cambios inducidos en nanotubos de carbono de capa única durante los procesos de purificación
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ID: 153991
2004
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Abstract
A systematic characterisation of single wall carbon nanotubes (SWCNTs) material after successive purification steps, including reflux treatment with nitric acid, air-oxidation and annealing, has been performed. During the nitric acid reflux treatment, micro Raman spectroscopy further proves that the SWCNTs diameter distribution can be selectively tuned towards smaller tubes. On the other hand, the subsequent oxidation/ annealing processes lead to samples preferentially containing larger tube diameter. These findings are further underlined by transmission electron microscopy. The applied purification process efficiently removes the undesired species of metal nanoparticles and amorphous carbon thus resulting in a high quality SWCNTs material.<br><br>Se ha llevado a cabo una caracterización sistemática de nanotubos de carbono de capa única tras sucesivos pasos de purificación (tratamiento a reflujo con ácido nítrico, oxidación al aire y anelado). Durante el tratamiento a reflujo con ácido nítrico, la espectroscopía Raman reveló un desplazamiento de la distribución de diámetros de los nanotubos hacia tamaños menores, sin embargo, los procesos siguientes de oxidación y de anelado aumentaron el contenido de nanotubos de mayor diámetro. La morfología de los haces de nanotubos caracterizada por microscopía electrónica de transmisión ha mostrado un aumento del tamaño de los mismos. Los procesos de purificación aplicados han originado un material con nanotubos de carbono de capa única de alta calidad, con una importante reducción de especies no deseadas tales como carbono amorfo y nanopartículas metálicas.
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| Authors | ;Martínez, M. T.;Callejas, M. A.;Benito, A. M.;Cochet, M.;Seeger, T.;Ansón, A.;Schreiber, J.;Gordon, C.;Marhic, C.;Chauvet, O.;Maser, W. K. |
| Journal | medicinal chemistry (shariqah (united arab emirates)) |
| Year | 2004 |
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