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. 2017 May 6;9(4):45. doi: 10.1007/s40820-017-0146-4

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 9 — A self-powered active hydrogen gas sensor with fast response at room temperature based on triboelectric effect. a Schematic of the as-fabricated triboelectric-based H₂ sensor (TEHS). b FESEM images of the micropatterned PDMS surface (the insets show the enlarged view of the micropyramids PDMS). c Cross-section (I) and in-plane (II) micrographs of ZnO nanoparticles. d Variation of open-circuit voltage with and without H₂ exposure. e The pressing and releasing signal peaks of the TEHS. f Response time characteristics of the TEHS. Schematic of the TEHS’s g triboelectric and h sensing mechanisms. Figures adapted from [97]