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. 2018 Jun 6;18(6):1857. doi: 10.3390/s18061857

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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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Schematic view (a) and digital image (b) of the laser-scribed rGO-based flexible humidity sensor attached on a nail (e.g., press-on nail wearable sensor), consisting of an indirect laser-scribed rGO film on flexible PP substrate integrated with a copper electrode. (c) The real-time signal responses as measured cyclic capacitance changes from the LDW GO-based humidity sensor, exposed to RH in the range of 20% to 92% at 30 s intervals. (d) The monitored RH changes collected from the real-time data logger correspond to the graph in (c). (e) Schematic drawing of absorption process of water molecules by hydrogen bonding on the partially reduced GO surface after moisture exposure.