Thermal transport in nanocrystalline materials

Zhong, Zhanrong; Wang, Xinwei

doi:10.1063/1.2266206

Cited by 22 publications

(7 citation statements)

References 25 publications

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“…In the literature, a large number of theoretical works have studied the conduction of heat in single crystalline thin films [8][9][10][11][12][13][14][15] but less work has been performed to understand heat transport in nano-structured polycrystalline materials. 6,[16][17][18][19][20] The understanding and control of thermal energy transport in highly efficient microelectronic devices and thermoelectric materials requires the development of theoretical approaches that can accurately describe the transport of phonons in polycrystalline semiconductor materials.…”

Section: Introductionmentioning

confidence: 99%

Thermal energy transport model for macro-to-nanograin polycrystalline semiconductors

Maldovan¹

2011

Journal of Applied Physics

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Effective thermal conductivity of graphene-based composites Appl. Phys. Lett. 101, 121916 (2012) Assessment of phonon boundary scattering from light scattering standpoint J. Appl. Phys. 112, 063513 (2012) Visible photoluminescence in polycrystalline terbium doped aluminum nitride (Tb:AlN) ceramics with high thermal conductivity Appl. Phys. Lett. 101, 111903 (2012) Enhanced thermal conductivity of polycrystalline aluminum nitride thin films by optimizing the interface structure Understanding thermal energy transport in polycrystalline semiconductors is important for the efficiency of electronic devices and thermoelectric materials. In this paper, we study the reduction of the transport of thermal energy in polycrystalline semiconductors generated by the shortening of the phonon mean free paths due to grain boundary scattering. We calculate the reduction of the thermal conductivity in polycrystals, from macro-to-nanograin sizes and different temperatures, by using a theoretical approach based on the kinetic theory of transport processes. The approach involves an exact expression for the reduction of the phonon mean free paths that includes their directional, frequency, and polarization dependence. By comparing the results of our model for the reduced thermal conductivity of the grain against the thermal boundary Kapitza resistance calculated by others, we find that the thermal conductivity of polycrystalline Si and SiC materials is dominated by the reduced thermal conductivity of the grain. We also show that in order to accurately calculate the thermal conductivity, the proportion of heat transported by transverse and longitudinal phonons must be correctly taken into account. By using the model, we study grain boundary scattering effects on the reduction of the thermal conductivity of polycrystalline silicon and silicon carbide. The calculated results are compared with experiments at different temperatures and grain sizes without using free adjustable variables (e.g., defects concentration) or phenomenological formulas to account for the reduced thermal conductivity of the grain.

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Section: Introductionmentioning

confidence: 99%

Thermal energy transport model for macro-to-nanograin polycrystalline semiconductors

Maldovan¹

2011

Journal of Applied Physics

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“…Researchers are making an effort to advance MD simulation on the thermal conductivity of polycrystal solids by direct MD simulation with more realistic polycrystalline structure and have made some progresses. [16][17][18][19][20]22 Kumar and Singh 16 generated the microstructures of polycrystalline materials consisting of grains with a random shape and size by the three-dimensional Poisson-Voronoi tessellation method and then calculated the effective thermal conductivity of homogeneous and isotropic noncubic polycrystalline materials by the finite element method based on the single-crystal thermal conductivity data. They considered the grain boundary effects by assigning appropriate thermal properties to a very thin layer of the finite elements at the boundaries of the grains.…”

Section: Introductionmentioning

confidence: 99%

Out-of-plane thermal conductivity of polycrystalline silicon nanofilm by molecular dynamics simulation

Liang

2011

Journal of Applied Physics

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The out-of-plane thermal conductivity of polycrystalline silicon nanofilm is investigated by molecular dynamics simulation. The polycrystalline silicon nanofilm with a random shape of grains is generated by the three-dimensional Voronoi tessellation method. The out-of-plane thermal conductivity of polycrystalline silicon nanofilm at different temperature, film thickness, and average grain size is calculated by the Muller-Plathe method. The results indicate that the polycrystalline thermal conductivity is lower than that of the bulk single crystal and the single crystal nanofilm of silicon. The out-of-plane thermal conductivity of polycrystalline silicon nanofilm is insensitive to temperature and film thickness that is apparently larger than grain size, but mainly depends on the grain size.

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“…The thermal conductivity Ar ( ) T κ is determined by phonon transport of the heat [25][26][27][28][29]. The contribution of thermal conductivity coefficient of SiO 2 nanoparticle, Since the contribution of nanoparticles to the resultant thermal conductivity of the investigated nanocomposite is negligible, in further analysis we focus exclusively on argon matrix phonons.…”

Section: Resultsmentioning

confidence: 99%

Thermal conductivity of argon-SiO2 cryocrystal nanocomposite

Nikonkov

Stachowiak

Jeżowski

et al. 2016

Low Temperature Physics

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The effective thermal conductivity of samples of cryocrystal nanocomposite obtained from argon and SiO 2 nanopowder was determined in the temperature interval 2-35 K using the steady-state method. The thermal conductivity of crystalline argon with nanoparticles of amorphous silica oxide embedded in its structure shows a weak dependence on particle linear dimension in the interval 5-42 nm. The temperature dependence of the thermal conductivity of the nanocomposites can be well approximated by taking into account only the two mechanisms of heat carrier scattering: phonon-phonon interaction in U-processes and scattering of phonons by dislocations. PACS: 65.60 +a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.; 66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves; 63.20.-e Phonons in crystal lattices.

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Thermal transport in nanocrystalline materials

Cited by 22 publications

References 25 publications

Thermal energy transport model for macro-to-nanograin polycrystalline semiconductors

Thermal energy transport model for macro-to-nanograin polycrystalline semiconductors

Out-of-plane thermal conductivity of polycrystalline silicon nanofilm by molecular dynamics simulation

Thermal conductivity of argon-SiO2 cryocrystal nanocomposite

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