中国物理B ›› 2020, Vol. 29 ›› Issue (8): 84402-084402.doi: 10.1088/1674-1056/ab90f0

所属专题： SPECIAL TOPIC — Phononics and phonon engineering

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Scaling behavior of thermal conductivity in single-crystalline α-Fe2O3 nanowires

Qilang Wang(王啟浪), Yunyu Chen(陈允玉), Adili Aiyiti(阿地力·艾依提), Minrui Zheng(郑敏锐), Nianbei Li(李念北), Xiangfan Xu(徐象繁)   

  1. 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
  • 收稿日期:2020-03-25 修回日期:2020-04-30 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Nianbei Li, Nianbei Li E-mail:nbli@hqu.edu.cn;xuxiangfan@tongji.edu.cn
  • 基金资助:
    Project supported by 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), and the Open Fund of Zhejiang Provincial Key Laboratory of Quantum Technology and Device, China (Grant No. 20190301), and the Shanghai Committee of Science and Technology in China (Grant Nos. 17142202100, 17ZR1447900, and 17ZR1432600).

Scaling behavior of thermal conductivity in single-crystalline α-Fe2O3 nanowires

Qilang Wang(王啟浪)1, Yunyu Chen(陈允玉)2, Adili Aiyiti(阿地力·艾依提)1, Minrui Zheng(郑敏锐)3, Nianbei Li(李念北)4, Xiangfan Xu(徐象繁)1   

  1. 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
  • Received:2020-03-25 Revised:2020-04-30 Online:2020-08-05 Published:2020-08-05
  • Contact: Nianbei Li, Nianbei Li E-mail:nbli@hqu.edu.cn;xuxiangfan@tongji.edu.cn
  • Supported by:
    Project supported by 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), and the Open Fund of Zhejiang Provincial Key Laboratory of Quantum Technology and Device, China (Grant No. 20190301), and the Shanghai Committee of Science and Technology in China (Grant Nos. 17142202100, 17ZR1447900, and 17ZR1432600).

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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 crystalline α-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 4.84 μm to 20.73 μm. 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 of α-Fe2O3 nanowires although rigorous calculations are needed to confirm the result.

关键词: thermal conductivity, size-dependent, boundary scattering, nanowire

Abstract: 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 crystalline α-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 4.84 μm to 20.73 μm. 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 of α-Fe2O3 nanowires although rigorous calculations are needed to confirm the result.

Key words: thermal conductivity, size-dependent, boundary scattering, nanowire

中图分类号:  (Heat conduction)

  • 44.10.+i
63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials) 63.20.-e (Phonons in crystal lattices)