Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Liquid Metal Enabled Flexible Fiber Microelectrode for Dopamine Sensor Applications

액체금속을 활용한 플렉서블 섬유상 전극 제조 및 도파민 센서로의 응용

  • Lim, Taehwan (Advanced Textile R&D Department, Korea Institute of Industrial Technology) ;
  • Lee, Sohee (Department of Clothing and Textiles, Gyeongsang National University) ;
  • Yeo, Sang Young (Advanced Textile R&D Department, Korea Institute of Industrial Technology)
  • 임태환 (한국생산기술연구원 융합기술연구소 섬유연구부문) ;
  • 이소희 (경상국립대학교 자연과학대학 의류학과) ;
  • 여상영 (한국생산기술연구원 융합기술연구소 섬유연구부문)
  • Received : 2022.07.28
  • Accepted : 2022.08.16
  • Published : 2022.08.31
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Abstract

Gallium-based liquid metals have gained significant attention as promising material platforms for flexible bioelectronics owing to their fluidic behavior but still metallic. However, low electrochemical stability owing to oxidation may limit the use of bioelectronics that typically operate under physiological conditions. Here, we developed a liquid metal core/polymer shell fiber platform for flexibility. Then, nanostructured conductive poly(3,4-ethylenedioxythiophene) (PEDOT) was encapsulated on the liquid metal surface to prevent oxidation. Mechanical property measurement demonstrated that the platform displayed high flexibility and low Young's modulus that could minimize the mechanical mismatch between the fiber platform and soft human tissues. PEDOT encapsulation on the liquid metal surface offered the fiber platform-based electrode considerably higher electrochemical properties, such as lower impedance and higher charge storage capacity. The improved electrochemical performance enables the liquid metal-based fiber electrode to be used for electrochemical dopamine (DA) monitoring. This study demonstrated that the PEDOT structured flexible electrode had a sensitivity of 0.218±0.022 μA/μM and a limit of detection of 150 nM. Finally, the electrode could effectively detect DA under a plethora of byproducts produced by human metabolism. All the results confirmed the flexibility and remarkable electrochemical properties of the prepared liquid metal-based electrode, opening numerous design opportunities for next-generation liquid metal-based bioelectronics.

Keywords

Acknowledgement

이 논문은 한국생산기술연구원의 지원을 받아 수행된 연구임(과제번호 EH220005).

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