Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Transmissive-to-Green-to-Black Gradient Color Switching of Electrochromic Fabric Devices with Strong Heat-Absorption Capability

녹색-흑색 그라데이션 전기변색섬유의 제조와 열흡수 특성 연구

  • Do Yeon Kim (School of Chemical Engineering, Pusan National University) ;
  • Jong S. Park (School of Chemical Engineering, Pusan National University)
  • 김도연 (부산대학교 응용화학공학부) ;
  • 박종승 (부산대학교 응용화학공학부)
  • Received : 2023.10.23
  • Accepted : 2023.12.21
  • Published : 2023.12.31
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Abstract

Viologen-based electrochromic materials have been frequently reported, with a wide visible range of reversible colors. According to the theory of subtractive color mixing, achromatic black color can be produced by blending the primary chromatic components in proper proportions. However, a single-component black viologen is still rare due to the limited conjugation length required for entire visible light absorption. In this study, we have synthesized an asymmetric viologen that produces a true black color. Furthermore, to fabricate electrochromic fabric devices (ECFDs), the layer-by-layer structure is applied to a polyester fabric substrate, and the conductive electrode is prepared by spray-coating silver nanowire and PEDOT:PSS. The ECFDs exhibit outstanding absorption behaviors with green-to-black gradient color switchings, extending into the near-infrared region. Superb electrochromic behaviors include a low voltage requirement of -2 V, a significant optical contrast of 54.1% at 608 nm, a high coloration efficiency of 192.8 cm2/C, and long-term switching stability for up to 4,000 seconds, with switching times of less than 20 seconds. Additionally, these ECFDs are durable when bent and are resistant to water. Furthermore, the exceptional heat-absorption capability of the resulting black ECFDs is also assessed. The findings illustrate the successful development and potential of color-changing fabric devices, opening up efficient heat-absorbing e-textile applications.

Keywords

Acknowledgement

이 논문은 과학기술정보통신부의 재원으로 한국연구재단의지원을받아수행된연구임(RS-2023-00221396).

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