Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite

Machida, Yo; Matsumoto, Nayuta; Isono, T.; Behnia, Kamran

doi:10.1126/science.aaz8043

Cited by 135 publications

(95 citation statements)

References 37 publications

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“…9 . v u is about twice as large as v in diamond, the highest speed of sound measured at ambient conditions [the in-plane speed of sound in graphite is slightly above v in diamond ( 10 )].…”

Section: Resultsmentioning

confidence: 99%

“…We support this result with a large set of experimental data for different systems and the firstprinciples modeling of atomic hydrogen. Identifying and understanding bounds on physical properties is important from the point of view of fundamental physics, predictions for theory and experiment, and searching for and rationalizing universal behavior [see, e.g., (3)(4)(5)(6)(7)(8)(9)(10)(11)]. Properties for which bounds were recently discussed include viscosity and diffusivity.…”

Section: Introductionmentioning

confidence: 99%

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Speed of sound from fundamental physical constants

et al. 2020

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Two dimensionless fundamental physical constants, the fine structure constant α and the proton-to-electron mass ratio mpme, are attributed a particular importance from the point of view of nuclear synthesis, formation of heavy elements, planets, and life-supporting structures. Here, we show that a combination of these two constants results in a new dimensionless constant that provides the upper bound for the speed of sound in condensed phases, vu. We find that vuc=α(me2mp)12, where c is the speed of light in vacuum. We support this result by a large set of experimental data and first-principles computations for atomic hydrogen. Our result expands the current understanding of how fundamental constants can impose new bounds on important physical properties.

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“…9 . v u is about twice as large as v in diamond, the highest speed of sound measured at ambient conditions [the in-plane speed of sound in graphite is slightly above v in diamond ( 10 )].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Speed of sound from fundamental physical constants

et al. 2020

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“…Recently, using the iterative BTE method, (Lee et al, 2015a) found that there is an obvious hydrodynamic phonon transport in graphene over a wide temperature range due to the presence of strong N scattering processes. Subsequently, (Machida et al, 2020) experimentally showed an extremely high thermal conductivity in the very thin graphite samples (8.5-micrometer-thick) at higher temperature, which extends the hydrodynamic regime from cryogenic to room temperatures. That is, there are three phonon transport behaviors, namely ballistic, diffusive and hydrodynamic transport.…”

Section: Graphenementioning

confidence: 89%

Thermal Transport in Two-Dimensional Heterostructures

2020

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Heterostructures based on two-dimensional (2D) materials have attracted intense attention in recent decades due to their unusual and tunable physics/chemical properties, which can be converted into promising engineering applications ranging from electronics, photonics, and phononics to energy recovery. A fundamental understanding of thermal transport in 2D heterostructures is crucial importance for developing micro-nano devices based on them. In this review, we summarized the recent advances of thermal transport in 2D heterostructures. Firstly, we introduced diverse theoretical approaches and experimental techniques for thermal transport in low-dimensional materials. Then we briefly reviewed the thermal properties of various 2D single-phase materials beyond graphene such as hexagonal boron nitride (h-BN), phosphorene, transition metal dichalcogenides (TMDs) and borophene, and emphatically discussed various influencing factors including structural defects, mechanical strain, and substrate interactions. Moreover, we highlighted thermal conduction control in tailored nanosystems—2D heterostructures and presented the associated underlying physical mechanisms, especially interface-modulated phonon dynamics. Finally, we outline their significant applications in advanced thermal management and thermoelectrics conversion, and discuss a number of open problems on thermal transport in 2D heterostructures.

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“…In principle, the larger the ordered crystalline domain holds, the better the performance of fibers should be, approaching the extreme case of single‐crystalline graphite whiskers. [ 12,13 ] The central mission in fabricating qualified GFs is to fashion graphene sheets into a highly crystalline order with giant and aligned crystallites. Notably, improper microstructures, like incompact stack of graphene and misaligned arrangement, still prevail in previously reported GFs, and bring poor crystallization and thus limited properties.…”

Section: Introductionmentioning

confidence: 99%

Highly Crystalline Graphene Fibers with Superior Strength and Conductivities by Plasticization Spinning

Peng

Liu

Shi

et al. 2020

Adv Funct Materials

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Graphene fiber (GF), a macroscopic one-dimensional assembly of individual graphene sheets, promises both extraordinary mechanical performance and superior multifunctionality. However, the properties of graphene fiber are still limited due to the unfavorable crystalline structures, especially induced by wrinkled conformations of graphene. A plasticization spinning strategy is presented to achieve GF with both high mechanical strength and electrical/ thermal conductivity. Adjusting the interlayer space from 1.2 to 1.8 nm by intercalating proper plasticizers to adjacent graphene oxide sheets enables graphene oxide fibers to achieve a 580% enhanced deformable plasticity. Such a plasticization spinning flattens random graphene wrinkles, and regulates sheets with high order and stacking density, thereby forming large crystallite domains. The GF exhibits all around record performance including mechanical strength (3.4 GPa), electrical conductivity (1.19 × 10 6 S m −1), and thermal conductivity (1480 W m −1 K −1). The optimally crystalline GF with the integration of benchmark overall properties and scalable fabrication is likely to be attractive and competitive in future industrial applications.

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Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite

Cited by 135 publications

References 37 publications

Speed of sound from fundamental physical constants

Speed of sound from fundamental physical constants

Thermal Transport in Two-Dimensional Heterostructures

Highly Crystalline Graphene Fibers with Superior Strength and Conductivities by Plasticization Spinning

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