멜라민과의 기계적 혼합을 통한 탄소나노튜브의 선택적 질소 도핑
Selective nitrogen doping of carbon nanotubes through different mechanical mixing methods with melamine
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초록
질소 도핑에 의한 Pyridinic-N, Pyrrolic-N, Graphitic-N 과 같은 결합 구성의 형성은 탄소나노소재의 물리적 특성을 조절하거나 새로운 물성을 부여하는 중요한 역할을 한다. 본 연구에서는 멜라민을 도펀트 소스로 혼합하여 탄소 나노튜브(CNT)의 질소 결합 구성을 조절하는 간단하고 비용 효율적인 접근 방식을 제안한다. Stirring, Bath sonication 및 Tip sonication과 같은 세 가지 기계적 방법을 통해 멜라민을 탄소나노튜브와 혼합한 후 열처리를 통해 질소 도핑을 진행하였다. CNT 대비 멜라민 비율이 높을수록 Pyrrolic-N의 비율이 높게 나타났으며 Stirring을 통해 혼합한 경우 가장 높은 Pyridinic-N의 비율을 나타내었다. 본 연구에서 제안한 방법은 기계적인 혼합 방법을 이용해 탄소나노튜브에 다양한 종류의 질소 도펀트를 선택적으로 형성할 수 있는 손쉬운 방법으로, 향후 질소가 도핑된 탄소나노물질의 응용을 용이하게 할 것으로 기대된다.
Abstract
The formation of bonding configurations such as pyridinic-N, pyrrolic-N, and graphitic-N by nitrogen doping plays a crucial role in imparting distinct physical properties to carbon nanomaterials. In this study, we propose a simple and cost-effective approach to regulate nitrogen dopant configurations in carbon nanotubes (CNTs) by mixing melamine as a dopant source. We employed three distinct mechanical mixing techniques, namely magnetic stirring, bath sonication and tip sonication. The higher the ratio of melamine to CNT, the higher the ratio of Pyrrolic-N, and when mixed through stirring, the highest ratio of Pyridinic-N was shown. The facile method proposed in this study, which can easily form various types of nitrogen dopants in carbon nanotubes, is expected to facilitate the application of nitrogen-doped carbon nanomaterials.
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