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. 2020 Jan 21;12:33. doi: 10.1007/s40820-019-0363-0

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — a SEM image of the Co₃O₄ microspheres, b, c TEM images of the hollow Co₃O₄ microspheres showing that the microspheres are composed of 2D nanosheets, d dynamic gas sensing transients of the sensors to ethanol with different concentrations at 220 °C. e Response of the sensor to various ethanol concentrations at 220 °C. f Long-term stability of the sensor to 30 ppm ethanol at 220 °C.

Adapted with permission from Ref. [201]. Copyright 2017 Elsevier