CAJ | 학술논문

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.
채용비평형태분자동역학(NEMD)방법모의분석료납미박(Pt)박막적도열성능여맥충격광작용하적온도향응특성.결과표명,100～500 nm박박막적법향도열계수비체재료치저흔다,이차저우기면향도열계수;미미박박막적온도향응시간재납초량급;재맥충가열적초시계단,유일쾌속비부립협열파연박박막적후도방향전체.
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.