Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide

Kovács, Teodóra and Lukács, István Endre and Szabó, Anna and Hernádi, Klára and Igricz, Tamás and László, Krisztina and Szilágyi, Imre M. and Pokol, György (2020) Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide. JOURNAL OF SOLID STATE CHEMISTRY, 281. pp. 1-7. ISSN 0022-4596

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This paper presents the preparation of monoclinic WO3 by a one-step hydrothermal method. The effect of very acidic pH (0.1) and the significance of various additives (CH3COOH, NaClO4, Na2SO4) were investigated. To clarify the role of pH on the obtained crystal structure and morphology, every synthesis using pH 1 were repeated, and the effect of temperature, using 180 and 200 °C, was also studied. All samples prepared at pH 0.1 were pure, well crystallized monoclinic WO3 independently from the temperature, the presence and the quality of the additives. At 180 and 200 °C, applying CH3COOH and NaClO4 resulted nanosheets similar in size. With Na2SO4 additive at 180 °C sheets, at 200 °C sheets and also rods formed indicating that SO4 2− was a capping agent only at 200 °C. For comparison, at pH 1 at both temperatures the crystalline phases and the morphologies varied depending on the type of the additive. © 2019 The Authors

Item Type: Article
Additional Information: Első szerző: Nagyné-Kovács Teodóra
Subjects: T Technology / alkalmazott, műszaki tudományok > TP Chemical technology / vegyipar, vegyészeti technológia
Depositing User: MTMT SWORD
Date Deposited: 27 Jan 2020 14:17
Last Modified: 27 Jan 2020 14:17

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