结构稳定、散热量大的柔性纳米碳管@热解炭复合纸的制备（英文）

A flexible carbon nanotube-pyrolytic carbon sandwich paper with a stable structure and high heat-dissipation capacity

通过在纳米碳管纸上沉积热解炭层的方法来提升其结构稳定性并保持其优异的性能。这种纳米碳管@热解炭复合纸可以被切割成任意形状而无开口式破裂。在500次往复弯曲后,其内部结构仍保持完整。弯折前后,复合纸的拉伸强度从8.58MPa提升至11.41MPa,这是因为内部纳米碳管取向更加趋于一致。复合纸的热扩散率和散热量几乎保持不变,并接近同尺度的铜箔,这归功于纳米碳管增强的热解炭层及内部纳米碳管网络在变形过程中没有损伤。故这种复合纸有望作为一种轻质柔性的散热材料。

A thin layer of pyrolytic carbon (PyC) was deposited on a carbon nanotube paper (CNP) by chemical vapor deposition from methane to improve its structural stability while maintaining its excellent mechanical and thermal conductivity performance. The resulting material consisted of layers of PyC carbon on the outer surfaces, a layer of bare CNTs in the center, and layers of CNTs infiltrated with PyC between the outer and inner layers. The resulting sandwich material could be cut into any size without breaking the surrounding material. The CNTs in the center layer were stretched after the CNP was bent 500 times around a cylindrical die, leading to an increase of tensile strength from 8.58 to 11.41 MPa. The outer PyC layers and the PyC-infiltrated layers retained their integrity. The thermal diffusivity and heat-dissipation capacity of the sandwich paper remain almost the same before and after bending, which is attributed to the undamaged CNTs and PyC layers. This paper has potential applications as a lightweight and flexible heat-dissipation material at high temperatures.