Study on Tungsten Oxide (WO3) Nanostructures Formation via Seeded Growth Hydrothermal Reaction

Rabizah Makhsin Siti; Abdul Razak Khairunisak; Zainovia Lockman

doi:10.4028/www.scientific.net/AMM.83.204

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 83Study on Tungsten Oxide (WO3) Nanostructures...

Study on Tungsten Oxide (WO₃) Nanostructures Formation via Seeded Growth Hydrothermal Reaction

Abstract:

This work describes the formation of WO₃ nanostructures via seeded growth hydrothermal reaction. WO₃ seed formation was first studied using thermal oxidation of W substrate from 300-500°C for 30 minutes. The optimum seeded substrates were then subjected to hydrothermal reaction at 80°C by varying precursor concentration and pH of the solution. Optimum oxidation temperature to produce WO₃ seeds was at 400°C for 30 minutes. Below 400°C, no seed was formed while above that temperature the seeds became too compact and less uniform. The optimum hydrothermal reaction parameters were obtained after 24 hrs reaction time, concentration ratio of sodium tungstate dehydrate to cetyltrimethylammonium bromide (CTAB) of 6:1 and at pH 2. By lowering the pH and increasing the precursor concentration, the growth of WO₃ nanostructures was enhanced. X-ray diffraction analysis showed that WO₃ nanostructures formed were of hexagonal structure.

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Applied Mechanics and Materials (Volume 83)

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204-209

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https://doi.org/10.4028/www.scientific.net/AMM.83.204

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July 2011

Authors:

Rabizah Makhsin Siti, Abdul Razak Khairunisak, Zainovia Lockman

Keywords:

Hydrothermal, Nanostructure, Seeded-Growth, Tungsten Oxide

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