• 文献标题:   Theoretical Investigations of Optical Origins of Fluorescent Graphene Quantum Dots
  • 文献类型:   Article
  • 作  者:   WANG JG, CAO S, DING Y, MA FC, LU WG, SUN MT
  • 作者关键词:  
  • 出版物名称:   SCIENTIFIC REPORTS
  • ISSN:   2045-2322
  • 通讯作者地址:   Liaoning Univ
  • 被引频次:   24
  • DOI:   10.1038/srep24850
  • 出版年:   2016

▎ 摘  要

The optical properties of graphene quantum dots (GQDs) were investigated theoretically. We focused on the photoinduced charge transfer and electron-hole coherence of single-layer graphene in the electronic transitions in the visible regions. Surface functionalization with donor or acceptor groups produced a red shift in the absorption spectrum, and electrons and holes were highly delocalized. The recombination of excited, well-separated electron-hole (e-h) pairs can result in enhanced fluorescence. This fluorescence enhancement by surface functionalization occurs because of the decreased symmetry of the graphene resulting from the roughened structure of the surface-functionalized GQDs.