Department of Physics, Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligent Systems, Huaiyin Normal University, Huai'an, People's Republic of China.
Nanoscale. 2019 Mar 7;11(10):4248-4257. doi: 10.1039/c8nr08493a.
Diamane, a chemically derived two-dimensional material, shows many superior physical and chemical properties similar to diamond thin films. Through the Peierls-Boltzmann transport equation, we reveal giant thermal conductivity in diamane with a stacking order of both AB and AA (respectively, abbreviated as D-AB and D-AA, hereafter) which are both comparable to that of diamond. Like in graphene, the phonon transport falls into the hydrodynamic regime even at room temperature, and the major contribution to the total thermal conductivity comes from the out-of-plane acoustic phonon modes (>40%). In addition, the thermal conductivity shows a dependence on the stacking order, namely, the thermal conductivity of D-AA, ∼2240 W m-1 K-1 at 300 K, is around 15% larger than that of D-AB, which is due to the strong restriction on the phonon scattering phase space induced by the horizontal reflection symmetry in D-AA. Such a kind of restriction, not limited to single atomic plane systems, is a general feature in two-dimensional materials with a horizontal reflection symmetry.
类金刚石，一种化学衍生的二维材料，具有许多类似于金刚石薄膜的优越物理和化学性质。通过佩尔斯-玻尔兹曼输运方程，我们揭示了具有 AB 和 AA 堆叠顺序的类金刚石（分别缩写为 D-AB 和 D-AA，以下简称）的巨大热导率，与金刚石相当。与石墨烯一样，即使在室温下，声子输运也落入流体动力学区，并且总热导率的主要贡献来自于面外声学声子模式（>40%）。此外，热导率表现出对堆叠顺序的依赖性，即 300 K 时 D-AA 的热导率约为 2240 W m-1 K-1，比 D-AB 大约 15%，这是由于 D-AA 中的水平反射对称性对声子散射相空间的强烈限制所致。这种限制不仅限于单个原子层系统，而是具有水平反射对称性的二维材料的一般特征。
