Flame synthesis of carbon nanotubes using catalyst particles prepared by laser ablation

Randy Lee Vander Wal, Gordon M. Berger, Thomas M. Ticich

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

Flame synthesis of carbon nanotubes using catalyst particles prepared by laser ablation was studied. A greater yield of nanofibers of greater length were produced with the CO/C2H2 based gas mixture than with C2H2 alone. The reactivity of nickel towards C2H2 (at the same concentration) in the absence of CO increased, where fewer nanofibers, of shorter lengths were produced (along with encapsulated particles). Ultrasmall Ni particles (< 4 nm) might not be particularly active towards catalyzing C2H2 dissociation. Fe exhibited selective reactivity towards CO. Moreover, the absence of nanofibers of MWNT suggested a decline in reactivity with increasing particle size for Fe nanoparticles, in contrast to nickel. In a metal nanoparticle, the density of electronic states is finite and the traditional conduction and valence bands are absent due to the small number of constituent atoms.

Original languageEnglish (US)
Pages (from-to)879-880
Number of pages2
JournalACS Division of Fuel Chemistry, Preprints
Volume49
Issue number2
StatePublished - Sep 1 2004

Fingerprint

Flame synthesis
Laser ablation
Nanofibers
Carbon nanotubes
Catalysts
Nickel
Electronic density of states
Metal nanoparticles
Valence bands
Conduction bands
Gas mixtures
Particle size
Nanoparticles
Atoms

All Science Journal Classification (ASJC) codes

  • Energy(all)

Cite this

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abstract = "Flame synthesis of carbon nanotubes using catalyst particles prepared by laser ablation was studied. A greater yield of nanofibers of greater length were produced with the CO/C2H2 based gas mixture than with C2H2 alone. The reactivity of nickel towards C2H2 (at the same concentration) in the absence of CO increased, where fewer nanofibers, of shorter lengths were produced (along with encapsulated particles). Ultrasmall Ni particles (< 4 nm) might not be particularly active towards catalyzing C2H2 dissociation. Fe exhibited selective reactivity towards CO. Moreover, the absence of nanofibers of MWNT suggested a decline in reactivity with increasing particle size for Fe nanoparticles, in contrast to nickel. In a metal nanoparticle, the density of electronic states is finite and the traditional conduction and valence bands are absent due to the small number of constituent atoms.",
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Flame synthesis of carbon nanotubes using catalyst particles prepared by laser ablation. / Vander Wal, Randy Lee; Berger, Gordon M.; Ticich, Thomas M.

In: ACS Division of Fuel Chemistry, Preprints, Vol. 49, No. 2, 01.09.2004, p. 879-880.

Research output: Contribution to journalConference article

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