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

• Published in: Journal of materials science. Materials in electronics Vol. 31; no. 15; pp. 12783 - 12795
• Main Authors: Nguyen, Hong T. T., Truong, Thi Hien, Nguyen, Tien Dai, Dang, Van Thai, Vu, Tuan V., Nguyen, Son Tung, Cu, Xuan Phong, Nguyen, Thi Tu Oanh
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2020; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemical properties; Chemical synthesis; Chemistry and Materials Science; Electron microscopy; Flakes (defects); Hydrogen sulfide; Materials Science; Microscopy; Nickel; Operating temperature; Optical and Electronic Materials; Photoelectrons; Photoluminescence; Raman spectroscopy; Selectivity; Sensors; Spectrum analysis; Surface defects; Tungsten oxides; X ray photoelectron spectroscopy
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03830-9

In this work, we report on the synthesis of Ni-doped WO 3 flakes by the hydrothermal method. The physical and chemical properties of the synthesized Ni-doped WO 3 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 N 2 adsorption–desorption measurement, thereby confirming the effect of Ni doping on H 2 S-sensing properties. The sensitivity to H 2 S gas of Ni-doped WO 3 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 Ni 2+ ions in the structure of WO 3 flakes, the Ni-doped WO 3 sensor exhibited a better sensing of H 2 S gas than the pristine WO 3 sensor. This result indicates that the Ni-doped WO 3 flake structure is promising for detecting H 2 S gas as a selective, inexpensive, and outstanding sensor materials.