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Ni-doped WO3 flakes-based sensor for fast and selective detection of H2S


Hong T. T. Nguyen, Thi Hien Truong, Tien Dai Nguyen, Van Thai Dang, Tuan V. Vu, Son Tung Nguyen, Xuan Phong Cu, Thi Tu Oanh Nguyen

Source title: 
Journal of Materials Science: Materials in Electronics, 31(15): 12783-12795, 2020 (ISI)
Academic year of acceptance: 

In this work, we report on the synthesis of Ni-doped WO3 flakes by the hydrothermal method. The physical and chemical properties of the synthesized Ni-doped WO3 flakes were thoroughly investigated by scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, Raman spectroscopy, photoluminescence spectrum, X-ray diffraction, X-ray photoelectron spectroscopy, and N2 adsorption–desorption measurement, thereby confirming the effect of Ni doping on H2S-sensing properties. The sensitivity to H2S gas of Ni-doped WO3 flakes showed short response/recovery times of 17 s/110 s, high stability, good selectivity, and low operating temperature of 250 °C. Due to the increasing surface defects and oxygen vacancies with the presence of Ni2+ ions in the structure of WO3 flakes, the Ni-doped WO3 sensor exhibited a better sensing of H2S gas than the pristine WO3 sensor. This result indicates that the Ni-doped WO3 flake structure is promising for detecting H2S gas as a selective, inexpensive, and outstanding sensor materials.