Thermal Diffusivity Measurements of COntinuous Vertically Aligned Carbon Nanotube Arrays(VANTAS) and their composite
- ORNL
This letter reports on fast and highly anisotropic thermal transport through millimeter-tall, vertically aligned carbon nanotube arrays (VANTAs) synthesized by chemical vapor deposition on Si substrates. Thermal diffusivity measurements were performed for both longitudinal and transverse to the nanotube alignment direction, with longitudinal values as large as 2.1 {+-} 0.2 cm{sup 2}/s and anisotropy ratios as large as 72. Longitudinal thermal conductivities of 15.3 {+-} 1.8 W/(m K) for porous 8 {+-} 1 vol % VANTAs in air and 5.5 {+-} 0.7 W/(m K) for epoxy-infiltrated VANTAs already exceed those of phase-changing thermal interface materials used in microelectronics. Data suggest that further improvements are possible through optimization of density and defects in the arrays.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 938731
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 89; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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