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. 2018 May 24;11(6):881. doi: 10.3390/ma11060881

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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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(a) Selected locations of MnO₂/GO and Mn₃O₄/rGO film; (b) the electrical conductivity values of MnO₂/GO and Mn₃O₄/rGO tested by 4-point probes resistivity measurement system, respectively.