SPECTRAL PROPERTIES OF SHUNGITE QUANTUM DOTS

A low-temperature study has been performed for aqueous shungite, carbon tetrachloride, and toluene dispersions. Spectral characteristics for graphene quantum dots (GQDs) of shungite, attributed to individual fragments of reduced graphene oxide (rGO), reveal a dual character of the dispersions emitting centers: individual GQDs are responsible for the spectra position while fractal structure of GQD colloids provides large broadening of the spectra due to structural inhomogeneity of the colloidal dispersions and a peculiar dependence of photoluminescence of dispersions on excitation wavelength. For the first time, photoluminescence spectra of individual GQDs were observed in frozen toluene dispersions, which pave the way for a theoretical treatment of GQDs photonics.

Authors
Razbirin B.S.1 , Rozhkova N.N.2 , Sheka E.F. 3 , Nelson D.K.1 , Starukhin A.N.1 , Goryunov A.S.4
Publisher
ST PETERSBURG NATL RESEARCH UNIV INFORMATION TECHNOLOGIES, MECH & OPTICS
Number of issue
2
Language
English
Pages
217-233
Status
Published
Volume
5
Year
2014
Organizations
  • 1 Ioffe Physical-Technical Institute
  • 2 Institute of Geology Karelian Research Centre RAS
  • 3 Peoples’ Friendship University of Russia
  • 4 Institute of Biology Karelian Research Centre RAS
Keywords
graphene quantum dots; fractals; photoluminescence; colloidal dispersions; shungite
Date of creation
09.07.2024
Date of change
09.07.2024
Short link
https://repository.rudn.ru/en/records/article/record/131739/
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