中国物理B ›› 2018, Vol. 27 ›› Issue (8): 88101-088101.doi: 10.1088/1674-1056/27/8/088101

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Modulated thermal transport for flexural and in-plane phonons in double-stub graphene nanoribbons

Chang-Ning Pan(潘长宁), Meng-Qiu Long(龙孟秋), Jun He(何军)   

  1. 1 Hunan Key Laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China;
    2 School of Science, Hunan University of Technology, Zhuzhou 412008, China
  • 收稿日期:2018-02-06 修回日期:2018-05-16 出版日期:2018-08-05 发布日期:2018-08-05
  • 通讯作者: Meng-Qiu Long E-mail:mqlong@csu.edu.cn
  • 基金资助:

    Project supported by the Science Funds from the Educational Bureau of Hunan Province, China (Grant No. 16C0468), the China Postdoctoral Science Foundation (Grant No. 2016M602421), the Science and Technology Plan of Hunan Province, China (Grant No. 2015RS4002), and the Natural Science Foundation of Hunan Province, China (Grant No. 2015JJ2050).

Modulated thermal transport for flexural and in-plane phonons in double-stub graphene nanoribbons

Chang-Ning Pan(潘长宁)1,2, Meng-Qiu Long(龙孟秋)1, Jun He(何军)1   

  1. 1 Hunan Key Laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China;
    2 School of Science, Hunan University of Technology, Zhuzhou 412008, China
  • Received:2018-02-06 Revised:2018-05-16 Online:2018-08-05 Published:2018-08-05
  • Contact: Meng-Qiu Long E-mail:mqlong@csu.edu.cn
  • Supported by:

    Project supported by the Science Funds from the Educational Bureau of Hunan Province, China (Grant No. 16C0468), the China Postdoctoral Science Foundation (Grant No. 2016M602421), the Science and Technology Plan of Hunan Province, China (Grant No. 2015RS4002), and the Natural Science Foundation of Hunan Province, China (Grant No. 2015JJ2050).

摘要:

Thermal transport properties are investigated for out-of-plane phonon modes (FPMs) and in-plane phonon modes (IPMs) in double-stub graphene nanoribbons (GNRs). The results show that the quantized thermal conductance plateau of FPMs is narrower and more easily broken by the double-stub structure. In the straight GNRs, the thermal conductance of FPMs is higher in the low temperature region due to there being less cut-off frequency and more low-frequency excited modes. In contrast, the thermal conductance of IPMs is higher in the high temperature region because of the wider phonon energy spectrum. Furthermore, the thermal transport of two types of phonon modes can be modulated by the double-stub GNRs, the thermal conductance of FPMs is less than that of IPMs in the low temperatures, but it dominates the contribution to the total thermal conductance in the high temperatures. The modulated thermal conductance can provide a guideline for designing high-performance thermal or thermoelectric nanodevices based on graphene.

关键词: graphene nanoribbon, flexural phonons, in-plane phonons, thermoelectric properties

Abstract:

Thermal transport properties are investigated for out-of-plane phonon modes (FPMs) and in-plane phonon modes (IPMs) in double-stub graphene nanoribbons (GNRs). The results show that the quantized thermal conductance plateau of FPMs is narrower and more easily broken by the double-stub structure. In the straight GNRs, the thermal conductance of FPMs is higher in the low temperature region due to there being less cut-off frequency and more low-frequency excited modes. In contrast, the thermal conductance of IPMs is higher in the high temperature region because of the wider phonon energy spectrum. Furthermore, the thermal transport of two types of phonon modes can be modulated by the double-stub GNRs, the thermal conductance of FPMs is less than that of IPMs in the low temperatures, but it dominates the contribution to the total thermal conductance in the high temperatures. The modulated thermal conductance can provide a guideline for designing high-performance thermal or thermoelectric nanodevices based on graphene.

Key words: graphene nanoribbon, flexural phonons, in-plane phonons, thermoelectric properties

中图分类号:  (Carbon/carbon-based materials)

  • 81.05.U-
73.63.-b (Electronic transport in nanoscale materials and structures) 72.20.Pa (Thermoelectric and thermomagnetic effects)