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We study the intrinsic transport properties of suspended graphene devices at high fields (>1 V/um) and high temperatures (>1000 K). Across 15 samples, we find peak (average) saturation velocity of 3.6x10^7 cm/s (1.7x10^7 cm/s), and peak…

介观与纳米尺度物理 · 物理学 2013-12-02 Vincent E. Dorgan , Ashkan Behnam , Hiram J. Conley , Kirill I. Bolotin , Eric Pop

Interfaces play an essential role in phonon-mediated heat conduction in solids, impacting applications ranging from thermoelectric waste heat recovery to heat dissipation in electronics. From the microscopic perspective, interfacial phonon…

介观与纳米尺度物理 · 物理学 2017-05-24 Chengyun Hua , Xiangwen Chen , Navaneetha K. Ravichandran , Austin J. Minnich

By using non-equilibrium molecular dynamics simulations(NEMD), the modulation on temperature dependence of thermal conductivity of graphene phononic crystals (GPnCs) are investigated. It is found that the temperature dependence of thermal…

介观与纳米尺度物理 · 物理学 2016-06-22 Shiqian Hu , Meng An , Nuo Yang , Baowen Li

We investigated theoretically the phonon thermal conductivity of single layer graphene. The phonon dispersion for all polarizations and crystallographic directions in graphene lattice was obtained using the valence-force field method. The…

材料科学 · 物理学 2009-04-08 D. L. Nika , E. P. Pokatilov , A. S. Askerov , A. A. Balandin

Using equilibrium and non-equilibrium molecular dynamic (MD) simulations, we found that engineering the strain on the graphene planes forming a channel can drastically change the interfacial friction of water transport through it. There is…

流体动力学 · 物理学 2011-12-23 Wei Xiong , Jefferson Zhe Liu , Ming Ma , Zhiping Xu , John Sheridan , Quanshui Zheng

Two-dimensional (2D) materials have attracted significant interest due to their tunable physical properties when stacked into homo- and hetero-structures. Twisting adjacent layers introduces moir\'{e} patterns that strongly influence the…

Understanding the energy transport by charge carriers and phonons in two-dimensional (2D) van der Waals heterostructures is essential for the development of future energy-efficient 2D nanoelectronics. Here, we performed in situ spatially…

介观与纳米尺度物理 · 物理学 2017-11-21 Daehee Kim , Hanul Kim , Wan Soo Yun , Kenji Watanabe , Takashi Taniguchi , Heesuk Rho , Myung-Ho Bae

The author reports an experimental study of electrical and thermal transport in reduced graphene oxide (RGO)/polystyrene (PS) composites. The electrical conductivity ($\sigma$) of RGO/PS composites with different RGO concentrations at room…

材料科学 · 物理学 2017-02-28 Wonjun Park , Jiuning Hu , Luis A. Jauregui , Xiulin Ruan , Yong P. Chen

Self-heating is a severe problem for high-power GaN electronic and optoelectronic devices. Various thermal management solutions, e.g. flip-chip bonding or composite substrates have been attempted. However, temperature rise still limits…

材料科学 · 物理学 2015-06-04 Zhong Yan , Guanxiong Liu , Javed M. Khan , Alexander A. Balandin

Thin layers of black phosphorus present an ideal combination of a 2D material with a tunable direct bandgap and high carrier mobility. However the material suffers from degradation in ambient conditions due to an oxidation reaction which…

We report on the thermal and electrical properties of hybrid epoxy composites with graphene and boron nitride fillers. The thicknesses, lateral dimensions, and aspect ratios of each filler material were intentionally selected for geometric…

Thermal radiation can be substantially enhanced in the near-field scenario due to the tunneling of evanescent waves. The monolayer graphene could play a vital role in this process owning to its strong infrared plasmonic response, however,…

光学 · 物理学 2018-10-05 Jiang Yang , Yishu Su , Yang Fu , Shaoxiang Gong , Wei Du , Sailing He , Yungui Ma

A strategy to overcome sluggish hydrogenation/dehydrogenation of magnesium is demonstrated by creating magnesium-graphene interphase boundaries via high-pressure torsion (HPT). HPT reduces the grain size of pure magnesium from 1 mm to 850…

In this study, a newly pillared black phosphorene hybrid nanostructures (PBP) is constructed with its thermal stability as well as thermal conductivity are studied by performing equilibrium molecular dynamics simulation (EMD). The results…

介观与纳米尺度物理 · 物理学 2020-10-23 Jiaxin Wu , Suxin Chen , Changpeng Chen , Yihan Ma , Yongshang Tian

Graphane and graphene are both two-dimensional materials but of different bonding configurations, which can result in distinct thermal conduction properties. We simulate thermal conduction in graphane nanoribbons (GANRs) using the…

介观与纳米尺度物理 · 物理学 2015-06-18 Dengfeng Li , Yong Xu , Xiaobin Chen , Bolin Li , Wenhui Duan

Among its many outstanding properties, graphene supports terahertz surface plasma waves -- sub-wavelength charge density oscillations connected with electromagnetic fields that are tightly localized near the surface[1,2]. When these waves…

In this work, electrically and thermally conductive poly (butylene terephthalate) nanocomposites were prepared by in-situ ring-opening polymerization of cyclic butylene terephthalate (CBT) in presence of a tin-based catalyst. One type of…

材料科学 · 物理学 2016-10-28 S. Colonna , O. Monticelli , J. Gomez , C. Novara , G. Saracco , A. Fina

The ability to transport energy is a fundamental property of the two-dimensional Dirac fermions in graphene. Electronic thermal transport in this system is relatively unexplored and is expected to show unique fundamental properties and to…

介观与纳米尺度物理 · 物理学 2013-08-13 K. C. Fong , Emma Wollman , Harish Ravi , Wei Chen , Aash Clerk , M. D. Shaw , H. G. LeDuc , K. C. Schwab

We demonstrated that chemical vapor deposition of graphene on Cu films strongly enhances their thermal diffusivity and thermal conductivity. Deposition of graphene increases the thermal conductivity of 9 micrometer (25 micrometer) thick Cu…

We numerically investigate thermal transport at solid-solid interfaces with graded intermediate layers whose masses vary exponentially from one side to the other. Using Non-Equilibrium Green's Function and Non-Equilibrium Molecular Dynamics…

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