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. 2018 Mar 29;9:1288. doi: 10.1038/s41467-018-03721-y

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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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Fig. 2 — Characterization of the grown graphene. a EDS spectra of the Ni tip before (black) and after (red) graphene coating. b Typical Raman spectra obtained from the surface of Ni tip coated with graphene with a 532 nm excitation laser. c Hexagonal electron diffraction pattern of graphene surface. Scale bar, 5 nm⁻¹. d High-resolution TEM image of the graphene surface showing the lattice fringes, and inset is the corresponding FFT pattern from the TEM image. e HRTEM image on the edge of the graphene flake. Scale bar, 5 nm (d, e)