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Non-stoichiometric nanocrystalline cobalt gallate with a spinel structure as fine-tunable gas sensitive materialстатья
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: 1 апреля 2026 г.
- Авторы: Sagitova Alina, Bogdanova Alexandra, Sinichkina Daria, Boltkov Evgeny, Dvoryak Stanislav, Maksimov Sergey, Krivetskiy Valeriy
- Журнал: Materials Chemistry and Physics
- Том: 358
- Год издания: 2026
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 132399
- DOI: 10.1016/j.matchemphys.2026.132399
- Аннотация: The growing interest towards machine olfaction devices with gas sensor arrays as sensitive elements dictates the need in the search of new gas sensing semiconductor metal oxides. The paper represents a systematic research of gas sensor properties of semiconductor cobalt gallate in relation to the chemical composition, structural features and morphology. Nanocrystalline cobalt gallate samples with variable molar ratio in precursors [Co]/[Ga] = 0.5, 0.33, 0.25, 0.125 and 0.083 were synthesized by flame spray pyrolysis technique and characterized by XRD, BET, TEM-EDX, XPS and Raman spectroscopy methods. The [Со]/[Ga] molar ratio of 0.125 corresponds to the minimum value required to form a solid solution with spinel structure. With an increase in the amount of Ga3+ in non-stoichiometric samples, the concentration of Co3+ and the degree of spinel inversion decreases. Also, the deviation from the stoichiometric composition in the materials leads to the increase in their gas sensitivity, especially to carbonylic volatile organic compounds. The optimal [Co]/[Ga] molar ratio for improved sensor performance is between 0.25 and 0.33. Due to the pronounced dependence of the sensor performance on the [Co]/[Ga] molar ratio, non-stoichiometric cobalt gallate samples are fine-tunable materials for semiconductor gas sensors.
- Добавил в систему: Сагитова Алина Салаватовна
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