Comparative study on CO2 and CO sensing performance of LaOCl-coated ZnO nanowires

► High performance CO2 and CO gas sensors were prepared via a simple route. ► CO2 and CO gas-sensing performance of LaOCl-coated ZnO nanowires were compared. ► The coating LaOCl enhanced response to both CO2 as well as CO gases. ► The LaOCl-coating sensors had short response–recovery time to CO2, bu...

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Bibliographic Details
Published in:Journal of hazardous materials 2013-01, Vol.244-245, p.209-216
Main Authors: Van Hieu, Nguyen, Khoang, Nguyen Duc, Trung, Do Dang, Toan, Le Duc, Van Duy, Nguyen, Hoa, Nguyen Duc
Format: Article
Language:English
Subjects:
Air Pollutants - analysis
Air Pollutants - chemistry
Carbon Dioxide - analysis
Carbon Dioxide - chemistry
Carbon Monoxide - analysis
Carbon Monoxide - chemistry
Environmental Monitoring - methods
Functionalization
Gas sensor
Lanthanum - chemistry
LaOCl
Microscopy, Electron, Scanning
Nanowires - chemistry
Nanowires - ultrastructure
Zinc Oxide - chemistry
ZnO nanowires
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Summary:► High performance CO2 and CO gas sensors were prepared via a simple route. ► CO2 and CO gas-sensing performance of LaOCl-coated ZnO nanowires were compared. ► The coating LaOCl enhanced response to both CO2 as well as CO gases. ► The LaOCl-coating sensors had short response–recovery time to CO2, but not to CO. Carbon dioxide (CO2) and carbon monoxide (CO) emissions from industries and combustion fuels such as coal, oil, hydrocarbon, and natural gases are increasing, thus causing environmental pollution and climate change. The selective detection of CO2 and CO gases is important for environmental monitoring and industrial safety applications. In this work, LaOCl-coated ZnO nanowires (NWs) sensors are fabricated and characterized for the detection of CO2 (250–4000ppm) and CO (10–200ppm) gases at different operating temperatures. The effects of the LaCl3 coating concentration and calcination temperature of the sensors are studied. They are found to have a strong influence on the sensing performance to CO2 gas, but a relatively slight influence on that to CO. The LaOCl coating enhances the response and shortens the response and recovery times to CO2 compared with those to CO. The enhanced response of the LaOCl-coated ZnO NW sensors is attributed to the extension of the electron depletion layer due to the formation of p-LaOCl/n-ZnO junctions on the surfaces of the ZnO NWs.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2012.11.023