Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Highly Tough, Flexible Poly(vinyl alcohol): Liquid Metal Composite Electrodes for Electric Heater

폴리비닐알콜-액체금속 복합소재 기반 고인성 유연 전극 히터 연구

  • Chanwoo Park (School of Chemical Engineering, Pusan National University) ;
  • Beomjin Jeong (School of Chemical Engineering, Pusan National University)
  • 박찬우 (부산대학교 응용화학공학부) ;
  • 정범진 (부산대학교 응용화학공학부)
  • Received : 2024.08.02
  • Accepted : 2024.08.24
  • Published : 2024.08.31
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Abstract

Flexible electrodes are an essential component for wearable electronic devices and heaters, which can lead to applications such as heating textile, on-body integrated thermotherapy, and heat-driven soft actuators. The electrodes should be mechanically flexible and highly conductive for efficient heat generation, and avoid toxic materials for human-compatibility. Herein, we developed highly conductive composite films with nontoxic components of poly(vinyl alcohol) (PVA) matrix and liquid metal eutectic galliumindium (EGaIn) fillers. The PVA:EGaIn composite film was processed by simple solution mixing and casting. It is revealed that optimal drying condition is necessitated to develop electrically conductive percolation paths through spontaneous sedimentation of EGaIn micro-particles, which is critical for electrode performance. The resultant PVA:EGaIn film exhibited high electrical conductivity of 563 S/cm, Joule-heating temperature up to 82.4 ℃, and excellent flexibility and toughness that can maintain electrical conductivity over 1,000 bending cycles. Our study suggests a simple route for developing mechanically durable electrodes that can be extensively applied for flexible and wearable electronic devices.

Keywords

Acknowledgement

본 연구는 2021학년도 부산대학교 교내학술연구비(신임교수연구정착금)에 의한 연구임.

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