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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. 2 — Surface free-carrier screening effect on the output of a ZnO NW-based PENG and its potential as a self-powered active gas sensor. a Schematic diagram showing the structural design of the PENG (the inset is a photograph of a typical device). b SEM image of ZnO NW arrays grown on Ti foil in a top view (the inset shows SEM the cross-sectional view image). c HRTEM and SAED pattern taken from the tip region of a ZnO NW. d The working mechanism of the PENG was driven by compressive strain. e The dependence of sensitivity on the ranging concentrations of H₂S vapor. Figures adapted from [59]