【摘 要】
：
Although significant progress has been made for one-dimensional systems,the study of heat conduction in two-dimensional systems is still in its infancy due
【机 构】
：
CenterforPhononicsandThermalEnergyScience,SchoolofPhysicsScienceandEngineering,TongjiUniversity,Shan
【出 处】
：
The 2nd International Conference on Phononics and thermal En
论文部分内容阅读
Although significant progress has been made for one-dimensional systems,the study of heat conduction in two-dimensional systems is still in its infancy due to the lack of proper materials and the challenge in suspending atomic-thick membrane suitable for thermal transport measurements.Here,we present the experimental studies of thermal conductivity in suspended graphene using thermal bridge method.In submicron suspended single layer graphene(SLG),at T<100K,thermal conductance scale temperature as~T 1.68 and approach the ballistic limit,indicating high sample quality in the measured graphene and that the flexural acoustic phonons(ZA)dominate the thermal conduction [1].This contribution from ZA phonons is found to be systematically suppressed by impurity atoms(Au atoms)on the surface of tri-layer suspended graphene [2].Interestingly and in contrast to bulk materials,when temperature at 300K in SLG,thermal conductivity keeps increasing and remains logarithmic divergence with sample length even for sample lengths much larger than the average phonon mean free path [1].This result is a consequence of the two-dimensional nature of phonons in graphene and possible mechanisms are discussed.
其他文献
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
Graphite and graphene have attracted tremendous research interests in the past decade because of their superior electrical and thermal properties.So far,ext
In recent years,nanoelectromechanical systems(NEMS)have been in the limelight of intense experimental and theoretical investigation due to their potential a
Molecular dynamic simulations reveal that the ultrathin carbon nanotube(CNT)(2,1)with a reconstructed structure exhibits a surprisingly low thermal conducti