Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays

Ilia Ivanov; Alexander Puretzky; Gyula Eres; Hsin Wang; Zhengwei Pan; Hongtao Cui; Rongying Jin; Jane Howe; David B. Geohegan

doi:10.1063/1.2397008

Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays

Ilia Ivanov, Alexander Puretzky, Gyula Eres, Hsin Wang, Zhengwei Pan, Hongtao Cui, Rongying Jin, Jane Howe, David B. Geohegan

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

163 Scopus citations

Abstract

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 cm2 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.

Original language	English
Article number	223110
Journal	Applied Physics Letters
Volume	89
Issue number	22
DOIs	https://doi.org/10.1063/1.2397008
State	Published - 2006

Funding

Synthesis science [I.I., A.P., G.E., D.G., R.J., H.C., Z.P.] supported by DOE Office of Basic Energy Sciences, Division of Materials Science and Engineering. [J.H., H.W.] supported by DOE Office of Transportation Technologies, Energy Efficiency and Renerable Energy. The authors also acknowledge helpful discussions with Ralph Dinwiddle, Art Miller, and Roland Seals and equipment development funded by DARPA's Defense Science Office. Oak Ridge National Laboratory is managed and operated by UT-Battelle, LLC for the U.S. Department of Energy under contract DE-AC05-00OR22725.

Funders	Funder number
DOE Office of Basic Energy Sciences
DOE Office of Transportation Technologies
Defense Science Office
Division of Materials Science and Engineering
U.S. Department of Energy	DE-AC05-00OR22725
Defense Advanced Research Projects Agency

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AU - Ivanov, Ilia

AU - Puretzky, Alexander

AU - Eres, Gyula

AU - Wang, Hsin

AU - Pan, Zhengwei

AU - Cui, Hongtao

AU - Jin, Rongying

AU - Howe, Jane

AU - Geohegan, David B.

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AB - 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 cm2 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.

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Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays

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