Electrochromic and optical properties of mesoporous tungsten oxide films

Esra Ozkan, Se Hee Lee, Ping Liu*, C. Edwin Tracy, Fatma Z. Tepehan, J. Roland Pitts, Satyen K. Deb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

136 Citations (Scopus)

Abstract

Standard and mesoporous sol-gel tungsten oxide thin films were prepared by a spin-coating technique from an ethanolic solution of tungsten hexachloride. A block copolymer (BASF™ Pluronic p123) was employed as a template to generate the mesoporous structure. An ultraviolet (UV) illumination method was employed to remove the polymer templates at room temperature. The electrochromic and optical properties of the mesoporous films are described and compared to standard sol-gel tungsten oxide films. Results are also presented on the samples prepared by thermal treatment. We demonstrate that the UV illumination/ozone treatment is a superior method to remove templates which enables us to more effectively investigate the effect of mesoporosity on the electrokinetics of ion insertion into tungsten oxide films.

Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalSolid State Ionics
Volume149
Issue number1-2
DOIs
Publication statusPublished - Jul 2002

Funding

This work has been supported by the Director's Discretionary Research and Development Program (DDRD) at the National Renewable Energy Laboratory, which is funded by US Department of Energy, under contract no. DE-AC-36-99GO10337. The authors thank Dr. Yanfa Yan for collecting TEM images and Dr. Helio Moutinho for performing AFM measurements.

FundersFunder number
Director's Discretionary Research and Development Program
US Department of Energy

    Keywords

    • Electrochromism
    • Insertion kinetics
    • Mesoporous tungsten oxide
    • Sol-gel
    • UV illumination

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