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Controllable synthesis of W18O49 nanowire arrays and their application in electrochromic devices

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Abstract

Tungsten oxide nanowire arrays as effective electrochromic working electrodes were fabricated on seed-free FTO glass through a facile solvothermal process. Polyethylene glycol was used as the structure-directing agent to control the crystal growth because of selective absorption on the facet of tungsten oxide crystals. Phase identification and growth mechanism of monoclinic W18O49 nanowire arrays are also extensively discussed. Uniform transparent W18O49 nanowire arrays film exhibits remarkable performance of electrochromic properties, which include high contrast (49.64 % at 632.8 nm), high electrochromic stability (>3000 CV cycles), and fast coloration/bleaching response (t c ~ 7.9 s, t b ~ 1.4 s). These properties of the W18O49 nanowire arrays film endow its promising practical applications in large-area smart windows.

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Acknowledgements

We acknowledge the financial support of the Ministry of Science and Technology (MOST) Grant funded by Taiwan government through MOST 103-2221-E-006-089 and NSC 102-2221-E-024-003-MY3.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC

    Chih-Hao Lu, Min Hsiung Hon & Chi-Yun Kuan

  2. Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan, ROC

    Min Hsiung Hon

  3. Department of Materials Science, National University of Tainan, Tainan 701, Taiwan, ROC

    Ing-Chi Leu

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  1. Chih-Hao Lu
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  2. Min Hsiung Hon
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Correspondence to Ing-Chi Leu.

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Lu, CH., Hon, M.H., Kuan, CY. et al. Controllable synthesis of W18O49 nanowire arrays and their application in electrochromic devices. J Mater Sci 50, 5739–5745 (2015). https://doi.org/10.1007/s10853-015-9119-5

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  • DOI: https://doi.org/10.1007/s10853-015-9119-5

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