Preparation and Properties of Electrochromic λ-MnO2 Thin Film by Dip Coating Method

Keishi NISHIO; Yasutaka SUMIDA; Yuichi WATANABE; Toshio TSUCHIYA

doi:10.2109/jcersj.109.1274_834

Preparation and Properties of Electrochromic λ-MnO₂ Thin Film by Dip Coating Method

Keishi NISHIO, Yasutaka SUMIDA, Yuichi WATANABE, Toshio TSUCHIYA

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Keywords: Manganese oxide, Electrochromic material, Thin film, Dip coating method

JOURNAL FREE ACCESS

2001 Volume 109 Issue 1274 Pages 834-839

DOI https://doi.org/10.2109/jcersj.109.1274_834

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Abstract

A new electrochromic material λ-MnO₂ thin film was prepared from LiMn₂O₄ thin film by acid treatment. LiMn₂O₄ thin film was prepared by dip coating method using manganese acetate tetra-hydrate (Mn(OCOCH₃)₄⋅4H₂O) and lithium acetate di-hydrate (Li(OCOCH₃)⋅2H₂O) as starting materials, and ethanol (C₂H₅OH), ethylene glycol monoethyl ether (C₂H₅OCH₂CH₂OH), 2, 4-pentanedione (CH₃COCH₂COCH₃) and water as solvents. λ-MnO₂ thin film showed electrochromism by application of voltage. The color of thin film changed from reddish brown to transparent.

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