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. 2018 Nov 6;6:540. doi: 10.3389/fchem.2018.00540

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Copyright © 2018 Lu, Zhou, Wang, Wei, Xu and Gui.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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A schematic of the H₂S sensing mechanism of the ZnO-SnO₂ nanofibers (A) when the gas sensor is exposed in air (B) when the gas sensor is exposed in H₂S (E_f is Fermi level; E_c is conduction band; E_v is valence band; E_g is band gaps).