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Article
Limited Thermal Conductance of Metal-Carbon Interfaces
Journal of Applied Physics
  • Jaime J. Gengler, Air Force Research Laboratory
  • Sergei V. Shenogin, Air Force Research Laboratory
  • John E. Bultman, University of Dayton
  • Ajit K. Roy, Air Force Research Laboratory
  • Andrey A. Voevodin, Air Force Research Laboratory
  • Christopher Muratore, University of Dayton
Document Type
Article
Publication Date
1-1-2012
Abstract
The thermal conductance for a series of metal-graphite interfaces has been experimentally measured with time-domain thermoreflectance (TDTR). For metals with Debye temperatures up to ∼400 K, a linear relationship exists with the thermal conductance values. For metals with Debye temperatures in excess of ∼400 K, the measured metal-graphite thermal conductance values remain constant near 60 MW m−2 K−1. Titanium showed slightly higher conductance than aluminum, despite the closeness of atomic mass and Debye temperature for the two metals. Surface analysis was used to identify the presence of titaniumcarbide at the interface in contrast to the aluminum and gold-carbon interfaces (with no detectablecarbide phases). It was also observed that air-cleaved graphite surfaces in contact with metals yielded slightly higher thermal conductance than graphite surfaces cleaved in vacuo. Examination of samples with scanning electron microscopy revealed that the lack of absorbed molecules on the graphite surfaceresulted in differences in transducer film morphology, thereby altering the interface conductance.Classical molecular dynamic simulations of metal-carbon nanotube thermal conductance values were calculated and compared to the TDTR results. The upper limit of metal-graphite thermal conductance is attributed to the decreased coupling at higher frequencies of the lighter metals studied, and to the decreased heat capacity for higher vibrational frequency modes.
Inclusive pages
094904-1 to 094904-6
ISBN/ISSN
0021-8979
Document Version
Published Version
Comments

This document is provided for download in compliance with the publisher's policy on self-archiving. Permission documentation is on file.

Publisher
AIP Publishing
Peer Reviewed
Yes
Citation Information
Jaime J. Gengler, Sergei V. Shenogin, John E. Bultman, Ajit K. Roy, et al.. "Limited Thermal Conductance of Metal-Carbon Interfaces" Journal of Applied Physics Vol. 112 (2012)
Available at: http://works.bepress.com/christopher-muratore/28/