Abstract
Glass crystalline materials from the WO3-ZnO-La2O3-Al2O3 system containing high WO3 concentrations (60–76 mol%) were prepared by controlling the glass crystallization and were then employed as humidity based sensors. According toX-ray analysis, WO3 separates as a crystalline phase from the amorphous structures with the nominal compositions 76WO3·9.5ZnO·9.5La2O3·5Al2O3 and 60WO3·7.5ZnO·7.5La2O3·25Al2O3 after the heat treatment. Samples were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) for elemental analysis. Using the screen printing technique, the synthesized crystalline glass samples were deposited onto interdigidated Pt electrodes; then the sensors were tested in the range from 0.0% to 96% relative humidity (RH) at room temperature. It was observed that the increase in the content of WO3 leads to improve sensor sensitivity towards RH.
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Acknowledgments
The authors greatly acknowledge Professor Jean Marc Tulliani from department of Applied Science and Technology (DISAT), Politecnico di Torino, Turin, Italy, for working in his laboratory facilities for gas sensors testing and for fruitful discussions and Dr. Amr Mohamed, Chemistry Department, Taibah University, Saudi Arabia, for his valuable comments on the manuscript.
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Ataalla, M., Afify, A.S., Hassan, M., Adam, A.M., Milanova, M., Piroeva, I. (2018). Humidity Sensing Properties of Tungsten Based Glass Crystalline Materials in the WO3-ZnO-La2O3-Al2O3 System. In: Petkov, P., Tsiulyanu, D., Popov, C., Kulisch, W. (eds) Advanced Nanotechnologies for Detection and Defence against CBRN Agents. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1298-7_41
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DOI: https://doi.org/10.1007/978-94-024-1298-7_41
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