title: A high-response ethanol gas sensor based on one-dimensional TiO2/V2O5 branched nanoheterostructures.
abstract: Hierarchical nanostructures with much increased surface-to-volume ratio have been of significant interest for prototypical gas sensors. Herein we report a novel resistive gas sensor based on TiO2/V2O5 branched nanoheterostructures fabricated by a facile one-step synthetic process, in which well-matched energy levels induced by the formation of effective heterojunctions between TiO2 and V2O5, a large Brunauer-Emmett-Teller surface area and complete electron depletion for the V2O5 nanobranches induced by the branched-nanofiber structures are all beneficial to the change of resistance upon ethanol exposure. As a result, the ethanol sensing performance of this device shows a lower operating temperature, faster response/recovery behavior, better selectivity and about seven times higher sensitivity compared with pure TiO2 nanofibers. This study not only confirms the gas sensing mechanism for performing enhancement of branched nanoheterostructures, but also proposes a rational approach to the design of nanostructure-based chemical sensors with desirable performance.
authors.affiliation: National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, PO Box 919-111, Mianyang, Sichuan 621900, People's Republic of China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhou
authors.forename: Chuanmin
authors.initials: C
authors.lastname: Meng
authors.forename: Zhao
authors.initials: Z
authors.lastname: Gao
authors.forename: Xiuxia
authors.initials: X
authors.lastname: Cao
authors.forename: Xuhai
authors.initials: X
authors.lastname: Li
authors.forename: Liang
authors.initials: L
authors.lastname: Xu
authors.forename: Wenjun
authors.initials: W
authors.lastname: Zhu
authors.forename: Xusheng
authors.initials: X
authors.lastname: Peng
authors.forename: Botao
authors.initials: B
authors.lastname: Zhang
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Lin
authors.forename: Lixin
authors.initials: L
authors.lastname: Liu