Spectral properties of shungite quantum dots
Abstract
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.
Supporting agencies: A financial support provided by the Ministry of Science and High Education of the Russian Federation grant 2.8223.2013, Basic Research Program, RAS, Earth Sciences Section5, and grant RFBI 13-03-00422 is highly acknowledged.
About the Authors
B. S. Razbirin
Ioffe Physical-Technical Institute, RAS
Russian Federation
Russian Federation
Saint Petersburg
N. N. Rozhkova
Institute of Geology Karelian Research Centre RAS
Russian Federation
Russian Federation
Petrozavodsk
E. F. Sheka
Peoples’ Friendship University of Russia
Russian Federation
Russian Federation
Moscow
D. K. Nelson
Ioffe Physical-Technical Institute, RAS
Russian Federation
Russian Federation
Saint Petersburg
A. N. Starukhin
Ioffe Physical-Technical Institute, RAS
Russian Federation
Russian Federation
Saint Petersburg
А. S. Goryunov
Institute of Biology Karelian Research Centre RAS
Russian Federation
Russian Federation
Petrozavodsk
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Review
For citations:
Razbirin B.S., Rozhkova N.N., Sheka E.F., Nelson D.K., Starukhin A.N., Goryunov А.S. Spectral properties of shungite quantum dots. Nanosystems: Physics, Chemistry, Mathematics. 2014;5(2):217–233.
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