Annealing induced structural evolution and electrochromic properties of nanostructured tungsten oxide films

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effect of microstructure on the optical and electrochemical properties of nanostructured tungsten oxide films was evaluated as a function of annealing temperature. The films using block copolymer as the template were prepared from peroxotungstic acid (PTA) by spin-coating onto the substrate and post-annealed at 250-400 C to form tungsten oxide films with nanostructure. The microstructure of the films was measured by X-ray diffraction and surface electron microscopy. The films annealed at temperatures below 300 C are characterized by amorphous or nanocrystalline structures with a pore size of less than 10 nm. The evaluated annealing temperature caused a triclinic crystalline structure and microcracks. Cyclic voltammetry measurements were performed in a LiClO4-propylene carbonate electrolyte. The results showed that the ion inserted capacity were maximized for films annealed at 300 C and decreased with the increasing of annealing temperature. The electrochromic properties of the nanostructured tungsten oxide films were evaluated simultaneously by potentiostat and UV-vis spectroscopy. The films annealed at 300 C exhibit high transmission modulation (â̂†T ~ 40%) at λ = 633 nm and good kinetic properties. As a result, the correlation between the microstructure and kinetic properties was established, and the electrochromic properties have been demonstrated.

Original languageEnglish
Pages (from-to)258-262
Number of pages5
JournalThin Solid Films
Volume549
DOIs
Publication statusPublished - 2013 Dec 31

Fingerprint

tungsten oxides
Oxide films
Tungsten
oxide films
Annealing
annealing
microstructure
Microstructure
nanostructure (characteristics)
Temperature
Kinetics
temperature
microcracks
kinetics
Spin coating
Microcracks
block copolymers
Ultraviolet spectroscopy
propylene
Electrochemical properties

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Wu, Ching Lin ; Lin, Chung Kwei ; Wang, Chun Kai ; Wang, Sheng Chang ; Huang, Jow-Lay. / Annealing induced structural evolution and electrochromic properties of nanostructured tungsten oxide films. In: Thin Solid Films. 2013 ; Vol. 549. pp. 258-262.
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Annealing induced structural evolution and electrochromic properties of nanostructured tungsten oxide films. / Wu, Ching Lin; Lin, Chung Kwei; Wang, Chun Kai; Wang, Sheng Chang; Huang, Jow-Lay.

In: Thin Solid Films, Vol. 549, 31.12.2013, p. 258-262.

Research output: Contribution to journalArticle

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