Photonics of shungite quantum dots

Shungite quantum dots are associated with nanosize fragments of reduced graphene oxide similarly to synthetic graphene quantum dots thus forming a common class of graphene quantum dots (GQDs). Colloidal dispersions of powdered shungite in water, carbon tetrachloride, and toluene form the ground for the GQD photonic peculiarities manifestation. Morphological study shows a steady trend of GQDs to form fractals and a drastic change in the colloids fractal structure caused by solvent was reliably established. Spectral study reveals a dual character of emitting centers: individual GQDs are responsible for the spectra position while the fractal structure of GQD colloids provides high broadening of the spectra due to structural inhomogeneity of the colloidal dispersions and a peculiar dependence 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 GQD photonics. © 2016 by Taylor and Francis Group, LLC.

Authors
Razbirin B.S.1 , Rozhkova N.N.2 , Sheka E.F. 3
Publisher
CRC Press
Language
English
Pages
425-437
Status
Published
Year
2016
Organizations
  • 1 Ioffe Physical-Technical Institute, RAS, St. Petersburg, Russian Federation
  • 2 Institute of Geology Karelian Research Centre RAS, Petrozavodsk, Russian Federation
  • 3 People's Friendship University of Russia, Moscow, Russian Federation
Date of creation
19.10.2018
Date of change
19.10.2018
Short link
https://repository.rudn.ru/en/records/article/record/3954/
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