This thesis focuses on the study of graphene application in electronics and technology of preparation. In addition to the basic properties of graphene, the theoretical part of the work also describes the methods of its preparation, transmission, characterization and possibilities of application in electronics. The experimental part is divided into three chapters. The first chapter deals with the production of graphene by deposition from the gaseous phase, its transmission and application in the field of solar cells. The Poly(methyl methacrylate) polymer was first used for transfer of graphene, which was later replaced by Rosin due to less contamination of graphene at the end of the transmission process. The second chapter deals with the preparation of quantum dots by exfoliation in the liquid phase from graphite and its application in voltammetry. Voltammetry was utilized in this work to detect hydrogen peroxide using a gold electrode modified by quantum dots from graphene and other dichalcogens (MoS2, MoSe2, WS2, WSe2). In the last chapter, the influence of the substrate and the deposition conditions of graphene is studied by means of a plasma-reinforced phase-out of gas to growth, while the prepared graphene was characterized by imaging and spectroscopic methods. The entire experimental growth of graphene was managed and evaluated using a planned experiment.

No / Here we report a hierarchical composite structure composed of few-layers molybdenum disulfide nanosheets supported by vertical graphene on conductive carbon cloth (MDNS/VG/CC) for high-performance electrochemical hydrogen evolution reaction (HER). In the fabrication, 3D vertical graphene is first prepared on carbon cloth by a micro-wave plasma enhanced chemical vapor deposition (MPCVD) and then few-layers MoS2 nanosheets are in-situ synthesized on the surface of the vertical graphene through a simple hydrothermal reaction. This integrated catalyst exhibits an excellent HER electrocatalytic activity including an onset potential of 50 mV, an overpotential at 10 mA cm(-2) (eta(10)) of 78 mV, a Tafel slop of 53 mV dec(-1), and an excellent cycling stability in acid solution. The excellent catalytic performance can be ascribed to the abundant active edges provided by the vertical MoS2 nanosheets, as well as the effective electron transport route provided by the graphene arrays on the conductive substrate. Moreover, the vertical graphene offers robust anchor sites for MoS2 nanosheets and appropriate intervals for electrolyte infiltration. This not only benefits hydrogen convection and release but also avoids the damaging or restacking of catalyst in electrochemical processes. / This work was financially supported by the National Natural Science Foundation of China (Grant nos. 61176007, 51372213, and 51402343).