Synthesis and modification of pristine and nitrogen-doped carbon dots by combining template pyrolysis and oxidation

Oxidation by HNO3 led to the formation of carbon dots

Sergei Chernyak; Angelina Podgornova; Sergey Dorofeev; Sergey Maksimov; Konstantin Maslakov; Serguei Savilov; Valery Lunin

2019

Scholarcy highlights

  • Few-layer graphene nanoflakes of 15–40 nm have been synthesized by template pyrolysis
  • Oxidation by HNO3 led to the formation of carbon dots
  • TEM, Raman, and XPS data revealed the graphene core of carbon dots with the shell of carboxyl and hydroxyl functionalities
  • The bulk and surface N-doping of the carbon dots affected their photoluminescence in a different way because of the opposite effect on the π-electron system: the core modification led to a blue shift, while the surface amination resulted in a red shift
  • A blue shift was observed for the undoped dots with increasing the synthesis temperature, while more prolonged oxidation led to a red shift
  • Excitation with different wavelengths revealed the inhomogeneity of photoluminescence sites in nitrogen-doped carbon dots

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