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One-directional thermal transport in densely aligned single-wall carbon nanotube films

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5127209· OSTI ID:1800377
 [1];  [2];  [3];  [3];  [2];  [2];  [4];  [2]
  1. The University of Tokyo, Japan (Asia). Department of Mechanical Engineering; OSTI
  2. The University of Tokyo, Japan (Asia). Department of Mechanical Engineering
  3. Rice University, Houston, Texas (United States). Department of Electrical and Computer Engineering
  4. Rice University, Houston, Texas (United States). Department of Electrical and Computer Engineering; Rice University, Houston, Texas (United States). Department of Physics and Astronomy; Rice University, Houston, Texas (United States). Department of Materials Science and NanoEngineering,

Individual carbon nanotubes (CNTs) possess extremely high thermal conductivities. However, the thermal conductivities and their anisotropy of macroscopic assemblies of CNTs have so far remained small. Here, we report the results of directional thermal transport measurements on a nearly perfectly aligned CNT film fabricated via controlled vacuum filtration. We found the thermal conductivity to be 43 ± 2.2 W m-1 K-1 with a record-high thermal anisotropy of 500. From the temperature dependence of the thermal conductivity and its agreement with the atomistic phonon transport calculation, we conclude that the effect of intertube thermal resistance on heat conduction in the alignment direction is negligible because of the large contact area between CNTs. These observations thus represent ideal unidirectional thermal transport, i.e., the thermal conductivity of the film is determined solely by that of individual CNTs.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-06ER46308
OSTI ID:
1800377
Alternate ID(s):
OSTI ID: 1575949
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 115; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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