Effect of Different Anions Upon the WO3 Morphology and Structure

Kovács, Teodóra and Malik, Adrienn and Szenkovits, Arshak and Lukács, István Endre and Szilágyi, Imre M. and Pokol, György (2019) Effect of Different Anions Upon the WO3 Morphology and Structure. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 19 (1). pp. 498-501. ISSN 1533-4880


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In this study the effects of various anions (SO42-, ClO4- and PO43-) were investigated on the hydrothermal treatment of WO3 from Na2WO4 and HCl at 180 and 200 degrees C. The products were analyzed by XRD and SEM. With the usage of SO42- the obtained product was hexagonal (h-) WO3 in the form of nanorods at both temperatures. Applying ClO4- resulted in a mixture of WO3 center dot 0.33H(2)O and small amount of m-WO3 at 180 degrees C and pure WO3 center dot 0.33H(2)O at 200 degrees C. The morphology was consisted of cuboid shapes arranged into spherical structures at 180 degrees C and longitudinal ones at 200 degrees C. By the application of PO43- no product formed at either temperature. Using the combination of SO42-, and ClO4- the product was h-WO3 at both 180 and 200 degrees C with rod-like crystals; thus, the effect of ClO4- was overdominated by the SO42- ions. Utilization of PO43- together with SO42-, and/or ClO4- resulted again in no product, meaning that adding PO43- to the reaction mixture completely blocks the hydrothermal formation of solid products by forming water soluble phosphotungstic acids.

Item Type: Article
Uncontrolled Keywords: MORPHOLOGY; structure; Hydrothermal treatment; Tungtsen Oxides; SO42-; ClO4-; PO43-;
Subjects: Q Science / természettudomány > QD Chemistry / kémia > QD04 Organic chemistry / szerves kémia
Depositing User: MTMT SWORD
Date Deposited: 25 Feb 2019 13:27
Last Modified: 01 Jan 2020 00:17

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