Assessing the thermal conductivity of non-uniform thin-films: Nanocrystalline Cu composites incorporating carbon nanotubes

Kang, Stephen D.; Joon Yoo, Jung; Lyeo, Ho-Ki; Yong Song, Jae; Lee, Sungjun; Yu, Jin
July 2011
Journal of Applied Physics;Jul2011, Vol. 110 Issue 2, p023506
Academic Journal
We demonstrate a procedure for measuring the thermal conductivity of non-ideal thin-films with significant non-uniformity. By spatially mapping the thermal transport with time-domain thermoreflectance measurements, followed by statistical analysis, we determined the thermal conductivity of Cu composite films containing dispersed carbon nanotubes (CNTs). The thermal conductivity of the composite decreased from 188 to 60 W/m K as 1.8 wt. % of multi-walled CNTs was incorporated into nanocrystalline Cu. We compared the decreasing trend with that calculated from a scattering model to find out that the CNTs scatter the heat carriers in Cu.


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