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. 2016 Sep 12;6:33092. doi: 10.1038/srep33092

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Gas sensing properties versus different operating temperatures of the pure TiO₂ nanofibers and TiO₂/Ag_0.35V₂O₅ branched nanoheterostructures based sensors exposed to 100 ppm ethanol. The inset shows the corresponding responses. (b) Reproducibility of the two sensors exposed to 100 ppm successive ethanol vapors (10 cycles) at 350 °C. The inset is the typical response and recovery curves of the two different types of sensors. (c) Dynamic response-recovery curves of the two sensors to ethanol vapors at 350 °C in the concentration sequence of 20, 50, 100, 500 and 1000 ppm. The inset is the corresponding responses. (d) Selective tests of TiO₂/Ag_0.35V₂O₅ branched nanoheterostructures compared with TiO₂ nanofibers based sensors exposed to 100 ppm ethanol (Eth), acetone (Ace), ammonia (Amm), methanol (Met), and toluene (Tol) at 350 °C.