Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 255, Issue -, Pages 3505-3515Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.09.184
Keywords
SnO2-decorated NiO; Heterojunction; Toluene; Gas sensor
Funding
- National Key Research and Development Program [2016YFC0207300]
- National Nature Science Foundation of China [61503148, 61520106003, 61327804, 61374218]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National High-Tech Research and Development Program of China (863 Program) [2013AA030902, 2014AA06A505]
- Science and Technology Development Program of Jilin Province [20170520162JH]
- China Postdoctoral Science Foundation funded project [2015M580247]
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In this work, an ultrasensitive and low detection limit of toluene gas sensor based on SnO2-decorated NiO nanostructure synthesized via a simple hydrothermal route was described. The test results demonstrated that the sensor based on SnO2-decorated NiO nanostructure showed excellent sensitivity and selectivity toward toluene, giving a high response of 66.2-100 ppm, which was 50 times higher than that of the pure NiO nanospheres (1.3-100 ppm). Additionally, the sensor had surpassingly low detection limit (ppb-level), showing a response of 1.2-10 ppb toluene. Besides, the sensor also exhibited anti-humidity properties in some way, giving an acceptable response (11.1-10 ppm) to toluene at 90% relative humidity. The ultrasensitive characteristics and low detection limit could be explained from the variation of the carrier concentration caused by the change of the thickness of near-surface hole accumulation layer between p-type NiO and n-type SnO2. Furthermore, the increase of oxygen adsorption also improved the sensing performance. (C) 2017 Published by Elsevier B.V.
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