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. 2018 Feb 27;8(3):132. doi: 10.3390/nano8030132

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The real time response curves (a) and the response values (b) to different concentrations of ethanol of Co₃O₄ and Co₃O₄/pCNH composite based sensor at the operation temperature of 210 °C.