5.5 GPa下碳纳米管的热稳定性研究

Study on Thermal Stability of Nanotubes under High Pressure

1.
Department of Mechanic Engineering, Tsinghua University, Beijing 100083, China;
2.
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

摘要: 利用X射线衍射和透射电子显微镜研究了碳纳米管在5.5 GPa下的热稳定性问题。根据以往的研究在常压真空条件下碳纳米管的热稳定性非常好，其结构在2 800 ℃以下可能并不发生变化。实验中发现，虽然在5.5 GPa压力下冷压作用后碳纳米管的微结构没有明显的改变，但在950 ℃既开始发生改变，转变成类巴基葱和类条带结构，而在1 150 ℃其结构转变成石墨结构。高压是这种转变的主要原因，高压可以促使碳纳米管管结构的破裂，从而减小了它的热稳定性。
- 碳纳米管 /
- 高压 /
- 热稳定性
Abstract: In this paper, the thermal stability of nanotubes under 5.5 GPa was studied by X-ray diffraction and transmission electron microscopy. According to previous research results, at high vacuum and ambient pressure, the structure of nanotubes will be kept below temperature of 3 000 K. However, in our study, its structure begin to change at only 950 ℃ under 5.5 GPa; and the nanotubes will transform into graphite at 1 150 ℃. High pressure may be contributed to the transformation. High pressure may promote nanotubes transform into graphite, and decrease thermal stability.
- nanotubes /
- high pressure /
- thermal stability