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WO3 thin film coating from H2O-controlled peroxotungstic acid and its electrochromic properties

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Abstract

We prepared PTA coating solution by hot plate evaporation, N2 bubbling evaporation, and rotary evaporation. N2 bubbling and rotary evaporation are very efficient way to synthesize PTA which reduces the synthesis process time to 1/5, compared to hot plate evaporation method. Another strong point is that N2 bubbling and rotary evaporation make it possible to control excess hydrogen peroxide and water contents in PTA. The PTA formula were WO3·0.13H2O2·10.0H2O for hot plate method, WO3·0.16H2O2·7.1H2O for N2 bubbling method, and WO3·0.15H2O2·3.00H2O for rotary evaporation method. Thermal analysis and mass spectroscopy analysis show that water is evaporated at around 100 °C and hydrogen peroxide is dissociated at the range of 150 and 250 °C. Amorphous phase of WO3 thin film prepared from rotary evaporated PTA solution has the best electrochromic property, light transmission difference from 91% at its bleached state and 5.5% colored state, and charge density of 22 mC/cm2. It is thought that the control of excess hydrogen peroxide and water contents in PTA is very important to enhance the electrochromic properties of WO3 thin film.

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Acknowledgments

The authors are appreciated for the financial support to this research by Korean Ministry of Commerce, Industry, and Energy for its financial support to this research (project no. 10006741).

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Authors and Affiliations

  1. Nanotechnology Convergence Team, Korea Institute of Ceramic Eng. & Tech., 233-5 Gasan-dong Geumcheong-gu, Seoul, 153-801, Korea

    Chang-Yeoul Kim, Min Lee & Seung-Hun Huh

  2. Department of Chemical Engineering, Yonsei University, Seoul, South Korea

    Min Lee & Eun-Kyung Kim

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  1. Chang-Yeoul Kim
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  2. Min Lee
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  3. Seung-Hun Huh
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  4. Eun-Kyung Kim
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Correspondence to Chang-Yeoul Kim.

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Kim, CY., Lee, M., Huh, SH. et al. WO3 thin film coating from H2O-controlled peroxotungstic acid and its electrochromic properties. J Sol-Gel Sci Technol 53, 176–183 (2010). https://doi.org/10.1007/s10971-009-2074-3

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  • DOI: https://doi.org/10.1007/s10971-009-2074-3

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