Title: A comparative study on the NH₃ gas-sensing properties of ZnO, SnO₂, and WO₃ nanowires

Authors: Nguyen Van Hieu, Dang Thi Thanh Le, Nguyen Duc Khoang, Nguyen Van Quy, Nguyen Duc Hoa, Phuong Dinh Tam, Anh-Tuan Le, Tran Trung

Addresses: International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 1 Dai Co Viet, Hanoi, Vietnam. ' International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 1 Dai Co Viet, Hanoi, Vietnam. ' International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 1 Dai Co Viet, Hanoi, Vietnam. ' International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 1 Dai Co Viet, Hanoi, Vietnam. ' International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 1 Dai Co Viet, Hanoi, Vietnam. ' Hanoi Advanced School of Science and Technology (HAST), Hanoi University of Science Technology (HUST), Hanoi, Vietnam. ' Hanoi Advanced School of Science and Technology (HAST), Hanoi University of Science Technology (HUST), Hanoi, Vietnam. ' Faculty of Environment and Chemistry, Hung-Yen University of Technology and Education, Khoai-Chau, Hung-Yen, Vietnam

Abstract: In this work, a large quantity of ZnO, SnO₂ and WO₃ nanowires (NWs) was successfully synthesised by simple and efficient methods. Their morphology and microstructure were characterised by FE-SEM, TEM, XRD, PL, and Raman. The NH₃ gas-sensing properties of these NWs were investigated and compared. It was found that the responses and response-recovery time of SnO₂ and WO₃ NWs sensors to NH₃ gas are relatively comparable, and they have a better NH₃ gas-sensing performance than that of ZnO NWs sensor. In addition, the SnO₂ NWs sensor has the lowest operating temperature.

Keywords: NWs; nanowires; gas sensors; zinc oxide; tin oxide; tungsten oxide; nanotechnology; morphology; microstructure; temperature; sensing performance.

DOI: 10.1504/IJNT.2011.038195

International Journal of Nanotechnology, 2011 Vol.8 No.3/4/5, pp.174 - 187

Published online: 21 Jan 2011 *

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