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Type: Artigo de periódico
Title: Incorporation Of Nitrogen In Carbon Nanotubes
Author: Droppa Jr. R.
Hammer P.
Carvalho A.C.M.
Dos Santos M.C.
Alvarez F.
Abstract: Nitrogen-doped carbon nanotubes were obtained by the arc-discharge technique in a helium-nitrogen atmosphere and using iron-nickel-cobalt catalysts, The samples were analyzed using spectroscopic techniques (Raman, EELS, X-ray photoelectron spectroscopy) and transmission electron microscopy (TEM). Pure helium atmosphere conditions led to bundles of single-wall nanotubes with diameters of ∼1.5 nm. The presence of nitrogen during tube formation produced irregular and thickly textured tubes. TEM micrographs showed that N suppresses the formation of bundles of single-wall nanotubes, giving rise to nested nanofibers. Quantum-chemical calculations were carried out to study the influence of substitutional N on the tube conformation. The calculations show that the combination of hexagons and pentagons at low N concentration produces kinks that account for the irregular shaped nanotubes. © 2002 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0022-3093(01)01114-0
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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