Open AccessA novel ethanol gas sensor based on TiO2/Ag0.35V2O5 branched nanoheterostructures
Author(s) -
Yuan Wang,
Lixin Liu,
Chao Meng,
Yun Zhou,
Guoqing Zhao,
Xuhai Li,
Xiuquan Cao,
Liang Xu,
Weiliang Zhu
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep33092
Subject(s) - heterojunction , nanostructure , materials science , selectivity , resistive touchscreen , nanotechnology , nanofiber , sensitivity (control systems) , rational design , optoelectronics , computer science , chemistry , electronic engineering , catalysis , engineering , computer vision , biochemistry
Much greater surface-to-volume ratio of hierarchical nanostructures renders them attract considerable interest as prototypical gas sensors. In this work, a novel resistive gas sensor based on TiO 2 /Ag 0.35 V 2 O 5 branched nanoheterostructures is fabricated by a facile one-step synthetic process and the ethanol sensing performance of this device is characterized systematically, which shows faster response/recovery behavior, better selectivity, and higher sensitivity of about 9 times as compared to the pure TiO 2 nanofibers. The enhanced sensitivity of the TiO 2 /Ag 0.35 V 2 O 5 branched nanoheterostructures should be attributed to the extraordinary branched hierarchical structures and TiO 2 /Ag 0.35 V 2 O 5 heterojunctions, which can eventually result in an obvious change of resistance upon ethanol exposure. This study not only indicates the gas sensing mechanism for performance enhancement of branched nanoheterostructures, but also proposes a rational approach to design nanostructure based chemical sensors with desirable performance.