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. 2018 Mar 22;18(4):941. doi: 10.3390/s18040941

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© 2018 by the authors.

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/).

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Characterizations of graphene-based microfiber structures. (a) Visible scattering, optical microscope, and SEM pictures of a graphene-wrapped hot drawn microfiber. (b) A false-colored SEM picture of a graphene-wrapped microfiber etched chemically. (c) Light scattering enhancement due to the graphene. (d) SEM of an etched microfiber covered by reduced GO. (e) Raman spectra. (f) Measured X-ray photoelectron spectroscopy (XPS) results. Here figures (a–d) are reproduced from Refs. [45,46,74,76], respectively.