Heterostructures of mesoporous hollow Zn2SnO4/SnO2 microboxes for high-performance acetone sensors

Metal oxide Semiconductors with porous hollow heterostructures can provide significant advantages for gas sensing by facilitating the increase of free electron density and the diffusion of target gases. Herein, mesoporous hollow Zn2SnO4/SnO2 microboxes were successfully synthesized by using a facile...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-12, Vol.844, p.155788, Article 155788
Main Authors: Lu, Jie, Xie, Yanmei, Luo, Fuli, Fu, Hao, Huang, Xiang, Liu, Yuchang, Liu, Hongjie
Format: Article
Language:English
Subjects:
Acetone
Electron density
Free electrons
Gas sensors
Heterojunction
Heterojunctions
Heterostructures
Mesoporous hollow structure
Metal oxide semiconductors
Operating temperature
Selectivity
Sensor
Sensors
Tin dioxide
Zinc stannate
Zn2SnO4/SnO2
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Summary:Metal oxide Semiconductors with porous hollow heterostructures can provide significant advantages for gas sensing by facilitating the increase of free electron density and the diffusion of target gases. Herein, mesoporous hollow Zn2SnO4/SnO2 microboxes were successfully synthesized by using a facile ZnSn(OH)6-sacrificial template method. In synergy with the special mesoporous hollow structure and the n-n heterojunction formed between Zn2SnO4 and SnO2, the Zn2SnO4/SnO2 composites exhibited excellent acetone-sensing properties. Compared with the pure SnO2 sensor, the Zn2SnO4/SnO2 sensor not only displayed a 2 times higher response (20.1) toward 100 ppm acetone as well as excellent selectivity and stability at the optimal operating temperature of 250 °C, but still maintained a perceived response (2.4) even when the concentration of acetone was down to 1 ppm. In addition, the enhanced sensing mechanism of Zn2SnO4/SnO2 microboxes was also discussed in detail. This work indicates that the mesoporous hollow Zn2SnO4/SnO2 microboxes can be very promising sensing material for the application of acetone gas sensors. [Display omitted] •N-n type mesoporous hollow Zn2SnO4/SnO2 microboxes were synthesized by using the self-templating sacrifice method.•The Zn2SnO4/SnO2 sensor displayed high sensitivity and selectivity toward 100 ppm acetone at 250 °C.•The improved sensing properties can be attributed to the heterojunction and the unique “mesoporous hollow structure”.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.155788