Journal Article10.1038/NMAT2531
Linking catalyst composition to chirality distributions of as-grown single-walled carbon nanotubes by tuning Ni x Fe 1− x nanoparticles
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TL;DR: It is shown that the chirality distribution of as-grown SWCNTs can be altered by varying the composition of Ni(x)Fe(1-x) nanocatalysts, which supports epitaxial models and is a step towards chiral-selective growth of SWC NTs.
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Abstract: Chirally pure single-walled carbon nanotubes (SWCNTs) are required for various applications ranging from nanoelectronics to nanomedicine. Although significant efforts have been directed towards separation of SWCNT mixtures, including density-gradient ultracentrifugation , chromatography and electrophoresis, 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 Ni(x)Fe(1-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.
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Citations
Chirality‐Dependent Reactivity of Individual Single‐Walled Carbon Nanotubes
Bilu Liu,Bilu Liu,Hua Jiang,Arkady V. Krasheninnikov,Albert G. Nasibulin,Wencai Ren,Chang Liu,Esko I. Kauppinen,Hui-Ming Cheng +8 more
TL;DR: It is shown that the reactivity of SWCNTs to O2 is intricately related to their diameters, metallicity, and chiral angles, which concords with first-principles calculations.
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Dai-Ming Tang,Chang Liu,Yu Wanjing,Lide Zhang,Peng-Xiang Hou,Jin-Cheng Li,Feng Li,Yoshio Bando,Dmitri Golberg,Hui-Ming Cheng +9 more
TL;DR: In this article, a simple, versatile in situ transmission electron microscopy (TEM) approach for investigating the nucleation and growth mechanism of carbon nanotubes (CNTs), by which the composition and phase transition of various catalysts can be clearly resolved.
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