Open Access
Effects of catalyst film thickness on plasma-enhanced carbon nanotube growth (vol 98, pg 034308, 2005)
Stephan Hofmann,Mirco Cantoro,B. Kleinsorge,Cinzia Casiraghi,A. Parvez,John Robertson,Caterina Ducati +6 more
TLDR
In this paper, the influence of catalyst film thickness on carbon nanostructures grown by plasma-enhanced chemical-vapor deposition from acetylene and ammonia mixtures was investigated.Abstract:
A systematic study is presented of the influence of catalyst film thickness on carbon nanostructures grown by plasma-enhanced chemical-vapor deposition from acetylene and ammonia mixtures. We show that reducing the Fe∕Co catalyst film thickness below 3nm causes a transition from larger diameter (>40nm), bamboolike carbon nanofibers to small diameter (∼5nm) multiwalled nanotubes with two to five walls. This is accompanied by a more than 50 times faster growth rate and a faster catalyst poisoning. Thin Ni catalyst films only trigger such a growth transition when pretreated with an ammonia plasma. We observe a limited correlation between this growth transition and the coarsening of the catalyst film before deposition. For a growth temperature of ⩽550°C, all catalysts showed mainly a tip growth regime and a similar activity on untreated silicon, oxidized silicon, and silicon nitride support.read more
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Properties, synthesis, and growth mechanisms of carbon nanotubes with special focus on thermal chemical vapor deposition
TL;DR: Important considerations for in situ characterization and new reactor designs that may enable researchers to better understand the physical growth mechanisms and to optimize the synthesis of CNTs are illustrated, thus contributing to make carbon nanotubes a manufacturing reality.
Journal ArticleDOI
Carbon nanotube growth mechanism switches from tip- to base-growth with decreasing catalyst particle size
TL;DR: In this article, the growth of carbon nanotubes by a plasma assisted catalytic chemical vapor deposition was investigated using cobalt, nickel and iron catalyst particles of different sizes, and it was shown that the growth mode switches from "tip-growth" for large particles (>>5nm) to "base growth" for smaller ones (
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In-situ X-ray Photoelectron Spectroscopy Study of Catalyst−Support Interactions and Growth of Carbon Nanotube Forests
Cecilia Mattevi,C. T. Wirth,Stephan Hofmann,Raoul Blume,Mirco Cantoro,Caterina Ducati,C. Cepek,Axel Knop-Gericke,Stuart Milne,Carla Castellarin-Cudia,Sheema Dolafi,Andrea Goldoni,Robert Schlögl,John Robertson +13 more
TL;DR: In this article, the authors study catalyst support interactions during chemical vapor deposition of carbon nanotubes by in situ X-ray photoelectron spectroscopy over a wide range of pressures and observe Fe 2+ and 3+ interface states for metallic Fe on Al2O3 in the absence of measurable Al reduction.
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A review of plasma enhanced chemical vapour deposition of carbon nanotubes
TL;DR: Plasma enhanced chemical vapour deposition (PECVD) has been widely discussed in the literature for the growth of carbon nanotubes (CNTs) and carbon nanofibres (CNFs) in recent years as discussed by the authors.
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Tailored Assembly of Carbon Nanotubes and Graphene
TL;DR: In this paper, the authors review recent progress in the tailored assembly of carbon nanotubes and graphene into three-dimensional architectures with particular emphasis on their own research employing self-assembly principles.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Journal ArticleDOI
Carbon Nanotubes--the Route Toward Applications
TL;DR: Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects.
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Self-Oriented Regular Arrays of Carbon Nanotubes and Their Field Emission Properties
Shou-Shan Fan,Michael Chapline,Nathan R. Franklin,Thomas W. Tombler,Alan M. Cassell,Hongjie Dai +5 more
TL;DR: The synthesis of massive arrays of monodispersed carbon nanotubes that are self-oriented on patterned porous silicon and plain silicon substrates is reported and the mechanisms of nanotube growth and self-orientation are elucidated.
Journal ArticleDOI
Synthesis of Large Arrays of Well-Aligned Carbon Nanotubes on Glass
TL;DR: Large panels of aligned carbon nanotubes can be made under conditions that are suitable for device fabrication under plasma-enhanced hot filament chemical vapor deposition.
Journal Article
Water-Assisted Highly Efficient Synthesis of Impurity-Free Single-Walled Carbon Nanotubes-``Super-Growth''
TL;DR: Water-stimulated enhanced catalytic activity results in massive growth of superdense and vertically aligned nanotube forests with heights up to 2.5 millimeters that can be easily separated from the catalysts, providing nanotubes material with carbon purity above 99.98%.