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. 2017 Aug 27;17(9):1971. doi: 10.3390/s17091971

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© 2017 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/).

PMC Copyright notice

(a) SEM image of MWCNTs/TiO₂ xerogel film; (b) CO sensing properties of pure TiO₂ xerogel film and MWCNTs/TiO₂ xerogel film to 50 ppm CO at 350 °C [151]. Copyright 2013 Elsevier.