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Graphitic encapsulation of catalyst particles in carbon nanotube production

Feng Ding ; Arne Rosen ; Eleanor E B Campbell ; Lena K. L. Falk (Institutionen för teknisk fysik) ; Kim Bolton
Journal of Physical Chemistry B (1520-6106). Vol. 110 (2006), 15, p. 7666-7670.
[Artikel, refereegranskad vetenskaplig]

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)).

Nyckelord: SINGLE-WALLED NANOTUBES; METAL PARTICLES; MAGNETIC-PROPERTIES; MOLECULAR-DYNAMICS; SWNT GROWTH; GAS-PHASE; NANOPARTICLES; NANOCAPSULES; SIZE; NI



Denna post skapades 2007-10-29. Senast ändrad 2013-07-17.
CPL Pubid: 58985

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för teknisk fysik (1900-2015)

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Övrig teknisk materialvetenskap

Chalmers infrastruktur