Thermal Conductivity in Nanoporous Gold Films during Electron-Phonon Nonequilibrium
نویسندگان
چکیده
The reduction of nanodevices has given recent attention to nanoporous materials due to their structure and geometry. However, the thermophysical properties of these materials are relatively unknown. In this article, an expression for thermal conductivity of nanoporous structures is derived based on the assumption that the finite size of the ligaments leads to electron-ligament wall scattering. This expression is then used to analyze the thermal conductivity of nanoporous structures in the event of electronphonon nonequilibrium.
منابع مشابه
Substrate influence in electron–phonon coupling measurements in thin Au films
Accurate understanding and measurement of the energy transfer mechanisms during thermal nonequilibrium between electrons and the surrounding material systems is critical for a wide array of applications. With device dimensions decreasing to sizes on the order of the thermal penetration depth, the equilibration of the electrons could be effected by boundary effects in addition to electron–phonon...
متن کاملModeling of Thermoelectric Properties of Semi-Conductor Thin Films With Quantum and Scattering Effects
Several new reduced-scale structures have been proposed to improve thermoelectric properties of materials. In particular, superlattice thin films and wires should decrease the thermal conductivity, due to increased phonon boundary scattering, while increasing the local electron density of states for improved thermopower. The net effect should be increased ZT, the performance metric for thermoel...
متن کاملContribution of Ballistic Electron Transport to Energy Transfer During Electron-Phonon Nonequilibrium in Thin Metal Films
With the ever decreasing characteristic lengths of nanomaterials, nonequilibrium electron-phonon scattering can be affected by additional scattering processes at the interface of two materials. Electron-interface scattering would lead to another path of energy flow for the high-energy electrons other than electron-phonon coupling in a single material. Traditionally, electron-phonon coupling in ...
متن کاملImproved Two-Temperature Model and Its Application in Ultrashort Laser Heating of Metal Films
The two-temperature model has been widely used to predict the electron and phonon temperature distributions in ultrashort laser processing of metals. However, estimations of some important thermal and optical properties in the existing two-temperature model are limited to low laser fluences in which the electron temperatures are much lower than the Fermi temperature. This paper extends the exis...
متن کاملDeviational simulation of phonon transport in graphene ribbons with ab initio scattering
Articles you may be interested in Size and boundary scattering controlled contribution of spectral phonons to the thermal conductivity in graphene ribbons Contribution of d-band electrons to ballistic transport and scattering during electron-phonon nonequilibrium in nanoscale Au films using an ab initio density of states We present a deviational Monte Carlo method for solving the Boltzmann-Peie...
متن کامل