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
Synthesis and cryogenic spectroscopy of narrow-diameter single-wall carbon nanotubes
Matthias S. Hofmann,Jonathan Noé,Manuel Nutz,Alexander Kneer,Raphael Dehmel,Lilian S. Schaffroth,Alexander Högele +6 more
TL;DR: In this article, the authors report chemical vapor deposition and cryogenic photoluminescence studies of narrow-diameter single-wall carbon nanotubes on silica substrates.
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SWCNT growth from C:Ni nanocomposites
Abstract: Carbon:nickel (C:Ni) nanocomposite thin films deposited by ion beam co‐sputtering were used for catalytic chemical vapor deposition (CVD) growth of single‐walled carbon nanotubes (SWCNTs). The SWCNTs were characterized by scanning electron microscopy and Raman spectroscopy. The approach allows a precise and reproducible control of the catalyst diameter, while the embedding carbon matrix prevents the particles from coalescence during catalyst activation and nanotube growth. The SWCNTs obtained from Ni particles with ∼4 nm diameter have a radial breathing mode frequency distribution of 147.5 ± 32 cm−1 and a diameter distribution of 1.6 ± 0.4 nm. Small line widths of the radial breathing mode and ID/IG ratios of 0.05 indicate SWCNTs with a low defect concentration.
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Self-aligned Cu etch mask for individually addressable metallic and semiconducting carbon nanotubes.
TL;DR: Unlike electrical breakdown methods, this approach allows the selection of the single most conducting metallic CNT from an array of as-grown CNTs with average resistance ∼14 times lower than that of as -fabricated single metallic C NTs.
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Controllable Synthesis of Carbon Nanotubes
Jianing An,Zhaoyao Zhan,Lianxi Zheng +2 more
- 01 Jan 2017
TL;DR: In this article, the synthesis of carbon nanotubes with an emphasis on controllable synthesis is discussed in terms of their controllability over diameter, chirality, wall number, length, location, and orientation/alignment.
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•Dissertation
Growth and Characterization of Single-walled Carbon Nanotubes from Chemically Synthesized Catalyst Precursors
Alice Castan
- 25 Jan 2018
TL;DR: In this article, a method combining surface chemistry and coordination chemistry is presented for single-walled carbon nanotube (S WCNT) growth by chemical vapor deposition, through the tuning of catalyst nanoparticle composition.
5
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