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단일벽 탄소나노튜브와 다중벽 탄소나노튜브 사용에 따른 고분자 복합체의 기계적, 전기적 물성
강병호,허오녕,홍순국,박성훈 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.9
To manufacture composites with required properties, it is extremely important to select an appropriate filler. Carbon-based nano materials such as carbon black, graphene and carbon nanotube (CNT) have been extensively investigated as reinforcing and conducting fillers. Because of their high aspect ratio coupled with superior physical properties, 1-dimensional CNTs are ideal as filler materials to impart electrical conductivity to insulating polymers, while enhancing mechanical strength. In this study, we investigated the piezo-resistive and mechanical properties of composites consisting of two types of CNT classified as multiwalled CNT (MWNT) or single-walled CNT (SWNT) depending on the number of walls. Since MWNT and SWNT have different physical properties such as specific surface area and aspect ratio, this can affect the composite’s performance. To more effectively evaluate the effect of MWNTs and SWNTs in composites, we used thermoplastic polyurethane (TPU) as a matrix, which is an insulating stretchable elastomer. Morphological and mechanical/electrical characterizations were conducted to determine differences in the MWNT and SWNT composites. In addition, we conducted dynamic strain sensing tests on each type of CNT composites to compare the sensitivity as a strain sensor. Differences in piezo-resistive behaviors were attributed to the loss of electrical contact points during stretching. These results can serve as a useful design guideline for the wider use of CNT composites.
다양한 조건에서 탄소나노튜브 복합체의 정전용량식과 압저항식 압력센서 성능 비교
오지현,김동영,김현우,허오녕,박성훈 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.1
유연한 압력센서는 전자 피부, 로봇 공학 및 웨어러블 분야에서 상당한 응용 가능 성으로 가장 많이 연구된 주제이다. 본 연구에서는 유연한 압력센서를 만들기 위해 전도성 고분자 복합체를 제작했다. 전도성 고분자 복합체는 전도성 충전제인 탄소 나노튜브(CNT)와 폴리머 매트릭스인 polydimethylsiloxane(PDMS)를 사용했다. 그리고 압력 감지 원리에 따라 다양한 특성이 있다. 따라서 압력 감지 원리로 용량성과 압저항 효과를 이용하여 가장 기본적인 평행판 구조에서 압력 감지 거동을 조사했다. 압력 감지 거동은 작동 원리에 따라 감도, 반복성, 히스테리시스 및 온도 의존성을 필러의 함량에 따라 비교했다. 본 연구를 통해 압력 감지 원리를 이해 하고 작동 원리와 필러의 함량에 따른 성능 비교 연구를 수행하여 다양한 조건에서 압력 센서에 대한 어플리케이션 적용 가능성을 고찰했다.
Kang Byung-Ho,Hong Jinyong,허오녕,Kang Minji,Moon Jiyun,Seo Jooyoung,Han Gyeongrim,Shin Suhyun,Lee Chang-Soo,Park Sung-Hoon,Bae Joonwon 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
A carbonaceous monolith material was produced from polyacrylonitrile@lignin (PAN@lig) composite hybrid; the sensing and adsorption capabilities of the material were evaluated. Because the two carbon-based precursors, PAN and lignin, have different characteristics, the resulting carbonaceous hybrid material was expected to exhibit unique properties. The controlled carbonization of PAN@lig produced a carbonaceous monolith with characteristic external and internal structures. Electron microscopy and cyclic voltammetry analyses of the morphological and electrochemical features of the monolith revealed stable structural and electrochemical properties. The hybrid, which acted as an electrochemical capacitor because of the electrical conductivity of the monolith, was suitable for use as a sensing material. The feasibility of using the carbonaceous monolith as a sensing medium was demonstrated by extensive electrical measurements of a simple sensor geometry. The carbonaceous hybrid also demonstrated the capacity to adsorb toxic chemicals/substances, such as radioactive heavy metal ions. The adsorption behavior was analyzed using several isotherm and kinetic models.