ACS Appl Mater Interfaces. 2011 Nov;3(11):4180-4. doi: 10.1021/am201082m. Epub 2011 Oct 18.
To synthesize long and uniform vertically aligned carbon nanotube (VACNT) arrays, it is essential to use catalytic nanoparticles (NPs) with monodisperse sizes and to avoid NP agglomeration at the growth temperature. In this work, VACNT arrays were grown on chemically synthesized Fe(3)O(4) NPs of diameter 6 nm by chemical vapor deposition. Coating the NPs with a thin layer of Al(2)O(3) prior to CNT growth preserves the monodisperse sizes, resulting in uniform, thick and dense VACNT arrays. Comparison with uncoated NPs shows that the Al(2)O(3) coating effectively prevents the catalyst NPs from sintering and coalescing, resulting in improved control over VACNT growth.
为了合成长而均匀的垂直排列的碳纳米管（VACNT）阵列，使用具有单分散尺寸的催化纳米颗粒（NPs）并避免在生长温度下 NPs 团聚是至关重要的。在这项工作中，通过化学气相沉积在化学合成的直径为 6nm 的 Fe(3)O(4) NPs 上生长了 VACNT 阵列。在 CNT 生长之前，用一层薄薄的 Al(2)O(3)涂覆 NPs，可以保持单分散尺寸，从而得到均匀、厚实且致密的 VACNT 阵列。与未涂覆的 NPs 进行比较表明，Al(2)O(3)涂层有效地防止了催化剂 NPs 的烧结和聚集，从而更好地控制了 VACNT 的生长。
