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Title: Thermal Transport in 2D and 3D Nanoscale Phononic Crystals
Authors: YANG LINA
Keywords: Phononic Crystals, Thermal conductivity, Thermoelectrics, Molecular dynamics, Lattice dynamics, Electrical conductivity
Issue Date: 4-Aug-2014
Citation: YANG LINA (2014-08-04). Thermal Transport in 2D and 3D Nanoscale Phononic Crystals. ScholarBank@NUS Repository.
Abstract: Nanoscale phononic crystals (PnCs) could have very low thermal conductivity, in addition, they have advantages in preserving the electronic properties. This thesis is devoted to investigating the thermal conductivity of two-dimensional (2D) and three-dimensional (3D) nanoscale PnCs and understanding the underlying physical mechanism. Moreover, the electronic properties of nanoscale 3D PnCs with spherical pores are studied. Molecular dynamics method is applied. The simulation results show that nanoscale PnCs have very low thermal conductivity and phononic band gaps exist in the PnCs. The thermal conductivity can be manipulated by changing the period length, porosity, mass ratio, length and temperature. Phonon dispersions of PnCs are greatly suppressed and flattened and phonon modes are strongly localized in PnCs, which can cause the reduction of thermal conductivity. Moreover, the electronic properties are little degraded, which will benefit thermoelectric materials.
Appears in Collections:Ph.D Theses (Open)

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