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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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Optical gas sensors based on graphene-wrapped microfiber structures. (a) NH₃/H₂O sensor based on CVD graphene-microfiber multimode interferometer, (b) NH₃ gas sensor based on ZnO-GO-covered graphene-microfiber multimode interferometer, (c) NH₃ gas sensor based on SPR on a PMMA/graphene/Cu-covered microfiber. Here the figures are reproduced from Refs. [46,91,92].