Unprecedently low thermal conductivity of unique tellurium nanoribbons  

作　　者：Xiangshui Wu Qiqi Tao Da Li Qilang Wang Xiaoyan Zhang Huile Jin Jun Li Shun Wang Xiangfan Xu 

机构地区：[1]Center for Phononics and Thermal Energy Science,China-EU Joint Center for Nanophononics,School of Physics Science and Engineering,Tongji University,Shanghai,200092,China [2]College of Chemistry and Materials Engineering,Institute of New Materials and Industrial Technologies,Wenzhou University,Wenzhou,325035,China

出　　处：《Nano Research》2021年第12期4725-4731,共7页纳米研究（英文版）

基　　金：The work was supported by the Key-Area Research and Development Program of Guangdong Province(No.2020B010190004);the National Key R&D Program of China(No.2017YFB0406000);the National Natural Science Foundation of China(Nos.11674245,51772219,11890703,and 11935010);the Open Fund of Zhejiang Provincial Key Laboratory of Quantum Technology and Device(No.20190301);the Zhejiang Provincial Natural Science Foundation of China(No.LZ18E030001).

摘　　要：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∼1.88±0.22 W·m^(−1)·K^(−1) at room temperature.It’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.

关 键 词：tellurium nanoribbons thickness-dependent thermal conductivity linear relationship phonon-surface scattering 

分 类 号：TB383[一般工业技术—材料科学与工程]