UV activated hollow ZnO microspheres for selective ethanol sensors at low temperatures

UV activated metal oxides for chemiresistive-type gas sensors have been recently studied aiming to lower the working temperature and thus lower the power consumption. In this work, the mesoporous hollow ZnO microspheres were prepared by template-assisted method and examined for VOCs detection with U...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Vol. 232; pp. 158 - 164
Main Authors: Chen, Yi, Li, Xiaogan, Li, Xiaoxin, Wang, Jing, Tang, Zhenan
Format: Journal Article
Language:English
Published: Elsevier B.V 01.09.2016
Subjects:
Activated
Ethanol
Ethyl alcohol
Gas sensors
Hollow ZnO microspheres
Illumination
Low-temperature gas sensors
Microspheres
Sensors
UV illumination
Zinc oxide
Low-temperature gas sensors
Hollow ZnO microspheres
Ethanol
UV illumination
ISSN:0925-4005, 1873-3077
Online Access:Get full text
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Summary:UV activated metal oxides for chemiresistive-type gas sensors have been recently studied aiming to lower the working temperature and thus lower the power consumption. In this work, the mesoporous hollow ZnO microspheres were prepared by template-assisted method and examined for VOCs detection with UV LED illumination at lower temperatures than 150°C. The as-synthesized ZnO based sensor indicated an excellent response and selectivity to different concentrations of ethanol (10–1000ppm) with low-powered UV LED (2mW) at 80°C. The response time is only ∼6s while the recovery is a little sluggish (∼94s). The enhanced sensing performance could be attributed to the mesoporous hollow microstructure of the synthesized ZnO and UV activated differential photoctalytic oxidation reactions at the shallow oxide surface regions. The repeatability and long term stability of the sensor and the sensor response were also investigated. A comparison with the conventional thermal-activated gas sensing of the hollow ZnO was also conducted and the photo-activated gas sensing mechanism was discussed.
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ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.03.138