Ultraviolet pulsed laser irradiation of multi-walled carbon nanotubes in nitrogen atmosphere
Pérez del Pino, Ángel (Institut de Ciència de Materials de Barcelona)
Gyorgy, Eniko (Institut de Ciència de Materials de Barcelona)
Cabana Jiménez, Laura (Institut de Ciència de Materials de Barcelona)
Ballesteros, Belén (Institut Català de Nanociència i Nanotecnologia)
Tobias, Gerard (Institut de Ciència de Materials de Barcelona)

Data:	2014
Resum:	Laser irradiation of randomly oriented multi-walled carbon nanotube (MWCNT) networks has been carried out using a pulsed Nd:YAG UV laser in nitrogen gas environment. The evolution of the MWCNT morphology and structure as a function of laser fluence and number of accumulated laser pulses has been studied using electron microscopies and Raman spectroscopy. The observed changes are discussed and correlated with thermal simulations. The obtained results indicate that laser irradiation induces very fast, high temperature thermal cycles in MWCNTs which produce the formation of different nanocarbon forms, such as nanodiamonds. Premelting processes have been observed in localized sites by irradiation at low number of laser pulses and low fluence values. The accumulation of laser pulses and the increase in the fluence cause the full melting and amorphization of MWCNTs. The observed structural changes differ from that of conventional high temperature annealing treatments of MWCNTs.
Ajuts:	European Commission 290023 Ministerio de Economía y Competitividad MAT2011-24757
Nota:	Altres ajuts: this work was supported by the Spanish National Research Council under the Contract Nos. 200960I015, 200860I211.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	High temperature ; High temperature annealing treatments ; Laser fluences ; Morphology and structures ; Nitrogen atmospheres ; Nitrogen gas ; Thermal simulations ; Ultraviolet pulsed lasers
Publicat a:	Journal of applied physics, Vol. 115, issue 9 (March 2014) , art. 93501, ISSN 1089-7550

DOI: 10.1063/1.4864776

Postprint 27 p, 4.8 MB

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