Formation of nano-rod sodium tungstate film by sodium ion diffusion

Tungsten oxide (WO 3) and nano-rod sodium tungstate (Na 2W 2O 7) thin film was prepared by dip coating on slide glass (SG) and tin-doped indium oxide (ITO) coated glass in peroxotungstic acid (PTA) solution. Thermal analysis results showed that PTA is decomposed to tungsten oxide via multiple steps...

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Bibliographic Details
Published in:Materials chemistry and physics 2009-08, Vol.116 (2), p.527-531
Main Authors: Kim, Chang-Yeoul, Huh, Seung-Hun, Riu, Doh-Hyung
Format: Article
Language:English
Subjects:
Ion diffusion
Nanorod
Raman
Sodium tungstate
Tungsten oxide
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Summary:Tungsten oxide (WO 3) and nano-rod sodium tungstate (Na 2W 2O 7) thin film was prepared by dip coating on slide glass (SG) and tin-doped indium oxide (ITO) coated glass in peroxotungstic acid (PTA) solution. Thermal analysis results showed that PTA is decomposed to tungsten oxide via multiple steps of WO 3·2/3H 2O, WO 3·1/3H 2O and WO 3. Monoclinic phase appeared on ITO glass at 400 °C and crystal growth occurred at 500 °C. However, quite different crystallization behavior appeared on SG due to sodium ion diffusion. At 400 °C, rectangular shape crystals identified as Na 2W 4O 13 appeared in amorphous matrix, and grew to bundles of rod-shaped Na 2W 2O 7 and Na 2W 4O 13 phase at 500 °C. Raman scattering spectroscopy data confirmed the formation of Na 2W 4O 13 and Na 2W 2O 7 at 500 °C. The understanding of crystallization behavior and sodium ion diffusion into WO 3 thin film on different substrates may be helpful to the application area of electrochromic windows or photocatalyst.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2009.04.045