This talk addresses the most important challenges associated with plasma-assisted mechanisms of GNWs dealing with the growth and doping of GNWs. From this point of view, it’s clear the importance of a gas mixtures and plasma’s properties. In these systems, plasma parameters including the densities of ions and radicals are regulated by the discharge parameters like power, gas mixture ratio, gas flow, and pressure, whereas the main challenge is connected to understanding the role of plasma species in growth and their efficient control for improving the quality and selectively modifying properties of the synthesized GNW. Substrate used for growth GNW is also important since it allows various things like tuning carrier mobility in synthesized structures or use of different and more aggressive environments, e.g. high temperatures. For these purposes, different substrates such as 2D sheets (h-BN, MoS2), dielectric substrates (Si, SiN, Al2O3, SiO2) or transitional metal substrates (Ni, Cu, Co) are applied. Another challenge is material doping and understanding the mechanism of plasma doping. Nitrogen functionalization and doping is one of the potential directions how to alter the electronic properties, the oxygen plasma treatment for example helps to enhance surface morphological properties and widening band gaps, etc. [3]. In this perspective, the talk will highlight the recent progress in the field of building GNW including the processing, functionalization, and future challenges that we have to address in GNW synthesis.
This work has received funding from European Union’s Horizon 2020 research and innovation program under grant agreement No. 766894.
Reference
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[2] M. Li, D. Liu, D. Wei, X. Song, D. Wei, and A. T. S. Wee, “Controllable Synthesis of Graphene by Plasma-Enhanced Chemical Vapor Deposition and Its Related Applications,” Advanced Science, vol. 3, no. 11. 2016.
[3] A. Dey, A. Chroneos, N. S. J. Braithwaite, R. P. Gandhiraman, and S. Krishnamurthy, “Plasma engineering of graphene,” Appl. Phys. Rev., vol. 3, no. 2, 2016.