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. 2020 Apr 15;10(4):761. doi: 10.3390/nano10040761

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© 2020 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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32:1 SnO₂/GO (blue line), 32:1 Sn_0.55Ti_0.45O₂/GO (cyan line) and 32:1 TiO₂/GO (fuchsia line) sensor signals towards (a) toluene and (b) acetone molecules. Sensor response intensities towards (c) toluene and (d) acetone species. (e) Histograms displaying a comparison of the response intensity obtained with the solid solutions towards 1 ppm of toluene analyte. (f) Comparison of the intensities at 1 ppm of toluene (orange) and acetone (grey) obtained with the most promising 32:1 SnO₂/GO, 32:1 TiO₂/GO and 32:1 Sn_0.55Ti_0.45O₂/GO samples. Tests were carried out in simulated air (20% O₂–80% N₂) at 350 °C, without UV light.