Journal
ACS NANO
Volume 5, Issue 6, Pages 4818-4825Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn200847u
Keywords
carbon nanotubes; nanocomposites; thermal conductivity; thermal interface materials
Categories
Funding
- ONR [N00014-09-1-0296-P00004]
- NSF-DOE [CBET0853350]
- National Science Foundation
- Stanford Graduate Fellowship program
- Airbus S.A.S.
- Boeing
- Embraer
- Hexcel
- Lockheed Martin
- Saab AB
- Spirit AeroSystems
- Textron Inc.
- Linda and Richard [1958]
- Hardy Fellowship
- National Science Foundation [DMR-0819762]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819762] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1048796] Funding Source: National Science Foundation
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Nanostructured composites containing aligned carbon nanotubes (CNTs) are very promising as interface materials for electronic systems and thermoelectric power generators. We report the first data for the thermal conductivity of densified, aligned multiwall CNT nanocomposite films for a range of CNT volume fractions. A 1 vol % CNT composite more than doubles the thermal conductivity of the base polymer. Denser arrays (17 vol % CNTs) enhance the thermal conductivity by as much as a factor of 18 and there is a nonlinear trend with CNT volume fraction. This article discusses the Impact of CNT density on thermal conduction considering boundary resistances, increased defect concentrations, and the possibility of suppressed phonon modes in the CNTs.
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