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Improved triethylamine sensing properties by designing an In2O3/ZnO heterojunction
- Source :
- Sensors and Actuators Reports, Vol 3, Iss , Pp 100064- (2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier, 2021.
-
Abstract
- Sensors of volatile organic compounds (VOCs) play a vital role in environmental monitoring. Although much progress has been made to develop new sensing materials, it remains challenging to detect a particular VOC selectively and without the interference of humidity. Herein, we report the effect of In2O3 nanoparticles on the VOC-sensing performance of ZnO twin-rods. The VOC-sensing tests were carried out in dry air and at a relative humidity (RH) of 26, 59, and 98%. The results indicated that the In2O3/ZnO heterostructure exhibited an improved sensing performance to triethylamine (TEA) compared to ZnO. In dry air, the responses to 100 ppm of TEA at 350 °C were 60.2 for the In2O3/ZnO heterostructure and 39.2 for pure ZnO. In2O3/ZnO even exhibited a high response of 6.2 to 1 ppm of TEA. Moreover, In2O3/ZnO exhibited a response to TEA up to 46.2 times higher than those of the other VOCs, indicating excellent selectivity. At 98% RH, the In2O3/ZnO heterostructure still had a high sensitivity to TEA, showing a response of 21.2 to 100 ppm of TEA with a response time of 1 s. The improved TEA-sensing performance of the In2O3/ZnO heterostructure can be attributed to the formation of the n-n heterojunction.
Details
- Language :
- English
- ISSN :
- 26660539
- Volume :
- 3
- Issue :
- 100064-
- Database :
- Directory of Open Access Journals
- Journal :
- Sensors and Actuators Reports
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.475a39ddca04528915cae96d659c57a
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.snr.2021.100064