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Iron oxide nanorods were synthesized by chemical co-precipitation method. The structural and morphological characteristics of the as-synthesized nanorods were analyzed by Xray diffraction (XRD) and scanning electron microscopy. The results show that the iron oxide nanorods include the mixture of Fe3O4, γ-Fe2O3 and FeOOH with the diameter and the length of iron oxide nanorods to be 30 and 100 nm, respectively. The iron oxide nanorods were then dispersed and deposited on the gold electrode of quartz crystal microbalance (QCM) for the gas sensor. The iron oxide nanorods based QCM sensor was tested with various concentrations of numerous toxic gases at room temperature, including nitrogen dioxide (NO2), sulfur dioxide (SO2), ammonia (NH3), and carbon monoxide (CO). The testing results indicate that the fabricated sensor exhibits high sensing performance to NO2 gas in the concentration range from 5 to 20 ppm. | Vietnam Journal of Science and Technology 58 2 2020 204-211 doi 10.15625 2525-2518 58 2 14225 cros Powered by no2 gas sensor based on qcm coated with IRON OXIDE NANORODS Nguyen Thanh Vinh1 2 Vu Ngoc Phan3 Man Hoai Nam4 Le Anh Tuan5 Nguyen Van Quy1 international Training Institute for Materials Science Hanoi University of Science and Technology No. 1 Dai Co Viet Road Hai Ba Trung District Ha Noi Viet Nam 2University of Transport Technology 54 Trieu Khuc Thanh Xuan District Ha Noi Viet Nam 3Faculty of Biotechnology Chemistry and Environmental Phenikaa University Ha Noi Viet Nam 4Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Cau Giay Ha Noi Viet Nam 5Phenikaa University Nano Institute Phenikaa University Ha Dong Ha Noi Viet Nam Email quy@itims.edu.vn quy.nguyenvan@hust.edu.vn Received 16 August 2019 Accepted for publication 27 October 2019 Abstract. Iron oxide nanorods were synthesized by chemical co-precipitation method. The structural and morphological characteristics of the as-synthesized nanorods were analyzed by X-ray diffraction XRD and scanning electron microscopy. The results show that the iron oxide nanorods include the mixture of Fe3O4 Y-Fe2O3 and FeOOH with the diameter and the length of iron oxide nanorods to be 30 and 100 nm respectively. The iron oxide nanorods were then dispersed and deposited on the gold electrode of quartz crystal microbalance QCM for the gas sensor. The iron oxide nanorods based QCM sensor was tested with various concentrations of numerous toxic gases at room temperature including nitrogen dioxide NO2 sulfur dioxide SO2 ammonia NH3 and carbon monoxide CO . The testing results indicate that the fabricated sensor exhibits high sensing performance to NO2 gas in the concentration range from 5 to 20 ppm. Keywords QCM NO2 gas sensor iron oxide nanorods. Classification numbers 2.4.2 2.5.3 3.2.3. 1. INTRODUCTION Nowadays rapid and continuous development of industries .
