In this work we present a systematic study of the effects of high temperature treatments on the macroscopic physical and mechanical properties of millimeters thick layers of self-standing vertically aligned multi wall carbon nanotubes (MWCNTs). Annealing treatments were carried out on pristine MWCNT chunks in argon gas, in the temperature range of 1500–2200 °C. The analysis showed a change in most of the physical properties as an effect of the graphitization process. Raman results showed a monotonic increase in the crystallite size as the annealing temperature increases due to the lattice defect removal kinetic. Improvement in thermal stability exhibited by thermo-gravimetric analysis in oxidative environment witness a significant reduction in defectiveness. X-ray diffraction confirmed a higher degree of ordering after the annealing process and indicated no significant re-arrangement of the interlayer spacing between the graphene shells. Loading tests showed, beside a negligible change of maximum load, an increase in elastic modulus proportional to the annealing temperature.
Improving macroscopic physical and mechanical properties of thick layers of aligned multiwall carbon nanotubes by annealing treatment / S. MUSSO; M. GIORCELLI; M. PAVESE; S. BIANCO; M. ROVERE; TAGLIAFERRO A.. - In: DIAMOND AND RELATED MATERIALS. - ISSN 0925-9635. - STAMPA. - 17:(2008), pp. 542-547. [10.1016/j.diamond.2007.10.034]
|Titolo:||Improving macroscopic physical and mechanical properties of thick layers of aligned multiwall carbon nanotubes by annealing treatment|
|Data di pubblicazione:||2008|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.diamond.2007.10.034|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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