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Remarkable Reduction of Thermal Conductivity in Silicon Nanotubes

机译:硅纳米管的导热系数显着降低

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We propose to reduce the thermal conductivity of silicon nanowires (SiNWs) by introducing a small hole at the center, i.e., construct a silicon nanotube (SiNT) structure. Our numerical results demonstrate that a very small hole (only 1% reduction in cross section area) can induce a 35% reduction in room temperature thermal conductivity. Moreover, with the same cross section area, thermal conductivity of SiNT is only about 33% of that of SiNW at room temperature. The spatial distribution of vibrational energy reveals that localization modes are concentrated on the inner and outer surfaces of SiNTs. The enhanced surface-to-volume ratio in SiNTs reduces the percentage of delocalized modes, which is believed to be responsible for the reduction of thermal conductivity. Our study suggests SiNT is a promising thermoelectric material with low thermal conductivity.
机译:我们建议通过在中心引入一个小孔来降低硅纳米线(SiNWs)的导热性,即构造一个硅纳米管(SiNT)结构。我们的数值结果表明,很小的孔(横截面积仅减少1%)可导致室温热导率减少35%。此外,在相同的横截面面积下,SiNT的导热率仅为室温下SiNW的33%左右。振动能量的空间分布表明,定位模式集中在SiNTs的内表面和外表面。 SiNT中提高的表面体积比降低了离域模的百分比,据信这是导致导热系数降低的原因。我们的研究表明,SiNT是一种具有低导热系数的有前途的热电材料。

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