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During gas sensors development the selection of an appropriate gas-sensing material is essential. Currently, the development of new gas-sensitive layers based on molybdenum oxide MoO3 and the improvement of their sensor characteristics are of great interest. In this work, a gas-sensitive layer of MoO3 was obtained by hydrothermal method followed by annealing at 400 °C for 2 hours. The surface elemental composition of the produced sample was analyzed by X-ray photoelectron spectroscopy. The sensor response, response and recovery times of the gas-sensitive layer were studied to isopropyl alcohol vapors at different working temperatures. It was shown that chemical composition corresponds to MoO3, but adsorbed hydroxyl groups are also observed on the surface. The analysis of sensor properties showed that the sensitivity at 250 and 150 °C is 13.3 and 5.5 respectively. It has been established that the layers synthesized by the hydrothermal method based on MoO3 demonstrate sensibility to isopropyl alcohol vapors even at 150 °C.
Svetlana S. Nalimova
Saint Petersburg Electrotechnical University (Russia, 197376, St. Petersburg, Professor Popov st., 5)
Zamir V. Shomakhov
Kabardino-Balkarian State University named after H. M. Berbekov (Russia, 360004, Kabardino-Balkarian Republic, Nalchik, Chernyshevsky st., 173)
Vyacheslav A. Moshnikov
Saint Petersburg Electrotechnical University (Russia, 197376, St. Petersburg, Professor Popov st., 5)

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