Journal
DIAMOND AND RELATED MATERIALS
Volume 17, Issue 4-5, Pages 542-547Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2007.10.034
Keywords
multi-wall carbon nanotubes; CVD; properties; graphitization
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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 degrees 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 then-no-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. (C) 2007 Elsevier B.V. All rights reserved.
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