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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. 6 — Synthesis of CdS nanorod arrays and their applications in flexible piezo-driven active H₂S sensors. a Schematic diagram showing the structural design of the piezo-driven active H₂S sensor based on CdS nanorod arrays. b SEM image of CdS NR arrays grown on Ti foil in a top view (the inset is an enlarged view of a selected area). c HRTEM and SAED pattern of the tip region of a CdS nanorod. d The piezoelectric voltage response of a device in dry air, H₂S and pure oxygen at room temperature. The working mechanism of a CdS piezo-driven active H₂S sensor. e The carrier density and depletion layer in CdS nanorods in H₂S without compression and piezoelectric output under mechanical deformation. Figures adapted from [73]