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. 2018 Jul 13;10(4):64. doi: 10.1007/s40820-018-0218-0

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© The Author(s) 2018

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. 8 — a Schematic of acetone sensing mechanism with Pd–ZnO/ZnCo₂O₄ hollow spheres. b Temperature-dependent acetone sensing characteristics to 5 ppm in temperature range of 150–300 °C. c Dynamic acetone sensing responses in concentration range of 0.4–5 ppm at 250 °C of ZnCo₂O₄ powders, ZnCo₂O₄ hollow spheres, ZnO/ZnCo₂O₄ hollow spheres, and Pd–ZnO/ZnCo₂O₄ hollow spheres. d Selective acetone detection characteristics of Pd–ZnO/ZnCo₂O₄ hollow spheres. e Dynamic resistance transition properties of samples toward 5 ppm acetone at 250 °C.

Reprinted with permission from [103]. Copyright (2017) Macmillan Publishers Limited