Using Nitric Acid
  • 文献类型:   Article
  • 作  者:   ZHAO ML
  • 作者关键词:   graphene quantum dots gqds, fluorescence, hydrothermal method, nitrogen doping
  • 出版物名称:   APPLIED SCIENCESBASEL
  • ISSN:   2076-3417
  • 通讯作者地址:   Chengdu Univ Tradit Chinese Med
  • 被引频次:   5
  • DOI:   10.3390/app8081303
  • 出版年:   2018

▎ 摘  要

Graphene quantum dots (GQDs) play a critical role in many applications in the electrical and optical fields. We develop a simple three-step hydrothermal etching method to prepare GQDs by adopting graphene oxide (GO) as a precursor and nitric acid as an oxidant. We discuss the formation mechanism of GQDs by the characterization of products and intermediates with Scanning electronic microscopy (SEM), Transmission electron microscopic (TEM), Raman, Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Two kinds of GQDs have been obtained after the treatment of GO with different concentrations of nitric acid. The sizes of GQDs are small, with diameters of 3.38 nm and 2.03 nm on average, respectively. When excited with 365 nm UV light, the two kinds of GQDs exhibit green and yellow luminescence; the different optical properties can be attributed to the differences in degree of oxidation and nitrogen doping. The result is important for GQDs in synthesizing and optical field.