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Effect of Different Anions Upon the WO3 Morphology and Structure

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In this study the effects of various anions (SO2− 4, ClO 4 and PO3− 4) were investigated on the hydrothermal treatment of WO3 from Na2WO4 and HCl at 180 and 200 °C. The products were analyzed by XRD and SEM. With the usage of SO2− 4 the obtained product was hexagonal (h-) WO3 in the form of nanorods at both temperatures. Applying ClO 4 resulted in a mixture of WO3·0.33H2O and small amount of m-WO3 at 180 °C and pure WO3·0.33H2O at 200 °C. The morphology was consisted of cuboid shapes arranged into spherical structures at 180 °C and longitudinal ones at 200 °C. By the application of PO3− 4 no product formed at either temperature. Using the combination of SO2− 4, and ClO 4 the product was h-WO3 at both 180 and 200 °C with rod-like crystals; thus, the effect of ClO 4 was overdominated by the SO2− 4ions. Utilization of PO3− 4 together with SO2− 4, and/or ClO 4 resulted again in no product, meaning that adding PO3− 4 to the reaction mixture completely blocks the hydrothermal formation of solid products by forming water soluble phosphotungstic acids.
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Keywords: ClO−4; Hydrothermal Treatment; Morphology; PO3−4; SO2−4; Structure; Tungtsen Oxides

Document Type: Research Article

Affiliations: 1: Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műuegyetem Rakpart 3, Budapest, H-1111, Hungary 2: Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, H-1121, Hungary

Publication date: January 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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