인장변형에 따른 그래핀복합 카본블랙전극의 저항변화연구
A Study on the Electrical Resistivity of Graphene Added Carbon Black Composite Electrode with Tensile Strain
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초록
신축성 전극소재는 웨어러블 밴드나 전자피부와 같은 플렉서블 제품으로의 적용 때문에 주목 받고 있다. 플렉서블 소자로서 사용하기 위해선 구부리거나 비틀거나 늘리는 등 물리적 변형에도 전기저항의 증가가 최소화되어야 한다. 카본블랙은 저가의 간단한 공정, 특히 인장 시 비저항의 감소라는 장점 때문에 후보소재로 고려되고 있다. 하지만 카본블랙의 전도도는 전극으로 사용되기에 상대적으로 낮다. 이에 비해 그래핀은 뛰어난 전기전도도 및 유연성 때문에 촉망받고 있는 전자소재이다. 따라서 그래핀을 첨가한 카본블랙은 신축성 전극으로 적합한 소재로 예상된다. 본 논문을 통해 인장 시 그래핀을 첨가한 카본전극의 전기적 특성을 연구하였다. 기계적인 인장은 전극 내의 균열(crack)을 형성시켜 도전경로의 파괴를 일으켰다. 하지만 인장으로 정렬된 그래핀은 카본필러 간의 연결성을 강화하고 도전구조를 유지하였다. 무엇보다도 그래핀 첨가로 인하여 인장 시 카본전극의 전자구조가 변화하여 전자를 효과적으로 전도하게 하였다. 결론적으로 그래핀 첨가를 통해 카본블랙 복합체에 신축성 전극으로의 가능성을 부여하였다.
Abstract
Stretchable electrode materials are focused to apply to flexible device such as e-skin and wearable computer. Used as a flexible electrode, increase in electrical resistance should be minimalized under physical strain as bend, stretchand twist. Carbon black is one of candidates, for it has many advantages of low cost, simple processing, and especiallyreduction in resistivity with stretching. However electrical conductivity of carbon black is relatively low to be used forelectrodes. Instead graphene is one of the promising electronic materials which have great electrical conductivity andflexibility. So it is expected that graphene added carbon black may be proper to be used for stretchable electrode. In thisstudy, under stretching electrical property of graphene added carbon black composite electrode was investigated. Mechanical stretching induced cracks in electrode which means breakage of conductive path. However stretching inducedaligned graphene enhanced connectivity of carbon fillers and maintained conductive network. Above all, electronicstructure of carbon electrode was changed to conduct electrons effectively under stretching by adding graphene. Inconclusion, an addition of graphene gives potential of carbon black composite as a stretchable electrode.
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