气候变化领域集成服务门户(CCPortal): Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite

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DOI	10.1126/science.aaz8043
	Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite
	Machida Y.; Matsumoto N.; Isono T.; Behnia K.
发表日期	2020
ISSN	0036-8075
起始页码	309
结束页码	312
卷号	367 期号:6475
英文摘要	Allotropes of carbon, such as diamond and graphene, are among the best conductors of heat. We monitored the evolution of thermal conductivity in thin graphite as a function of temperature and thickness and found an intimate link between high conductivity, thickness, and phonon hydrodynamics. The room-temperature in-plane thermal conductivity of 8.5-micrometer-thick graphite was 4300 watts per meter-kelvin—a value well above that for diamond and slightly larger than in isotopically purified graphene. Warming enhances thermal diffusivity across a wide temperature range, supporting partially hydrodynamic phonon flow. The enhancement of thermal conductivity that we observed with decreasing thickness points to a correlation between the out-of-plane momentum of phonons and the fraction of momentum-relaxing collisions. We argue that this is due to the extreme phonon dispersion anisotropy in graphite. © 2020 American Association for the Advancement of Science. All rights reserved.
关键词	diamond graphene graphite phosphorus anisotropy correlation diamond diffusivity graphite hydrodynamics momentum thermal conductivity anisotropy Article controlled study correlation analysis hydrodynamics momentum phonon physical parameters priority journal room temperature temperature thermal conductivity thermal diffusivity thickness
语种	英语
来源机构	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133784
推荐引用方式 GB/T 7714	Machida Y.,Matsumoto N.,Isono T.,等. Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite[J]. Science,2020,367(6475).
APA	Machida Y.,Matsumoto N.,Isono T.,&Behnia K..(2020).Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite.,367(6475).
MLA	Machida Y.,et al."Phonon hydrodynamics and ultrahigh–room-temperature thermal conductivity in thin graphite".367.6475(2020).