Thermal management function of graphene under cryogenic temperature
Thermal management function of graphene under cryogenic temperature
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DOI：
10.1016/j.carbon.2021.07.077
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发表时间：
2021-10
期刊：
影响因子：
10.9
通讯作者：
R. Kato;Masami Naya;Naoki Kasahata;Ryosuke Senga;C. Sato;M. Koshino;K. Suenaga;M. Hasegawa
中科院分区：
文献类型：
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作者：
R. Kato;Masami Naya;Naoki Kasahata;Ryosuke Senga;C. Sato;M. Koshino;K. Suenaga;M. Hasegawa
配备电子能量损失谱(EELS)的低温透射电子显微镜(Cryo-TEM)证明了高质量石墨烯的热管理功能，该功能有望在低温下实现最大的面内导热系数。在低温电子显微镜下观察到的玻璃体冰，受到电子束的照射，通过升华逐渐变薄。根据EELS测量厚度的时间序列，冰的厚度随有无石墨烯的电子束辐照时间呈指数减小。石墨烯与冰的直接接触通过石墨烯有效地散热了冰，从而显著抑制了升华行为。石墨烯的散热对于较薄的冰而不是较厚的冰是有效的。石墨烯上的冰在电子束辐照下的寿命延长到约40%，与没有石墨烯的相比有了很大的改善。石墨烯为低温电子显微镜分析中的有效热管理提供了一条新的途径。
The thermal management function of high-quality graphene, which is expected to maximize in-plane thermal conductivity at cryogenic temperature, was demonstrated by cryogenic transmission electron microscopy (cryo-TEM) equipped with electron energy loss spectroscopy (EELS). Vitreous ice, observed under the cryo-TEM, suffers from electron beam irradiation, and gradually becomes thinner by sublimation. The ice thickness decreases exponentially with respect to the irradiation time of electron beam with and without graphene, according to the time series of thickness measurement by EELS. Direct contact between graphene and ice effectively dissipates the heat of the ice through graphene, which significantly suppresses the sublimation behavior. The heat dissipation by graphene is effective for thinner ice rather than thicker one. The lifespan of ice on graphene against electron beam irradiation extends to about 40%, showing substantial improvement compared to that without graphene. The graphene provides a new stream for effective thermal management in cryo-TEM analysis.