분말 -원자층 증착법 기반 탄소나노튜브의 열안정성 향상
Improving thermal stability of carbon nanotubes using powder-atomic-layer-deposition
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초록
탄소나노튜브(CNT)는 뛰어난 기계적 강도, 높은 전기 전도도 및 열 전도도로 인해 다양한 복합 재료의 필러로 주 목을 받고 있다. 그러나 CNT의 낮은 열안정성으로 인해 고온/고압의 복합 재료 소결 조건을 적용하기가 힘들고, 이로 인해 해 당 카본 소재의 활용범위를 제한되는 문제가 있다. 본 연구에서는 분말 원자층 증착(PALD)을 사용하여 나노미터 두께의 알루 미나(Al2O3) 층으로 표면을 코팅하여 CNT의 열 안정성을 향상시킬 수 있는 혁신적인 기술을 개발하였다. Al2O3 층의 두께는 PALD 공정에서 전구체 주입 주기를 조정하여 정밀하게 제어할 수 있음을 확인하였고, 열중량 분석(TGA)을 통해 코팅된 CNT의 열분해 시작온도가 70°C 증가해 열 안정성이 크게 개선되었음을 입증하였다. 이 연구는 PALD 코팅을 통해 CNT의 열 안정성을 개선하는 새로운 접근 방식을 제안하였으며, 이를 통해 탄소 기반 재료의 적용 범위를 확장할 수 있을 것으로 기대된다.
Abstract
Carbon nanotubes (CNTs) have garnered significant attention as fillers in various composite materials due to their exceptional mechanical strength, high electrical conductivity, and thermal conductivity. However, their application is often restricted by their limited thermal stability at elevated temperatures during the fabrication of CNT-based composites. In this study, we developed an innovative technique to enhance the thermal stability of CNTs by coating their surfaces with nanometer-sized alumina (Al2O3) layers using powder atomic layer deposition (PALD). The thickness of the Al2O3 layer was precisely controlled by adjusting the precursor injection cycle in the PALD process. Thermogravimetric analysis (TGA) revealed a significant improvement in the thermal stability of the coated CNTs, with an increase of 70°C in the onset temperature of degradation. This study introduces a novel approach to improving the thermal stability of CNTs via PALD coating, which holds potential for broadening the scope of applications for carbon-based materials.
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