Carbon-based dots co-doped with nitrogen and sulfur for high quantum yield and excitation-independent emission

Angew Chem Int Ed Engl. 2013 Jul 22;52(30):7800-4. doi: 10.1002/anie.201301114. Epub 2013 Jun 11.

Abstract

Helpful elements: A facile bottom-up method using citric acid and L-cysteine as a precursor has been developed to prepare graphene quantum dots (GQDs) co-doped with nitrogen and sulfur. A new type and high density of surface state of GQDs arises, leading to high yields (more than 70 %) and excitation-independent emission. FLQY = fluorescence quantum yield.

Keywords: doped materials; graphene; nitrogen; quantum dots; sulfur.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Citric Acid / chemistry*
  • Cysteine / chemistry*
  • Fluorescence
  • Graphite / chemistry*
  • Materials Testing
  • Nitrogen / chemistry*
  • Quantum Dots*
  • Sulfur / chemistry*

Substances

  • Citric Acid
  • Sulfur
  • Graphite
  • Cysteine
  • Nitrogen