High-quality PVD graphene growth by fullerene decomposition on Cu foils

Carbon
J AzpeitiaM F López

Abstract

We present a new protocol to grow large-area, high-quality single-layer graphene on Cu foils at relatively low temperatures. We use C60 molecules evaporated in ultra high vacuum conditions as carbon source. This clean environment results in a strong reduction of oxygen-containing groups as depicted by X-ray photoelectron spectroscopy (XPS). Unzipping of C60 is thermally promoted by annealing the substrate at 800ºC during evaporation. The graphene layer extends over areas larger than the Cu crystallite size, although it is changing its orientation with respect to the surface in the wrinkles and grain boundaries, producing a modulated ring in the low energy electron diffraction (LEED) pattern. This protocol is a self-limiting process leading exclusively to one single graphene layer. Raman spectroscopy confirms the high quality of the grown graphene. This layer exhibits an unperturbed Dirac-cone with a clear n-doping of 0.77 eV, which is caused by the interaction between graphene and substrate. Density functional theory (DFT) calculations show that this interaction can be induced by a coupling between graphene and substrate at specific points of the structure leading to a local sp(3) configuration, which also contribute to the D-b...Continue Reading

Citations

Apr 21, 2018·Physical Chemistry Chemical Physics : PCCP·José I MartínezJulio A Alonso
Jul 20, 2019·Nanoscale·Irene PalacioJoséÁngel Martín-Gago
Dec 11, 2020·Faraday Discussions·Leandra Pereira SantosFernando Galembeck
Dec 29, 2021·Chemical Reviews·Kyoung Won ChoDae-Hyeong Kim

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