Linking catalyst composition to chirality distributions of as-grown single-walled carbon nanotubes by tuning NixFe1-x nanoparticles
Linking catalyst composition to chirality distributions of as-grown single-walled carbon nanotubes by tuning NixFe1-x nanoparticles
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DOI：
10.1038/nmat2531
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发表时间：
2009-11-01
期刊：
影响因子：
41.2
通讯作者：
Sankaran, R. Mohan
中科院分区：
文献类型：
--
作者：
Chiang, Wei-Hung;Sankaran, R. Mohan
从纳米电子学到纳米医学的各种应用都需要手性纯单壁碳纳米管 (SWCNT)(1)。尽管人们在单壁碳纳米管混合物的分离方面付出了巨大的努力，包括密度梯度超速离心 (2)、色谱法 (3) 和电泳 (4)，但初始手性分布是在生长过程中确定的，必须对其进行控制，以实现非破坏性、可扩展和经济的生产。在这里，我们表明，通过改变 NixFe1-x 纳米催化剂的成分可以改变生长时的 SWCNT 的手性分布。通过基于大气压微等离子体的新气相合成路线，实现了纳米催化剂成分在恒定尺寸下的精确调节。纳米催化剂的成分依赖性晶体结构与由此产生的纳米管手性之间的联系支持外延模型，并且是朝着单壁碳纳米管手性选择性生长迈出的一步。
Chirally pure single-walled carbon nanotubes (SWCNTs) are required for various applications ranging from nanoelectronics to nanomedicine(1). Although significant efforts have been directed towards separation of SWCNT mixtures, including density-gradient ultracentrifugation(2), chromatography(3) and electrophoresis(4), the initial chirality distribution is determined during growth and must be controlled for non-destructive, scalable and economical production. Here, we show that the chirality distribution of as-grown SWCNTs can be altered by varying the composition of NixFe1-x nanocatalysts. Precise tuning of the nanocatalyst composition at constant size is achieved by a new gas-phase synthesis route based on an atmospheric-pressure microplasma. The link between the composition-dependent crystal structure of the nanocatalysts and the resulting nanotube chirality supports epitaxial models and is a step towards chiral-selective growth of SWCNTs.