【摘 要】
：
Graphite and graphene have attracted tremendous research interests in the past decade because of their superior electrical and thermal properties.So far,ext
【机 构】
：
DepartmentofMechanicalandAutomationEngineeringandShunHingInstituteofAdvancedEngineering,TheChineseUn
【出 处】
：
The 2nd International Conference on Phononics and thermal En
论文部分内容阅读
Graphite and graphene have attracted tremendous research interests in the past decade because of their superior electrical and thermal properties.So far,extensive studies have been conducted on thermal transport properties of graphite and graphene,especially on in-plane thermal conductivity [1-3] and contact thermal resistance between graphene and other materials [4].However,the phonon mean free path of graphite in the cross-plane direction has not been well understood yet.For example,the simplified kinetic theory predicted that the cross-plane phonon mean free path of graphite is only a few nanometers [5],but recent molecular dynamics simulations indicated that it could be as large as 2000 nm at room temperature [6].In this work,we experimentally tackle this problem by carefully characterizing the cross-plane thermal conductivities of graphite flakes with thicknesses ranging from tens to hundreds nanometers via the three omega method.The graphite flakes are prepared on the silicon substrate by the mechanical exfoliation method.At 300 K,the measured cross-plane thermal conductivities of graphite flakes with thicknesses ranging from 20 nm to 400 nm are substantially lower than the counterpart of the bulk graphite and increase with the thickness.Our results indicate that the cross-plane phonon mean free path of graphite is above 400 nm at room temperature.
其他文献
Bismuth selenide(Bi2Se3)belongs to the(Bi,Sb)2(Se,Te)3 family,which has been long known as excellent thermoelectric materials.Recently,various Bi2Se3 nanost
Recently,thermal rectifier with inhomogeneous thermal conductivity has been theoretically proposed and experimentally observed.We theoretically investigate
Sonic crystal,analogous to photonic crystal,has been studied over two decades.Some of important effects,such as band-gap,dispersion relation,have been well
In this work,we propose a nanoscale three dimensional(3D)Si phononic crystal(PnC) with spherical pores,which can reduce the thermal conductivity of bulk Si
By the second law of thermodynamics,there exists a physical quantity Q that,at a given instant,is associated with each surface in a non-isothermal body.This
In this poster we present the electron beam heating technique – a technique that is capable of profiling the thermal resistance along a single nanowire wit
Higher manganese silicide(HMS)has been studied for several decades as a p-type thermoelectric material that is made of non-toxic and earth-abundant elements
A non-equilibrium molecular dynamics simulation model is established to investigate the impact of vdW strength on thermal transport along the in-plane and o
Guided by a thought-experiment we develop a self-consistent anharmonic phonon concept for nonlinear lattices.The procedure simultaneously identifies the exi
We found that 2mol%potassium doped PbQ(Q = Te,Se,S)compounds have low thermal conductivity and therefore show good thermoelectric performance,especially in