Graphitic encapsulation of catalyst particles in carbon nanotube production

Ding, Feng,1970Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg (author)

A new model is proposed for the encapsulation of catalyst metal particles by graphite layers that are obtained, for example, in low-temperature chemical vapor deposition production of carbon nanotubes (CNTs). In this model graphite layers are primarily formed from the dissolved carbon atoms in the metal-carbide particle when the particle cools. This mechanism is in good agreement with molecular dynamics simulations (which show that precipitated carbon atoms preferentially form graphite sheets instead of CNTs at low temperatures) and experimental results (e.g., encapsulated metal particles are found in low-temperature zones and CNTs in high-temperature regions of production apparatus, very small catalyst particles are generally not encapsulated, and the ratio of the number of graphitic layers to the diameter of the catalyst particle is typically 0.25 nm(-1)).

NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
NATURVETENSKAP Kemi hsv//swe
NATURAL SCIENCES Chemical Sciences hsv//eng
MAGNETIC-PROPERTIES
SWNT GROWTH
NANOPARTICLES
NI
SINGLE-WALLED NANOTUBES
SIZE
MOLECULAR-DYNAMICS
METAL PARTICLES
GAS-PHASE
NANOCAPSULES
SINGLE-WALLED NANOTUBES; METAL PARTICLES; MAGNETIC-PROPERTIES; MOLECULAR-DYNAMICS; SWNT GROWTH; GAS-PHASE; NANOPARTICLES; NANOCAPSULES; SIZE; NI

Rosen, Arne,1939Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg(Swepub:gu)xrosar (author)
Campbell, Eleanor E B,1960Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg(Swepub:gu)xcamel (author)
Falk, Lena,1956Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lklfalk (author)
Bolton, Kim,1964Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg(Swepub:gu)xbolki (author)
Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

In:Journal of Physical Chemistry B: American Chemical Society (ACS)110:15, s. 7666-76701520-52071520-6106

By the author/editor: Ding, Feng, 1970; Rosen, Arne, 193 ...; Campbell, Eleano ...; Falk, Lena, 1956; Bolton, Kim, 196 ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

By the university: Chalmers University of Technology; University of Gothenburg

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