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Advances in Materials Science and Engineering
Volume 2018, Article ID 6026437, 11 pages
https://doi.org/10.1155/2018/6026437
Research Article

Sonochemical Preparation and Subsequent Fixation of Oxygen-Free Graphene Sheets at N,N-Dimethyloctylamine-Aqua Boundary

1Institution of the Russian Academy of Sciences, A.A. Baikov Institute of Metallurgy and Materials Science of RAS, Leninsky Prospect 49, Moscow 119334, Russia
2Technological Institute for Superhard and Novel Carbon Materials, Tsentralnaya Street 7a, Troitsk, Moscow 142190, Russia
3Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
4Moscow Institute of Physics and Technology State University, Institutskiy Per. 9, Dolgoprudny, Moscow Region 141700, Russia

Correspondence should be addressed to Elena A. Trusova; moc.liamg@30avosurt

Received 10 July 2017; Accepted 10 October 2017; Published 24 January 2018

Academic Editor: Renal Backov

Copyright © 2018 Elena A. Trusova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, the syntheses of oxygen-free graphene sheets and the method of its fixation at an oil-aqua interface were presented. The graphene sheets were prepared by exfoliation of synthetic graphite powder in an aqua-organic medium under ultrasound irradiation. N,N-Dimethyloctylamine- (DMOA-) aqua emulsion was used as the liquid medium, and pH was equal to 3. The obtained graphene nanosuspension was fractionated by sedimentation and decanted according to the weight. The graphene nanoparticle fractions, differing in configuration and number of layers, have been characterized using transmission electron microscopy (TEM), electron diffraction, HRTEM, Raman spectroscopy, and electron energy loss spectroscopy (EELS). It was found that using a DMOA-aqua mixture as the liquid medium in ultrasonic treatment of synthetic graphite leads to the formation of oxygen-free 1-2-layer graphene sheets attached to the DMOA-aqua interface. The proposed method differs from known ones by using a small amount of more environmentally friendly organic substances. It allows to obtain large quantities of oxygen-free graphene, and finally unconverted graphite can be directed for reuse. The proposed method allows to obtain both 2D graphene sheets with micron linear dimensions and 3D packages with a high content of defects. Both these species are in demand in areas related to the development of new materials with unique electrophysical properties.