Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Electrodeposited WO3 films and their application in electrochromic boards

  • Kim, Dae-Hyeon (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education (KOREATECH)) ;
  • Kang, Kwang-Mo (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education (KOREATECH)) ;
  • Nah, Yoon-Chae (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education (KOREATECH))
  • Received : 2022.08.21
  • Accepted : 2022.08.24
  • Published : 2022.08.31
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Abstract

WO3 thin films were synthesized by electrodeposition, and their electrochromic properties were investigated. The application of static voltage produced WO3 films with a smooth, compact surface morphology, and the film thickness linearly increased with the application time. The thicker film showed a strong color contrast but a slow color-switching speed. High-temperature heat treatment exceeding 300 ℃ induced a phase transformation from an amorphous to a monoclinic structure and resulted in degraded electrochromic performance. Furthermore, the optimized WO3 thin films demonstrated their potential application as electrochromic boards for writing and erasing letters using a simple modified 3D printer in a rapid, accurate process

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1F1A1062961) and was also supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE)(2021RIS-004). This paper was supported by Education and Research promotion program of KOREATECH in 2020. The authors acknowledge the FE-SEM measurement by Cooperative Equipment Center at KOREATECH.

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