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. 2017 Aug 31;7:10225. doi: 10.1038/s41598-017-10355-5

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© The Author(s) 2017

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) Current–voltage characteristics extracted from TLM at 10-μm gap. The inset indicates TLM fabrication processes depending on the different locations of the graphene layer: a graphene layer on 150-nm-thick Ag (“GR on Ag”) and 150-nm-thick Ag on a graphene layer (“Ag on GR”). (b) The schematic illustration shows current flows depending on the existence and location of the graphene layer.