A preservation study of carbon nanotubes in alumina-based nanocomposites via Raman spectroscopy and nuclear magnetic resonance |
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Authors: | KE Thomson Dongtao Jiang RO Ritchie AK Mukherjee |
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Institution: | (1) Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA;(2) Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA |
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Abstract: | Raman spectroscopy was used to study the preservation of the carbon nanotube structure in nanotube-reinforced alumina nanocomposites
consolidated via spark plasma sintering (SPS). A series of Raman spectroscopy experiments was used to identify the thermal
breakdown temperature of single-walled carbon nanotubes (SWCNTs) embedded in nanocrystalline alumina. It was found that the
carbon nanotube structure remains intact after sintering at 1150 °C, but almost completely breaks down by 1350 °C after only
5 min. Also, 27Al nuclear magnetic resonance (NMR) was used to study the chemical and structural effects of high-energy ball milling (HEBM)
and SPS consolidation on pure alumina and SWCNT-alumina nanocomposites. HEBM does not change the mixed coordination number
of the as-received alumina, but slight peak shifts indicate residual stresses. No Al4C3 was detected in any of the consolidated samples – even up to 1550 °C for 10 min. Thus, it is concluded that consolidation
of carbon nanotube-reinforced composites should be completed at temperatures below ∼1250 °C in order to preserve the carbon
nanotube structure.
PACS 61.18.Fs; 61.46.Fg; 61.82.Rx; 62.25.+g; 76.60.-k |
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Keywords: | |
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