Author
F.S. Feates
Bio: F.S. Feates is an academic researcher. The author has contributed to research in topics: Catalysis & Amorphous carbon. The author has an hindex of 2, co-authored 2 publications receiving 1131 citations.
Topics: Catalysis, Amorphous carbon, Acetylene, Graphite, Filamentous carbon
Papers
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TL;DR: In the presence of a nickel catalyst, acetylene decomposed to form carbonaceous solids with filamentary, amorphous, or laminar form as discussed by the authors, and parameters controlling the type of deposit have been established.
1,142 citations
TL;DR: A flocculent amorphous deposit only formed in the presence of iron particles at temperatures above 900 K and plate-like growths developed about iron particles in contact with a graphite substrate, which are believed to be recrystallised graphite.
22 citations
Cited by
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TL;DR: In this article, the use of carbon nanotubes (CNT) and nanofibers as catalysts and catalysts supports has been analyzed from the early 1990s until the beginning of 2003.
Abstract: This review analyses the literature from the early 1990s until the beginning of 2003 and covers the use of carbon nanotubes (CNT) and nanofibers as catalysts and catalysts supports. The article is composed of three sections, the first one explains why these materials can be suitable for these applications, the second describes the different preparation methods for supporting metallic catalysts on these supports, and the last one details the catalytic results obtained with nanotubes or nanofibers based catalysts. When possible, the results were compared to those obtained on classical carbonaceous supports and explanations are proposed to clarify the different behaviors observed.
1,742 citations
TL;DR: Carbon fibres have been prepared by pyrolysing a mixture of benzene and hydrogen at about 1100°C and have been studied by high resolution electron microscopy.
1,540 citations
TL;DR: Time-resolved, high-resolution in situ transmission electron microscope observations of the formation of carbon nanofibres from methane decomposition over supported nickel nanocrystals show that metallic step edges act as spatiotemporal dynamic growth sites and may be important for understanding other types of catalytic reactions and nanomaterial syntheses.
Abstract: The synthesis of carbon nanotubes with predefined structure and functionality plays a central role in the field of nanotechnology1,2, whereas the inhibition of carbon growth is needed to prevent a breakdown of industrial catalysts for hydrogen and synthesis gas production3. The growth of carbon nanotubes and nanofibres has therefore been widely studied4,5,6,7,8,9,10. Recent advances in in situ techniques now open up the possibility of studying gas–solid interactions at the atomic level11,12. Here we present time-resolved, high-resolution in situ transmission electron microscope observations of the formation of carbon nanofibres from methane decomposition over supported nickel nanocrystals. Carbon nanofibres are observed to develop through a reaction-induced reshaping of the nickel nanocrystals. Specifically, the nucleation and growth of graphene layers are found to be assisted by a dynamic formation and restructuring of mono-atomic step edges at the nickel surface. Density-functional theory calculations indicate that the observations are consistent with a growth mechanism involving surface diffusion of carbon and nickel atoms. The finding that metallic step edges act as spatiotemporal dynamic growth sites may be important for understanding other types of catalytic reactions and nanomaterial syntheses.
1,357 citations
TL;DR: A review of the information obtained by the author and his many co-workers from studies devoted to the formation of a fascinating material, filamentous carbon, is given in this article.
1,145 citations
TL;DR: In this paper, the growth of vertically aligned carbon nanotubes using a direct current plasma enhanced chemical vapor deposition system was reported, and the growth properties were studied as a function of the Ni catalyst layer thickness, bias voltage, deposition temperature, C2H2:NH3 ratio, and pressure.
Abstract: The growth of vertically aligned carbon nanotubes using a direct current plasma enhanced chemical vapor deposition system is reported. The growth properties are studied as a function of the Ni catalyst layer thickness, bias voltage, deposition temperature, C2H2:NH3 ratio, and pressure. It was found that the diameter, growth rate, and areal density of the nanotubes are controlled by the initial thickness of the catalyst layer. The alignment of the nanotubes depends on the electric field. Our results indicate that the growth occurs by diffusion of carbon through the Ni catalyst particle, which rides on the top of the growing tube.
1,060 citations