ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
THERMAL TRANSPORT IN GRAPHENE BASED NANOMATERIALS
要約
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.