Abstract Effect of oxide coating thickness and strain rate on mechanical properties of vertically aligned carbon nanotubes (VACNT) forest and patterned pillars have been investigated using flat punch nanoindentation. The elastic modulus of 20 nm oxide coated VACNT forest and micro-pillars show a remarkable increase of 135 times and 77 times respectively as compared to uncoated CNT forest samples. Large enhancement in load carrying capacity of oxide-coated VACNT is observed when the strain rate is varied from 50 nm/s to 4000 nm/s in micro compression tests. The elastic strain energy density of the 20 nm coated VACNT forest is estimated to be ~260 times higher than the as-grown VACNT forest. Patterned CNT pillar with coating of 20 nm Al2O3 shows 77 times increment with the strain rate.

中文翻译：

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压缩下 Al2O3 涂层 VACNT 森林结构的机械性能提升

摘要 氧化物涂层厚度和应变速率对垂直排列的碳纳米管 (VACNT) 林和图案柱的机械性能的影响已经使用平面冲压纳米压痕进行了研究。与未涂覆的 CNT 森林样品相比，20 nm 氧化物涂层的 VACNT 森林和微柱的弹性模量分别显着增加了 135 倍和 77 倍。在微压缩试验中，当应变速率从 50 nm/s 变化到 4000 nm/s 时，观察到氧化物涂层 VACNT 的承载能力有很大提高。20 nm 涂层 VACNT 森林的弹性应变能量密度估计比生长的 VACNT 森林高约 260 倍。具有 20 nm Al2O3 涂层的图案化 CNT 柱随着应变速率显示 77 倍的增量。