najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-886Research ArticlePHYSICSФИЗИКАSpectral properties of shungite quantum dotsRazbirinB. S.

Saint Petersburg

RozhkovaN. N.

Petrozavodsk

ShekaE. F.

Moscow

sheka@icp.ac.ruNelsonD. K.

Saint Petersburg

StarukhinA. N.

Saint Petersburg

GoryunovА. S.

Petrozavodsk

Ioffe Physical-Technical Institute, RASRussian FederationInstitute of Geology Karelian Research Centre RASRussian FederationPeoples’ Friendship University of RussiaRussian FederationInstitute of Biology Karelian Research Centre RASRussian Federation20141408202552217–233Copyright © Razbirin B.S., Rozhkova N.N., Sheka E.F., Nelson D.K., Starukhin A.N., Goryunov А.S., 20252025Razbirin B.S., Rozhkova N.N., Sheka E.F., Nelson D.K., Starukhin A.N., Goryunov А.S.Razbirin B.S., Rozhkova N.N., Sheka E.F., Nelson D.K., Starukhin A.N., Goryunov А.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/886

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.

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The authors declare that there are no conflicts of interest present.