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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. 4 — Conversion of PN junction influencing the piezoelectric output of a CuO/ZnO nanoarray PENG and its application as a room-temperature self-powered active H₂S sensor. a Schematic diagram showing the structure of the self-powered active gas sensor with two Kapton boards as the frame. b SEM image of CuO/ZnO nanoarrays on the top view (the inset is an enlarged view of a selected area). c The sensitivity of the device upon exposure to different concentrations of H₂S with one device repeatedly compressed by a constant applied strain of 0.012% at a frequency of 0.8 Hz. d The H₂S sensing mechanism of the self-powered active gas sensor based on CuO/ZnO PN-junction nanoarrays driven by compressive strain. Figures adapted from [71]