采用非平衡态分子动力学(NEMD)方法模拟分析了纳米铂(Pt)薄膜的导热性能与脉冲激光作用下的温度响应特性.结果表明,100～500 nm铂薄膜的法向导热系数比体材料值低很多,而且低于其面向导热系数;微米铂薄膜的温度响应时间在纳秒量级;在脉冲加热的初始阶段,有一快速非傅立叶热波沿铂薄膜的厚度方向传递.
Nonequilibrium molecular dynamics simulations are employed to explore the heat conduction and the temperature response characteristics of a platinum nanofilm.It shows that with the thickness between 100 nm and 500 nm the cross-plane thermal conductivity of platinum nanofilm is much lower than the bulk value,and also lower than the in-plane thermal conductivity. The results also indicate that the temperature response time in platinum film with micrometer thickness is in a nanosecond magnitude.It is also found that at the initial stage of pulse heating,there is a faster Non-Fourier heat wave across the film.
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