Scaling behavior of thermal conductivity in single-crystallineα-Fe2O3 nanowires  

作　　者：Qilang Wang Yunyu Chen Adili Aiyiti Minrui Zheng Nianbei Li Xiangfan Xu 王啟浪;陈允玉;阿地力·艾依提;郑敏锐;李念北;徐象繁(Center for Phononics and Thermal Energy Science,China-EU Joint Center for Nanophononics,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China;The First Affiliated Hospital of Wenzhou Medical University,Wenzhou 325000,China;Department of Electrical and Computer Engineering,Faculty of Engineering,National University of Singapore,4 Engineering Drive 3,Singapore 117583;Institute of Systems Science and Department of Physics,College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China)

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]The First Affiliated Hospital of Wenzhou Medical University,Wenzhou 325000,China [3]Department of Electrical and Computer Engineering,Faculty of Engineering,National University of Singapore,4 Engineering Drive 3,Singapore 117583 [4]Institute of Systems Science and Department of Physics,College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China

出　　处：《Chinese Physics B》2020年第8期96-101,共6页中国物理B（英文版）

基　　金：the Key-Area Research and Development Program of Guangdong Province,China(Grant No.2020B010190004);the National Natural Science Foundation of China(Grant Nos.11674245,11775158,11890703,and 11935010);the Open Fund of Zhejiang Provincial Key Laboratory of Quantum Technology and Device,China(Grant No.20190301);the Shanghai Committee of Science and Technology in China(Grant Nos.17142202100,17ZR1447900,and 17ZR1432600)。

摘　　要：Unveiling the thermal transport properties of various one-dimensional(1D)or quasi-1D materials like nanowires,nanotubes,and nanorods is of great importance both theoretically and experimentally.The dimension or size dependence of thermal conductivity is crucial in understanding the phonon-phonon interaction in the low-dimensional systems.In this paper,we experimentally investigate the size-dependent thermal conductivity of individual single crystallineα-Fe2O3 nanowires collaborating the suspended thermal bridge method and the focused electron-beam self-heating technique,with the sample diameter(d)ranging from 180 nm to 661 nm and length(L)changing from 4.84μm to 20.73μm.An empirical relationship for diameter-/length-dependent thermal conductivity is obtained,which shows an approximately linear dependence on the aspect ratio(L/(1+Cd))at T=300 K,where C is a fitting parameter.This is related to the boundary scattering and diameter effect ofα-Fe2O3 nanowires although rigorous calculations are needed to confirm the result.

关 键 词：thermal conductivity SIZE-DEPENDENT boundary scattering NANOWIRE 

分 类 号：O614.811[理学—无机化学] TB383.1[理学—化学]