The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Fabrication and Transfer of Laser Induced Graphene (LIG) Electrode for Flexible Substrate-based Electrochemical Sensor Applicatins

유연 기판 기반 전기화학 센서 응용을 위한 레이저 유도 그래핀 전극 제작 및 전사 연구

  • Kim, Jeong Dae (Dept. of Electrical and Electronic Engineering, Korea University) ;
  • Kim, Taeheon (Dept. of Electrical and Electronic Engineering, Korea University) ;
  • Pak, Jungho (Dept. of Electrical and Electronic Engineering, Korea University)
  • Received : 2018.01.30
  • Accepted : 2018.02.27
  • Published : 2018.03.01
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Abstract

This paper describes the fabrication process of laser induced graphene (LIG) and its transfer method on to a flexible and stretchable PDMS substrate. By irradiating CO2 laser on a polyimide(PI) film surface, a localized high temperature is created, resulting in a three-dimensional porous graphene network structure with good conductivity. This LIG electrode is relatively easy to fabricate and since it is very weak the LIG electrode was transferred to a flexible PDMS substrate to increase the sturdiness as well as possible use in flexible applications. Sheet resistance, thickness, and electrochemical activity of the fabricated in-situ LIG electrodes have been examined and compared with the LIG electrodes after transferring to PDMS elastomer. The properties of the LIG electrodes were also examined depending on the $CO_2$ laser power. As the irradiated laser power increased, the LIG electrode resistance decreases and the LIG electrode thickness increased. At 4.8 W of laser power, the average sheet resistance and thickness of the fabricated LIG electrodes were approximately $31.7{\Omega}/{\Box}$ and $62.67{\mu}m$, respectively. Moreover, the electrochemical activity of the fabricated LIG electrode at 4.8 W of laser power showed a high oxidation current of $28.2{\mu}A$ after transferring to PDMS.

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References

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