Journal
JOURNAL OF APPLIED PHYSICS
Volume 124, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5048813
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Funding
- University of Denver Interdisciplinary Research Fund
- Petroleum Research Fund of the American Chemical Society
- National Science Foundation (NSF) [1511199]
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We derive an analytical model of diffusive thermal transport in multilayer structures of spherical symmetry and apply it to transient thermoreflectance measurements of gold nanoparticles embedded in a polymer matrix. This multilayer approach significantly improves the quantitative measurement of material thermal properties, in comparison with single-layer methods. The model adapts the typical planar transfer matrix model to a spherical geometry, and we apply it to transient thermoreflectance (TTR) experiments on gold nanoparticles embedded in a polymer matrix, to published TTR data for aqueous platinum nanoparticles, and also to example systems of aqueous gold and platinum nanoparticles. We measure a thermal boundary conductance value of 410MW/m(2)K at the nanoparticle gold/polymer interface. The sensitivity of the TTR signal to system thermal properties is predicted as a function of the particle/matrix thermal boundary resistance (TBR), and we discuss the differentiation of TBR and capping layer effects on a TTR signal. Published by AIP Publishing.
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