Measurement of anisotropic thermal conductivity of a dense forest of nanowires using the 3ω method

The 3ω method is a dynamic measurement technique developed for determining the thermal conductivity of thin films or semi-infinite bulk materials. A simplified model is often applied to deduce the thermal conductivity from the slope of the real part of the ac temperature amplitude as a function of t...

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Bibliographic Details
Published in:Review of scientific instruments 2018-08, Vol.89 (8), p.084902-084902
Main Authors: Singhal, Dhruv, Paterson, Jessy, Tainoff, Dimitri, Richard, Jacques, Ben-Khedim, Meriam, Gentile, Pascal, Cagnon, Laurent, Bourgault, Daniel, Buttard, Denis, Bourgeois, Olivier
Format: Article
Language:English
Subjects:
Aluminum oxide
Anisotropy
Complex systems
Condensed Matter
Conduction heating
Conductive heat transfer
Conductivity
Forests
Heat conductivity
Measurement techniques
Mesoscopic Systems and Quantum Hall Effect
Multilayers
Nanowires
Physics
Scientific apparatus & instruments
Substrates
Thermal conductivity
Thermodynamic properties
Thin films
Two dimensional analysis
Two dimensional models
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Summary:The 3ω method is a dynamic measurement technique developed for determining the thermal conductivity of thin films or semi-infinite bulk materials. A simplified model is often applied to deduce the thermal conductivity from the slope of the real part of the ac temperature amplitude as a function of the logarithm of frequency, which in-turn brings a limitation on the kind of samples under observation. In this work, we have measured the thermal conductivity of a forest of nanowires embedded in nanoporous alumina membranes using the 3ω method. An analytical solution of 2D heat conduction is then used to model the multilayer system, considering the anisotropic thermal properties of the different layers, substrate thermal conductivity, and their thicknesses. Data treatment is performed by fitting the experimental results with the 2D model on two different sets of nanowires (silicon and BiSbTe) embedded in the matrix of nanoporous alumina templates, having thermal conductivities that differ by at least one order of magnitude. These experimental results show that this method extends the applicability of the 3ω technique to more complex systems having anisotropic thermal properties.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5025319