材料科学
富勒烯
热导率
各向异性
相(物质)
各向同性
凝聚态物理
声子
六角相
单层
化学物理
分子物理学
纳米技术
光学
复合材料
物理
量子力学
作者
Haikuan Dong,Chenyang Cao,Penghua Ying,Zheyong Fan,Ping Qian,Yanjing Su
标识
DOI:10.1016/j.ijheatmasstransfer.2023.123943
摘要
Recently a novel two-dimensional (2D) C60 based crystal called quasi-hexagonal-phase fullerene (QHPF) has been fabricated and demonstrated to be a promising candidate for 2D electronic devices [Hou et al. Nature 606, 507–510 (2022)]. We construct an accurate and transferable machine-learned potential to study heat transport and related properties of this material, with a comparison to the face-centered-cubic bulk-phase fullerene (BPF). Using the homogeneous nonequilibrium molecular dynamics and the related spectral decomposition methods, we show that the thermal conductivity in QHPF is anisotropic, which is 137(7) W/mK at 300 K in the direction parallel to the cycloaddition bonds and 102(3) W/mK in the perpendicular in-plane direction. By contrast, the thermal conductivity in BPF is isotropic and is only 0.45(5) W/mK. We show that the inter-molecular covalent bonding in QHPF plays a crucial role in enhancing the thermal conductivity in QHPF as compared to that in BPF. The heat transport properties as characterized in this work will be useful for the application of QHPF as novel 2D electronic devices.
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