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Issue 41, 2014
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A simple and low-cost method for the preparation of self-supported TiO2–WO3 ceramic heterojunction wafers

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Abstract

Robust, bilayer heterojunction photodiodes of TiO2–WO3 were prepared successfully by a simple, low-cost powder pressing technique followed by heat-treatment. Exclusive photoirradiation of the TiO2 side of the photodiode resulted in a rapid colour change (dark blue) on the WO3 surface as a result of reduction of W6+ to W5+ (confirmed by X-ray photoelectron spectroscopy). This colour was long lived and shown to be stable in a dry environment in air for several hours. A similar photoirradiation experiment in the presence of a mask showed that charge transfer across the heterojunction occurred approximately normal to the TiO2 surface, with little smearing out of the mask image. As a result of the highly efficient vectorial charge separation, the photodiodes showed a tremendous increase in photocatalytic activity for the degradation of stearic acid, compared to wafers of the respective individual materials when tested separately.

Graphical abstract: A simple and low-cost method for the preparation of self-supported TiO2–WO3 ceramic heterojunction wafers

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Supplementary files

Article information


Submitted
25 Jun 2014
Accepted
10 Sep 2014
First published
10 Sep 2014

J. Mater. Chem. A, 2014,2, 17602-17608
Article type
Paper
Author version available

A simple and low-cost method for the preparation of self-supported TiO2–WO3 ceramic heterojunction wafers

N. M. Makwana, R. Quesada-Cabrera, I. P. Parkin, P. F. McMillan, A. Mills and J. A. Darr, J. Mater. Chem. A, 2014, 2, 17602
DOI: 10.1039/C4TA03257H

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