Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles

doi:10.1088/1674-1056/20/5/056501

中国物理B ›› 2011, Vol. 20 ›› Issue (5): 56501-056501.doi: 10.1088/1674-1056/20/5/056501

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles

缪婷婷, 宋梦譞, 马维刚, 张兴

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

收稿日期:2010-09-20 修回日期:2010-10-28 出版日期:2011-05-15 发布日期:2011-05-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50730006 and 50976053).

Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles

Miao Ting-Ting (缪婷婷), Song Meng-Xuan (宋梦譞), Ma Wei-Gang (马维刚), Zhang Xing (张兴)

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

Received:2010-09-20 Revised:2010-10-28 Online:2011-05-15 Published:2011-05-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50730006 and 50976053).

摘要/Abstract

摘要： Carbon nanotube bundles are promising thermal interfacial materials due to their excellent thermal and mechanical characteristics. In this study, the phonon dispersion relations and density of states of the single-wall carbon nanotube bundles are calculated by using the force constant model. The calculation results show that the inter-tube interaction leads to a significant frequency raise of the low frequency modes. To verify the applied calculation method, the specific heat of a single single-wall carbon nanotube is calculated first based on the obtained phonon dispersion relations and the results coincide well with the experimental data. Moreover, the specific heat of the bundles is calculated and exhibits a slight reduction at low temperatures in comparison with that of the single tube. The thermal conductivity of the bundles at low temperatures is calculated by using the ballistic transport model. The calculation results indicate that the inter-tube interaction, i.e. van der Waals interaction, hinders heat transfer and cannot be neglected at extremely low temperatures. For (5, 5) bundles, the relative difference of the thermal conductivity caused by ignoring inter-tube effect reaches the maximum value of 26% around 17 K, which indicates the significant inter-tube interaction effect on the thermal conductivity at low temperatures.

Abstract: Carbon nanotube bundles are promising thermal interfacial materials due to their excellent thermal and mechanical characteristics. In this study, the phonon dispersion relations and density of states of the single-wall carbon nanotube bundles are calculated by using the force constant model. The calculation results show that the inter-tube interaction leads to a significant frequency raise of the low frequency modes. To verify the applied calculation method, the specific heat of a single single-wall carbon nanotube is calculated first based on the obtained phonon dispersion relations and the results coincide well with the experimental data. Moreover, the specific heat of the bundles is calculated and exhibits a slight reduction at low temperatures in comparison with that of the single tube. The thermal conductivity of the bundles at low temperatures is calculated by using the ballistic transport model. The calculation results indicate that the inter-tube interaction, i.e. van der Waals interaction, hinders heat transfer and cannot be neglected at extremely low temperatures. For (5, 5) bundles, the relative difference of the thermal conductivity caused by ignoring inter-tube effect reaches the maximum value of 26% around 17 K, which indicates the significant inter-tube interaction effect on the thermal conductivity at low temperatures.

Key words: single-wall carbon nanotube bundles, van der Waals interaction, specific heat, thermal conductivity

中图分类号: (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)

65.80.-g

63.22.Gh (Nanotubes and nanowires) 61.48.De (Structure of carbon nanotubes, boron nanotubes, and other related systems) 34.20.Cf (Interatomic potentials and forces)

缪婷婷, 宋梦譞, 马维刚, 张兴. Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles[J]. 中国物理B, 2011, 20(5): 56501-056501.

Miao Ting-Ting (缪婷婷), Song Meng-Xuan (宋梦譞), Ma Wei-Gang (马维刚), Zhang Xing (张兴). Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles[J]. Chin. Phys. B, 2011, 20(5): 56501-056501.

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Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles

Theoretical calculations of thermophysical properties of single-wall carbon nanotube bundles

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