Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China.
Nanotechnology. 2016 Jul 1;27(26):265702. doi: 10.1088/0957-4484/27/26/265702. Epub 2016 May 19.
By using non-equilibrium molecular dynamics simulations, modulating the temperature dependence of thermal conductivity of graphene phononic crystals (GPnCs) is investigated. It is found that the temperature dependence of thermal conductivity of GPnCs follows ∼T (-α) behavior. The power exponents (α) can be efficiently tuned by changing the characteristic size of GPnCs. The phonon participation ratio spectra and dispersion relation reveal that the long-range phonon modes are more affected in GPnCs with larger holes (L 0). Our results suggest that constructing GPnCs is an effective method to manipulate the temperature dependence of thermal conductivity of graphene, which would be beneficial for developing GPnC-based thermal management and signal processing devices.
利用非平衡分子动力学模拟，研究了石墨烯声子晶体（GPnCs）热导率的温度依赖性。结果发现，GPnCs 的热导率随温度的变化遵循∼T（-α）规律。通过改变 GPnCs 的特征尺寸，可以有效地调节功率指数（α）。声子参与比谱和色散关系表明，具有较大孔（L0）的 GPnCs 中长程声模受到的影响更大。我们的结果表明，构建 GPnCs 是控制石墨烯热导率温度依赖性的有效方法，这将有利于开发基于 GPnC 的热管理和信号处理器件。
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