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Segmented nanoporous WO3 prepared via anodization and their photocatalytic properties

Published online by Cambridge University Press:  11 March 2016

Syahriza Ismail ,
Chai Yan Ng ,
Ehsan Ahmadi ,
Khairunisak Abdul Razak  and
Zainovia Lockman
Syahriza Ismail
Affiliation:
Green Electronics Nanomaterials Group, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia; and Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka,76100 Durian Tunggal, Melaka, Malaysia
Chai Yan Ng
Affiliation:
Green Electronics Nanomaterials Group, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia; and Department of Mechanical and Material Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 43000 Kajang, Selangor, Malaysia
Ehsan Ahmadi
Affiliation:
Green Electronics Nanomaterials Group, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia
Khairunisak Abdul Razak
Affiliation:
Green Electronics Nanomaterials Group, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia
Zainovia Lockman*
Affiliation:
Green Electronics Nanomaterials Group, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia
*
a)Address all correspondence to this author. e-mail: zainovia@usm.my
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Abstract

Segmented nanoporous WO3 is prepared via anodization with an electrolyte containing 1 M Na2SO4 and 0.07–0.7 g of NH4F. Annealing (500 °C for 1 h) was also performed to induce crystallinity in WO3. More pores (50–80 nm in diameter) and thicker porous layer were formed by increasing the amount of NH4F (400 nm for 0.3 g of NH4F). However, further increase of the NH4F amount to 0.5 and 0.7 g did not increase the porous layer thickness. Segmented nanoporous structure formation was attributed to the dissolution of anodic oxide by H+ and F− ions in the electrolyte, as well as the healing process induced by the electric field. The photocatalytic activity of the WO3 samples was evaluated through degradation of methyl orange solution. The as-anodized sample showed lower photocatalytic ability in comparison with the annealed sample because of the amorphous behavior of as-anodized WO3.

Keywords

nanostructureoxidationoxide
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 6 , 28 March 2016 , pp. 721 - 728
Copyright
Copyright © Materials Research Society 2016 

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