Two-Dimensional Phonon Transport in Supported Graphene
Two-Dimensional Phonon Transport in Supported Graphene
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DOI：
10.1126/science.1184014
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发表时间：
2010-04-09
期刊：
影响因子：
56.9
通讯作者：
Shi, Li
中科院分区：
文献类型：
--
作者：
Seol, Jae Hun;Jo, Insun;Shi, Li
据报道，悬浮石墨烯的热导率（kappa）为3000至5000瓦/米/开尔文，超过了金刚石和石墨。因此，石墨烯可以用于解决散热问题，例如纳米电子学中的散热问题。然而，与衬底接触可能影响石墨烯的热传输性质。在这里，我们通过实验表明，在二氧化硅载体上剥离的单层石墨烯的k在室温附近仍然高达约600瓦/米/开尔文，超过了铜等金属的k。它低于悬浮石墨烯，因为声子泄漏通过石墨烯-支撑界面和弯曲模式的强界面散射，根据理论计算，这对悬浮石墨烯中的k有很大贡献。
The reported thermal conductivity (kappa) of suspended graphene, 3000 to 5000 watts per meter per kelvin, exceeds that of diamond and graphite. Thus, graphene can be useful in solving heat dissipation problems such as those in nanoelectronics. However, contact with a substrate could affect the thermal transport properties of graphene. Here, we show experimentally that k of monolayer graphene exfoliated on a silicon dioxide support is still as high as about 600 watts per meter per kelvin near room temperature, exceeding those of metals such as copper. It is lower than that of suspended graphene because of phonons leaking across the graphene-support interface and strong interface-scattering of flexural modes, which make a large contribution to k in suspended graphene according to a theoretical calculation.