Journal ArticleDOI
Alignment mechanism of carbon nanofibers produced by plasma-enhanced chemical-vapor deposition
Vladimir I. Merkulov,Anatoli V. Melechko,Michael A. Guillorn,Douglas H. Lowndes,Michael L. Simpson +4 more
TLDR
In this paper, the alignment of carbon nanofibers is explained as a result of a feedback mechanism associated with a nonuniform stress that is created across the interface of the catalyst particle with the CNF due to electrostatic forces.Abstract:
We report experimental evidence showing a direct correlation between the alignment of carbon nanofibers (CNFs) prepared by plasma-enhanced chemical-vapor deposition and the location of the catalyst particle during CNF growth. In particular, we find that CNFs that have a catalyst particle at the tip (i.e., growth proceeds from the tip) align along the electric-field lines, whereas CNFs with the particle at the base (i.e., growth proceeds from the base) grow in random orientations. We propose a model that explains the alignment process as a result of a feedback mechanism associated with a nonuniform stress (part tensile, part compressive) that is created across the interface of the catalyst particle with the CNF due to electrostatic forces. Furthermore, we propose that the alignment seen recently in some dense CNF films is due to a crowding effect and is not directly the result of electrostatic forces.read more
Citations
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Journal ArticleDOI
Carbon nanotube growth by PECVD: a review
TL;DR: In this article, a review of the low temperature plasma research community that has successfully addressed such issues, through plasma and surface diagnostics and modelling, in semiconductor processing and diamond thin film growth is presented.
Journal ArticleDOI
Vertically Aligned Carbon Nanofibers and Related Structures: Controlled Synthesis and Directed Assembly
Anatoli V. Melechko,Vladimir I. Merkulov,Timothy E. McKnight,Michael A. Guillorn,Kate L. Klein,Douglas H. Lowndes,Michael L. Simpson +6 more
TL;DR: In this article, a review of the application areas for carbon nanotubes and nanofibers including electron field-emission sources, electrochemical probes, functionalized sensor elements, scanning probe microscopy tips, nanoelectromechanical systems (NEMS), hydrogen and charge storage, and catalyst support.
Journal ArticleDOI
Colloquium: Reactive plasmas as a versatile nanofabrication tool
TL;DR: In this article, the benefits and challenges of using plasma-based systems in nanofabrication of nanostructured silicon films, low-dimensional semiconducting quantum structures, ordered carbon nanotip arrays, highly crystalline ${\mathrm{TiO}}_{2}$ coatings, and nano-structured hydroxyapatite bioceramics are discussed.
Journal ArticleDOI
Plasma nanoscience: from nano-solids in plasmas to nano-plasmas in solids
TL;DR: The unique plasma-specific features and physical phenomena in the organization of nanoscale soild-state systems in a broad range of elemental composition, structure, and dimensionality are critically reviewed in this paper.
Journal ArticleDOI
Plasma Nanoscience: from Nano-Solids in Plasmas to Nano-Plasmas in Solids
TL;DR: In this paper, a unified conceptual framework based on the control of production, transport, and self-organization of precursor species is introduced and a variety of plasma-specific non-equilibrium and kinetics-driven phenomena across the many temporal and spatial scales is explained.
References
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Journal ArticleDOI
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.
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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 ArticleDOI
Catalytic growth of carbon filaments
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.
Journal ArticleDOI
Continuous production of aligned carbon nanotubes: a step closer to commercial realization
Rodney Andrews,David Jacques,Apparao M. Rao,Frank Derbyshire,Dali Qian,X. Fan,Elizabeth C. Dickey,J. Chen +7 more
TL;DR: In this paper, high-purity aligned multi-walled carbon nanotubes were synthesized through the catalytic decomposition of a ferrocene-xylene mixture at ; 6758C in a quartz tube reactor and over quartz substrates, with a conversion of ; 25% of the total hydrocarbon feedstock.
Journal ArticleDOI
Scanning field emission from patterned carbon nanotube films
L. Nilsson,O. Groening,C. Emmenegger,O. Kuettel,E. Schaller,Louis Schlapbach,Hannes Kind,Jean-Marc Bonard,Klaus Kern +8 more
TL;DR: In this article, the authors investigated the field emission properties of carbon nanotube (CNT) films by a scanning anode FE apparatus, revealing a strong dependence on the density and morphology of the CNT deposit.