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High-yield synthesis of bundles of double- and triple-walled carbon nanotubes on aluminum flakes
Carbon ( IF 10.9 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.carbon.2018.03.014
Thiago H.R. da Cunha , Sergio de Oliveira , Icaro L. Martins , Viviany Geraldo , Douglas Miquita , Sergio L.M. Ramos , Rodrigo G. Lacerda , Luiz O. Ladeira , Andre S. Ferlauto

Abstract High-quality double- and triple-walled carbon nanotubes have been synthesized using Fe−Co catalysts supported on aluminum flake powder. The diameters and lengths of the obtained nanotubes are in the ranges of 3–8 nm and 150–300 μm, respectively, and the specific surface area were quoted as 600 m2/g. The yield of the nanotubes synthesis relative to the initial weight of the catalyst is in the order of 1200%, with 70% of the resulting material consisting of thin carbon nanotubes with less than 6 nm of outer diameter and carbon purity of greater than 90%. Our results indicate that the use of aluminum as catalyst support have a profound effect in the formation of the metal nanoparticles. In addition to boost the reduction the catalyst precursors, the high chemical reactivity of metallic aluminum drives the thermal formation of an oxide layer on the Al surface that suppresses the diffusion and aggregation of catalyst nanoparticles. As a result, a simple impregnation method can be adopted to produce catalyst nanoparticles with narrow size distribution that are suitable for the growth of few wall carbon nanotubes at high yield and large scale.

中文翻译:

铝片上双壁和三壁碳纳米管束的高产合成

摘要 使用负载在铝片粉末上的 Fe-Co 催化剂合成了高质量的双壁和三壁碳纳米管。所得纳米管的直径和长度分别在 3-8 nm 和 150-300 μm 范围内,比表面积为 600 m2/g。纳米管合成的产率相对于催化剂的初始重量约为 1200%,其中 70% 的所得材料由外径小于 6 nm 且碳纯度大于 90% 的薄碳纳米管组成. 我们的结果表明,使用铝作为催化剂载体对金属纳米颗粒的形成具有深远的影响。除了促进催化剂前体的还原,金属铝的高化学反应性促使在铝表面热形成氧化层,抑制催化剂纳米颗粒的扩散和聚集。因此,可以采用简单的浸渍方法制备尺寸分布较窄的催化剂纳米颗粒,适用于高产、大规模生长的少壁碳纳米管。
更新日期:2018-07-01
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