| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Nano-Metal Film Thermal Conductivity Measurement by using the Femtosecond Laser Pump and Probe Method |
| ZHU Li-Dan1,2, SUN Fang-Yuan1,2, ZHU Jie1**, TANG Da-Wei1**, LI Yu-Hua1,2, GUO Chao-Hong1 |
1Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190
2Graduate University of Chinese Academy of Sciences, Beijing 100039 |
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ZHU Li-Dan, SUN Fang-Yuan, ZHU Jie et al 2012 Chin. Phys. Lett. 29 066301 |
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Abstract Heat management at nanoscale is a critical issue across many areas of science and engineering, where the size effect of thermal properties plays an important role. We measure the transient thermoreflectance signals of thin metal films with thicknesses from 50 to 200 nm by using the femtosecond laser pump and probe method, and the experimental data are combined with the parabolic two-step model to enable us to measure thermal conductivity of the thin metal films. The measurement results of Ni and Al films show that, in the thickness range from tens to hundreds of nanometer, the thermal conductivity increases with the increasing thicknesses of the films, which agrees well with the previous conclusions.
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Received: 08 February 2012
Published: 31 May 2012
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