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Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction.

Authors :
Wang, Ji-Chao
Shi, Weina
Sun, Xue-Qin
Wu, Fang-Yan
Li, Yu
Hou, Yuxia
Source :
Nanomaterials (2079-4991). Feb2020, Vol. 10 Issue 2, p398. 1p.
Publication Year :
2020

Abstract

The development of WO3-based gas sensors for analysis of acetone in exhaled breath is significant for noninvasive diagnosis of diabetes. A series of Fe-doped hexagonal and monoclinic WO3 phase−junction (Fe−h/m−WO3) sensors were synthesized by the hydrothermal calcination method, and the influences of operating temperature and light irradiation on the response were studied. Under light emitting diode (LED) illumination, Fe−h/m−WO3 exhibited higher responses to acetone than those of the undoped WO3-based sensors at an operating temperature of 260 °C with 90% relative humidity, and good linearity between response and acetone concentration (0.5 to 2.5 ppm) was achieved under the 90% relative humidity condition. Meanwhile, the optimal Fe−h/m−WO3 sensor exhibited high selectivity and stability for a duration of three months. The excellent sensing performance of Fe−h/m−WO3 was attributed to the formation of phase−junction and Fe doping, and these were beneficial for the separation of photon−generated carriers and oxygen adsorption on the WO3 surface, promoting the generation of superoxide radicals, which was demonstrated by electron paramagnetic resonance and photocurrent tests. Additionally, the Fe−doped WO3 phase−junction sample also showed good photocatalytic performance for rhodamine B degradation. This study may provide some insights into rational design of new types of gas sensors and offer an alternative for noninvasive diagnosis of diabetes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20794991
Volume :
10
Issue :
2
Database :
Academic Search Index
Journal :
Nanomaterials (2079-4991)
Publication Type :
Academic Journal
Accession number :
142069170
Full Text :
https://doi.org/10.3390/nano10020398