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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL TRANSPORT IN GRAPHENE BASED NANOMATERIALS

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.021857
pages 8579-8588

Abstract

The increasing power density and decreasing dimensions of transistors present severe thermal challenges to the design of modern microprocessors. To address such problem, thermal properties of graphene has been subjects of intensive investigations. In this work, I will present our recent progress on developing graphene based nanomaterials for novel heat management applications. We show that by replacing the inter-layer van der Waals interaction with the covalent sp2 bond with the CNT, the graphene-CNT (G-CNT) hybrid outperforms graphene by more than 2 orders of magnitude for the c-axis heat transfer, while its thermal resistance is 3 orders of magnitude lower than the state-of-the-art thermal interface materials. When immersed in water, the G-CNT hybrid can provide sustainable cooling of high temperature and high heat flux hot surfaces via the solid-liquid interaction. In addition, we find the hexagonal boron nitride as a substrate can significantly improve the thermal transport in supported graphene. Interestingly, we find the temperature dependence of thermal conductivity in graphene can be controlled by the defect concentration, which has a significant impact on the phonons with long mean free path. Such control of thermal conductivity opens doors for novel heat management applications, such as thermal diode, phonon nanocapacitor and thermal cloaking.