Abstract
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.
Highlights
The advances in synthesis techniques have allowed the integration of carbon nanotubes (CNT) in many industrial applications as energy, electronics, biomedicine, or environmental areas.1 In such one-dimensional systems, defects play a major role and can even dominate the physical and chemical properties of CNTs
We study the structural modification of multi-walled carbon nanotubes (MWCNT) induced by nsUV laser irradiation in an inert N2 gas atmosphere
The evolution of the MWCNT morphology, structure, and composition with the accumulation of laser pulses shows that UV laser irradiation produces the formation of different nanocarbon forms
Summary
The advances in synthesis techniques have allowed the integration of carbon nanotubes (CNT) in many industrial applications as energy, electronics, biomedicine, or environmental areas. In such one-dimensional systems, defects play a major role and can even dominate the physical and chemical properties of CNTs. The advances in synthesis techniques have allowed the integration of carbon nanotubes (CNT) in many industrial applications as energy, electronics, biomedicine, or environmental areas.. The advances in synthesis techniques have allowed the integration of carbon nanotubes (CNT) in many industrial applications as energy, electronics, biomedicine, or environmental areas.1 In such one-dimensional systems, defects play a major role and can even dominate the physical and chemical properties of CNTs. For instance, the response of chemical sensors composed of CNT networks is mainly determined by the chemical reactivity of their defects and tube-tube junctions.. A main route towards the structural transformation of CNTs goes via high thermal annealing processes.4 These processes are energy and time consuming, and they are not compatible with the use of polymeric substrates which decompose at relatively low temperature A main route towards the structural transformation of CNTs goes via high thermal annealing processes. these processes are energy and time consuming, and they are not compatible with the use of polymeric substrates which decompose at relatively low temperature
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