Synthesis and characterization of electrochromic plate-like tungsten oxide films by acidic treatment of electrochemical anodized tungsten

Chun Kai Wang, Chung Kwei Lin, Ching Lin Wu, Sheng Chang Wang, Jow Lay Huang

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Tungsten films on ITO glass were anodized into a porous amorphous WO 3 film morphology at 60 V. The follow-up acidic treatment of the anodized WO3 films in H2SO4 solution transformed the morphology into plate-like WO3·2H 2O. Glancing incident X-ray diffraction and Raman scattering spectra indicated that the growth of plate-like WO3·2H2O films was caused by a dissolution-precipitation reaction in H2SO 4 solution. The plate-like WO3·2H2O transformed into monoclinic WO3 by dehydration at 400 C, and it collapsed into a dense particle-like one at 500 C due to the strain of dehydration. Due to its highly porous plate-like morphology, the 400 C-annealed WO3 film has the highest optical modulation of 52% and coloration efficiency of 71 cm2/C at 633 nm.

Original languageEnglish
Pages (from-to)24-31
Number of pages8
JournalElectrochimica Acta
Volume112
DOIs
Publication statusPublished - 2013

Keywords

  • Acidic treatment
  • Electrochromism
  • Plate-like tungsten oxide films

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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