Journal
ACS NANO
Volume 7, Issue 6, Pages 5114-5121Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400726g
Keywords
carbon nanotube composites; thermal conductivity; acid functionalization
Categories
Funding
- Semiconductor Research Corporation (SRC)
- Defense Advanced Research Project Agency (DARPA) through FCRP Center for Function Accelerated nanoMaterial Engineering (FAME)
- THERMALSKIN FIRB [RBFR10VZUG]
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Carboxylic functionalization (-COOH groups) of carbon nanotubes is known to improve their dispersion properties and increase the electrical conductivity of carbon-nanotube-polymer nanocomposites. We have studied experimentally the effects of this type of functionalization on the thermal conductivity of the nanocomposites. It was found that while even small quantities of carbon nanotubes (similar to 1 wt %) can increase the electrical conductivity, a larger loading fraction (similar to 3 wt %) is required to enhance the thermal conductivity of nanocomposites. Functionalized multi-wall carbon nanotubes performed the best as filler material leading to a simultaneous improvement of the electrical and thermal properties of the composites. Functionalization of the single-wall carbon nanotubes reduced the thermal conductivity enhancement. The observed trends were explained by the fact that while surface functionalization Increases the coupling between carbon nanotube and polymer matrix, it also leads to formation of defects, which impede the acoustic phonon transport in the single-wall carbon nanotubes. The obtained results are important for applications of carbon nanotubes and graphene flakes as fillers for Improving thermal, electrical and mechanical properties of composites.
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