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. 2018 Mar 2;8:3944. doi: 10.1038/s41598-018-22274-0

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Optical transmittance spectra of the SLG and MLG electrodes transferred onto a glass substrate following UV/ozone treatment. The inset provides a photo image of graphene film transferred onto a glass substrate with different numbers of graphene layers, from single (G1L) to multi (G2L, G3L, G4L, G5L and G6L) layers. (b) The optical transmittance for G4L increased by at least ~1% after UV/ozone treatment because of the resulting cleaner surface. (c) Raman spectra and (d) sheet resistance of the graphene films with increasing numbers of transferred graphene layers from G1L to G6L.