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Deformation response of conformally coated carbon nanotube forests

机译：保形涂层碳纳米管森林的变形响应

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摘要

The deformation mechanism and mechanical properties of carbon nanotube (CNT) forests conformally coated with alumina using atomic layer deposition (ALD) are investigated using in situ and ex situ micro-indentation. While micro-indentation of a CNT forest coated with a thin discontinuous layer using 20 ALD cycles results in a deformation response similar to the response of uncoated CNT forests, a similar test on a CNT forest coated with a sufficiently thick and continuous layer using 100 ALD cycles causes fracture of both the alumina coatings and the core CNTs. With a 10 nm coating, 4-fold and 14-fold stiffness increases are measured using a flat punch and a Berkovich tip, respectively. Indentation testing with the Berkovich tip also reveals increased recoverability at relatively low strains. The results show that ALD coated CNT forests could be useful for applications that require higher stiffness or recoverability. Also, fracturing of the nanotubes shows that upper limits exist in the loading of conformally coated CNT forests.
机译：利用原位和非原位微压痕技术研究了用原子层沉积（ALD）共形涂覆氧化铝的碳纳米管（CNT）林的变形机理和力学性能。虽然使用20个ALD循环对覆盖有不连续薄层的CNT林进行微压痕会导致变形响应类似于未涂覆的CNT林的响应，但对使用100 ALD覆盖有足够厚且连续的层的CNT林进行相似的测试循环会导致氧化铝涂层和核心CNT断裂。对于10 nm的涂层，分别使用平冲头和Berkovich尖端测量到4倍和14倍的刚度增加。使用Berkovich尖端进行的压痕测试还显示，在相对较低的应变下，可恢复性有所提高。结果表明，ALD涂层的CNT林可用于需要更高刚度或可恢复性的应用。而且，纳米管的断裂表明在保形涂覆的CNT森林的负载中存在上限。

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