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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 attached on microfibers by using (a) mode-field analysis and power metering; (b) MZI interferometer; (c) Sensing performance of the graphene-based acetone gas sensor; (d) Sensing performance of the graphene-based MZI sensor for NH₃ gas detection. Here the results are reproduced from Ref. [52,84].