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. 2019 Jul 5;19(13):2966. doi: 10.3390/s19132966

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© 2019 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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(a) Response of electrolyte-gated graphene FET conductance to pH. (b) Solution-gated epitaxial graphene FET as a pH sensor. (c) Photograph of solution-gated graphene FET on the PEN substrate. (d) AFM image of the completely cleaned graphene surface (e) AFM image of the graphene surface with resist residues. (f) Scheme of the ultrasensitive and flexible graphene FET bioelectronic nose. (g) The response of OG, NG and pristine bilayer graphene to the AB solution at various concentrations. (h) Electrical stability of the graphene bioelectronic nose. Reprinted with permission from References [99,118,119,121].