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Sensitivity of nanocrystalline orthorhombic and hexagonal MoO3 to ammonia in relation to surface acidityстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 января 2026 г.
- Авторы: Marikutsa Artem, Murodova Shohpari, Rumyantseva Marina
- Журнал: Sensors and Actuators, B: Chemical
- Том: 448
- Год издания: 2026
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 139067
- DOI: 10.1016/j.snb.2025.139067
- Аннотация: Molybdenum trioxide is an n-type semiconductor sensitive to noxious gases. Sensing nanomaterials based on MoO3 with different morphologies and additives were proposed to improve the selectivity to analyzed gases, but most of research was focused on the orthorhombic phase α-MoO3. Distinct gas sensing behavior of other polymorphs steel needs to be rationalized. In this work, we performed a comparative study of surface acidity and gas sensitivity of nanocrystalline α-MoO3 and hexagonal h-MoO3 prepared by sol-gel and hydrothermal routes. The materials showed similar oxidizing activity probed by H2 temperature programmed reduction. However, h-MoO3 possessed a higher concentration of acid surface sites evaluated by NH3 temperature programmed desorption. Sensing tests to inorganic toxic gases the demonstrated higher sensitivity of h-MoO3 to ammonia and inferior sensitivity to H2S and NO2, in comparison to α-MoO3. It correlates with the distinct surface acidity of materials which favors adsorption of Lewis base NH3 at the surface of h-MoO3. By in situ diffuse-reflectance infrared spectroscopy the role of Lewis acid sites and surface oxygen species of h-MoO3 in process of ammonia adsorption and oxidation was evidenced.
- Добавил в систему: Марикуца Артем Валерьевич
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