Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 44, Pages 9406-9411Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc01540a
Keywords
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Funding
- Air Force Office of Scientific Research [FA9550-09-1-0367, FA9550-11-1-0330]
- NSF LASIGMA Project [EPS-1003897, NSF92010-15-RII-SUBR]
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Multi-walled carbon nanotube (MWCNT)-epoxy composites with MWCNT (outer diameter 8-15 nm) loadings from 0.1 to 5 wt% were fabricated. The morphologies, conductivities, dielectric permittivities, and electromagnetic (EM) wave absorptions of the MWCNT-epoxy composites were investigated. The results showed that the EM wave absorptions strongly depended on the complex permittivities of the composites. An abrupt enhancement of conductivity by 9 orders of magnitude for the composite sample with 5 wt% MWCNT loading was observed, which is associated with a sharp improvement in the electromagnetic absorption in the R band (26.5-40 GHz) and is characterized by the formation of a conductive network structure consisting of separated MWCNT aggregates and connected MWCNT bundle bridges in the composites. The electrically-conductive composite allows charge transport between the conductive MWCNT components and contributes to the substantial improvement of the electromagnetic absorption of the MWCNT-epoxy composites.
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