Синтез и сенсорные свойства наноматериалов на основе оксида вольфрама (VI)
DOI:
https://doi.org/10.17308/kcmf.2024.26/11946Ключевые слова:
металлоксидные сенсоры, чувствительность, температурная модуляцияАннотация
Целью работы явилась разработка методики синтеза наномерных материалов на основе WO3, их характеризация и исследование сенсорных свойств.
Нанопорошок был изготовлен при медленном добавлении азотной кислоты к водному раствору паравольфрамата аммония (NH4)10W21O41·xH2O с последующим центрифугированием, высушиванием и прокаливанием. Методом просвечивающей электронной микроскопии установлен размер зерен триоксида вольфрама, который составил 10-20 нм. По данным рентгеновского фазового анализа порошок, прокаленный при температуре 500 °С, состоит преимущественно из триклинной фазы. В дальнейшем к нанопорошку WO3 был добавлены нитрат диамминпалладия (II) и терпениол для образования пасты. Полученная паста была нанесена на специальную диэлектрическую подложку и прокалена до температуры 750 °С, в результате чего был получен хрупкий гель на основе триоксида
вольфрама. Массовая доля палладия в хрупком геле составила 3 %. Сенсорные свойства полученного газочувствительного материала были исследованы при стационарном (300 °С) и нестационарном температурном режиме работы сенсора (быстрый нагрев до 450 °С и медленное охлаждение до 100 °С).
Показано резкое увеличение чувствительности сенсора на основе триоксида вольфрама при использовании нестационарного температурного режима в зависимости от состава газочувствительного слоя
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