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Z_erO

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[求助] 求下面一段话的翻译。。。。。实在弄不完了 谢谢

Recently study showed that phonon transport within crystalline silicon can be significantly altered when crystalline silicon is confined to the nanometer range. This phenomenon can be explained by various effects such as the increase in boundary scattering, the change of phonon dispersion relation and the quantization of phonon transport [90]. Molecular dynamics simulations show that the thermal conductivities
of nanometer wires could be two orders of magnitude smaller than that of bulk silicon. Li and co-workers have measured thermal conductivities for intrinsic singlecrystalline PSNA of different diameters (22, 37, 56, and 115 nm) shown in Fig. (4a) [10]. Compared to bulk silicon, all the SiNWs have two important features: (i) the measured thermal conductivities are about two orders of magnitude lower than that of the bulk. When the wire diameter is decreased, the corresponding thermal conductivity is reduced. This indicates that enhanced boundary scattering controls
phonon transport in SiNWs; (ii) Thermal conductivities of the 37, 56, and 115 nm diameter wires reach their peak values around 210, 160, and 130 K, respectively. This is in sharp contrast to the peak of bulk Si which occurs at about 25 K. As the wire diameter is reduced, the phonon boundary scattering dominates over phonon-phonon Umklapp scattering, which decreases the thermal conductivity with an increase in temperature.
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