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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Feng, Bo Li, Zhixin Zhang, Xing |
| Copyright Year | 2008 |
| Abstract | A model is developed for in-plane thermal conductivity of nanostructured metallic films based on the kinetic theory, which attributes the reduced thermal conductivity to the reduced mean free path of electrons. The partially inelastic electron-surface scattering and grain-boundary impedance by quantum mechanical treatment are elaborately included. Meanwhile, the mean free path of electrons is also used to study in-plane electrical conductivity of nanofilms. Both electrical conductivity and thermal conductivity, varying with film thickness and temperature, are observed to be lower than corresponding bulk values, agreeing well with the experimental data. The grain-boundary scattering is theoretically found to dominate over surface scattering to enhance the size effect on electrical and thermal conductivities. In addition, the size effect in low temperature appears more dramatic due to larger electron Knudsen number. We further examine the Lorenz number of nanofilms and find the Wiedemann-Franz law is seriously violated. The Coulomb blockade and the neutral excitation of electron-hole pair are used to offer a more detailed picture. Excessive thermal conductivity is also evaluated resorting to concepts in granular metals to show the validity of this account. |
| Sponsorship | Nanotechnology Institute |
| Starting Page | 303 |
| Ending Page | 311 |
| Page Count | 9 |
| File Format | |
| ISBN | 0791842924 |
| DOI | 10.1115/MNHT2008-52009 |
| e-ISBN | 0791838137 |
| Volume Number | ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B |
| Conference Proceedings | ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer |
| Language | English |
| Publisher Date | 2008-06-06 |
| Publisher Place | Tainan, Taiwan |
| Access Restriction | Subscribed |
| Subject Keyword | Thermal conductivity Electrical conductivity Polycrystalline metallic nanofilms Grain-boundary scattering Grain boundaries Radiation scattering Temperature Scattering (physics) Mean free path Metals Electrical resistance Film thickness Excitons Knudsen number Electromagnetic scattering Size effect Metallic films Wiedemann-franz law Kinetic theory Excitation Electrons Low temperature |
| Content Type | Text |
| Resource Type | Article |
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