Because of surface and grain boundary scattering, the metallic nanofilms exhibit different thermal and electrical properties compared with bulk metals. In this paper, several gold nanofilms with different thicknesses (20~54 nm) at different temperatures (100~340 K) are studied in experiment. The measured results show that the electrical and thermal conductivities of the nanofilms decrease greatly compared with the corresponding bulk value. However, the electrical conductivity drop is considerably greater than the thermal drop. It leads to the Lorentz number of film larger than that in bulk. Both the thermal and electrical conductivities decrease as the films become thinner, and as the temperature increase, both of them increase. It is different from bulk to thermal conductivity while is consistent to electrical. However, the electrical conductivity of film is less sensitive to temperature. It leads to the resistance temperature coefficient is smaller than in bulk.
|Number of pages||3|
|Journal||Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics|
|Publication status||Published - Nov 2009|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering