Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide

Teodóra Nagyné-Kovács, István Endre Lukács, Anna Szabó, Klara Hernadi, Tamás Igricz, Krisztina László, Imre M. Szilágyi, György Pokol

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number121044
JournalJournal of Solid State Chemistry
Volume281
DOIs
Publication statusPublished - Jan 2020

Fingerprint

Tungsten Compounds
Chlorine Compounds
Tungsten compounds
tungsten compounds
chlorine compounds
pH effects
Sodium sulfate
tungsten oxides
Chlorine compounds
sodium sulfates
Tungsten
Energy gap
Crystal structure
preparation
crystal structure
Oxides
Nanosheets
crystal morphology
Temperature
temperature

Keywords

  • Band gap
  • Hydrothermal
  • Monoclinic WO
  • Morphology
  • pH

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide. / Nagyné-Kovács, Teodóra; Lukács, István Endre; Szabó, Anna; Hernadi, Klara; Igricz, Tamás; László, Krisztina; Szilágyi, Imre M.; Pokol, György.

In: Journal of Solid State Chemistry, Vol. 281, 121044, 01.2020.

Research output: Contribution to journalArticle

Nagyné-Kovács, Teodóra ; Lukács, István Endre ; Szabó, Anna ; Hernadi, Klara ; Igricz, Tamás ; László, Krisztina ; Szilágyi, Imre M. ; Pokol, György. / Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide. In: Journal of Solid State Chemistry. 2020 ; Vol. 281.
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