Anisotropic Thermal and Electrical Properties of Thin Thermal Interface Layers of Graphite Nanoplatelet-Based Composites
By Xiaojuan Tian, M. Itkis, E. Bekyarova, R. Haddon. Scientific Reports, 2013
157 citations recorded by the source corpus.
Thermal interface materials (TIMs) are crucial components of high density electronics and the high thermal conductivity of graphite makes this material an attractive candidate for such applications. We report an investigation of the in-plane and through-plane electrical and thermal conductivities of thin thermal interface layers of graphite nanoplatelet (GNP) based composites. The in-plane electrical conductivity exceeds its through-plane counterpart by three orders of magnitude, whereas the ratio of the thermal conductivities is about 5. Scanning electron microscopy reveals that the anisotropy in the transport properties is due to the in-plane alignment of the GNPs which occurs during the formation of the thermal interface layer. Because the alignment in the thermal interface layer suppresses the through-plane component of the thermal conductivity, the anisotropy strongly degrades the performance of GNP-based composites in the geometry required for typical thermal management applications and must be taken into account in the development of GNP-based TIMs.
Subfields: Materials Chemistry, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/0a1f3099d079d1c4d816b998b0c3513de3196d6e
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Citations in the corpus
- Heat and fluid flow in high-power LED packaging and applications (2016, background): “The experimental results [167] show that kTIM of GNP-epoxy in the horizontal direction can be five times higher than that in the vertical direction when GNPs are oriented horizontally.”
- A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods (2018, background): “mally conductive polymers can be divided into isotropic polymers and anisotropic polymers [54, 55].”