期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 273, 期 -, 页码 25-31出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2019.02.023
关键词
WO3; In2O3; Sol-gel; Semiconductor gas-sensors; CO; NO2
资金
- Republic of Belarus research program Energetic systems, processes and technologies, task 2.80
- Ministry of Science and Higher Education of the Russian Federation [K2-2019-007]
Pure semiconductor tungsten oxide (WO3), indium oxide (In2O3) and mixed nanocomposites with different WO3 to In2O3 ratios were successfully synthesized by simple sol-gel method following calcination at 600 degrees C. The morphology, phase composition and features of crustal structure of the materials were studied by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transition electron microscopy and electron paramagnetic resonance spectroscopy. It was found that the nanocomposite materials are characterized by fine crystallinity of 8-38 nm, highly defective crystal cells and presence of delocalized electrons in their structures, which can significantly affect gas sensitivity. The gas sensors based on WO3-In2O3 composite structures exhibited excellent CO and NO2 detecting performance at optimal operating temperature of similar to 240 degrees C and similar to 140 degrees C, respectively.
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