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Nanostructured WO3films using high temperature anodization

Authors
Journal
Sensors and Actuators B Chemical
0925-4005
Publisher
Elsevier
Publication Date
Volume
142
Issue
1
Identifiers
DOI: 10.1016/j.snb.2009.08.014
Keywords
  • Wo3
  • Nanostructured
  • High Temperature Bathing
  • High Temperature Anodization
  • Orthorhombic

Abstract

Abstract We have investigated the formation of highly porous nanostructured tungsten trioxide (WO 3) films of several microns thickness using elevated temperature anodization in nitric acid. Plate-like crystals with thicknesses in the range of 20–60 nm and lengths in the order of 50–1000 nm were obtained after anodization of tungsten foil in 1.5 M HNO 3 at 50 °C. High intensity {2 0 0} WO 3 crystallographic signatures from platelets revealed the presence of predominantly orthorhombic WO 3 nanoplatelets in annealed (up to 550 °C) samples. Photocurrent measurements revealed that 4 h anodized sample at 20 V produced the largest photocurrent density. High photocurrent response from the nanoplateleted films show the possibility of developing efficient WO 3/electrolyte sandwiched photosensors.

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