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Researchers from Peoples' Friendship University of Russia Discuss Findings in Quantum Dots (Fractals of graphene quantum dots in photoluminescence of...

August 5, 2014



Researchers from Peoples' Friendship University of Russia Discuss Findings in Quantum Dots (Fractals of graphene quantum dots in photoluminescence of shungite)

By a News Reporter-Staff News Editor at Physics Week -- A new study on Quantum Dots is now available. According to news reporting originating in Moscow, Russia, by VerticalNews journalists, research stated, "Viewing shungite as loosely packed fractal nets of graphene-based (reduced graphene oxide, rGO) quantum dots (GQDs), we consider photoluminescence of the latter as a convincing proof of the structural concept as well as of the GQD attribution to individual rGO fragments. We study emission from shungite GQDs for colloidal dispersions in water, carbon tetrachloride, and toluene at both room and low temperatures."

The news reporters obtained a quote from the research from the Peoples' Friendship University of Russia, "As expected, the photoluminescence of the GQD aqueous dispersions is quite similar to that of synthetic GQDs of the rGO origin. The morphological study of shungite dispersions shows a steady trend of GQDs to form fractals and to drastically change the colloid fractal structure caused by the solvent exchange. Spectral study reveals a dual character of the emitting centers: individual GQDs are responsible for the spectra position while the fractal structure of GQD colloids ensures high broadening of the spectra due to structural inhomogeneity, thus causing a peculiar dependence of the photoluminescence spectra on the excitation wavelength."

According to the news reporters, the research concluded: "For the first time, photoluminescence spectra of individual GQDs were observed in frozen toluene dispersions, which paves the way for a theoretical treatment of the GQD photonics."

For more information on this research see: Fractals of graphene quantum dots in photoluminescence of shungite. Journal of Experimental and Theoretical Physics, 2014;118(5):735-746. Journal of Experimental and Theoretical Physics can be contacted at: Maik Nauka, Interperiodica, Springer, 233 Spring St, New York, NY 10013-1578, USA. (Pleiades Publishing - www.maik.ru)

Our news correspondents report that additional information may be obtained by contacting B.S. Razbirin, Peoples Friendship Univ Russia, Moscow 117198, Russia. Additional authors for this research include N.N. Rozhkova, E.F. Sheka, D.K. Nelson and A.N. Starukhin.

Keywords for this news article include: Moscow, Russia, Eurasia, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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