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|Type:||Artigo de periódico|
|Title:||Incorporation Of Nitrogen In Carbon Nanotubes|
|Author:||Droppa Jr. R.|
Dos Santos M.C.
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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