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. 2015 Jun 18;5:11040. doi: 10.1038/srep11040

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Copyright © 2015, Macmillan Publishers Limited

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 of Au50-WO₃ nanowire sensors upon exposure to 100 ppm CH₄ at different working temperatures. (b) Gas-sensing properties of pure WO₃ and Au-embedded WO₃ nanowire structures at optimal working temperature of 250 °C upon exposure to 100 ppm CH₄. (c) The responses of sensors to 100 ppm CH₄ at different working temperatures were summarized. (d) The response of Au50-WO₃ nanowire sensor to various CH₄ gas concentrations at optimal working temperature of 250 °C and its summary showing linearity in sensing CH₄ concentration (inset).