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

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• 作者：Nguyen Van Hieu ; ^{hieu@itims.edu.vn} ; Nguyen Duc Khoang ; Do Dang Trung ; Le Duc Toan ; Nguyen Van Duy ; Nguyen Duc Hoa
• 关键词：ZnO nanowires ; LaOCl ; Functionalization ; Gas sensor
• 刊名：Journal of Hazardous Materials
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：244-245
• 期：Complete
• 页码：209-216
• 全文大小：1893 K

文摘

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 (250-4000 ppm) and CO (10-200 ppm) 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.