Unprecedently low thermal conductivity of unique tellurium nanoribbons
Unprecedently low thermal conductivity of unique tellurium nanoribbons
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DOI：
10.1007/s12274-021-3414-7
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发表时间：
2021-04-08
期刊：
影响因子：
9.9
通讯作者：
Xu, Xiangfan
中科院分区：
文献类型：
--
作者：
Wu, Xiangshui;Tao, Qiqi;Xu, Xiangfan
碲烯具有超低的热导率，是目前最有前途的二维热电材料之一。然而，在这项研究中，独特的碲纳米带的线性厚度相关的热导率表明，前所未有的低热导率可以通过定义良好的低维碲纳米结构来实现，而不是追求降维的2D碲。对于厚度为144 nm的最薄的碲纳米颗粒，室温下的热导率仅为1.88 +/- 0.22 W.m（-1）.K-1。R的一个显着的下降（45%），与退火良好的高纯碲体相比。更具体地说，预期的碲纳米带的热导率甚至低于2D碲，作为强声子表面散射的结果。我们对低维碲材料有信心，在低维碲材料的热电性能方面可以实现进一步的突破。
Tellurene, probably one of the most promising two-dimensional (2D) system in the thermoelectric materials, displays ultra-low thermal conductivity. However, a linear thickness-dependent thermal conductivity of unique tellurium nanoribbons in this study reveals that unprecedently low thermal conductivity can be achieved via well-defined nanostructures of low-dimensional tellurium instead of pursuing dimension-reduced 2D tellurene. For thinnest tellurium nanoribbon with thickness of 144 nm, the thermal conductivity is only similar to 1.88 +/- 0.22 W.m(-1).K-1 at room temperature. R's a dramatic decrease (45%), compared with the well-annealed high-purity bulk tellurium. To be more specific, an expected thermal conductivity of tellurium nanoribbons is even lower than that of 2D tellurene, as a result of strong phonon-surface scattering. We have faith in low-dimensional tellurium in which the thermoelectric performance could realize further breakthrough.