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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) The visible light transmittance of CVD graphene films. Inset: OM image; The corresponding (b) Raman and (c) high-resolution XPS C1s spectra; (d) Photograph of the graphene device measured based on the Van der Paul configuration.