Thermal conductivity of carbon nanotube superlattices:Comparative study with defective carbon nanotubes

• 来源期刊: 中国物理B（英文版）
• 关键词: thermal conductivity carbon nanotube superlattices defective carbon nanotubes phonon coherent resonance
• 年，卷（期）: 2018,（2）
• 页码范围: 492-495
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/2/026501

摘要

We use molecular dynamics simulation to calculate the thermal conductivities of (5,5) carbon nanotube superlattices (CNTSLs) and defective carbon nanotubes (DCNTs),where CNTSLs and DCNTs have the same size.It is found that the thermal conductivity of DCNT is lower than that of CNTSL at the same concentration of Stone-Wales (SW) defects.We perform the analysis of heat current autocorrelation functions and observe the phonon coherent resonance in CNTSLs,but do not observe the same effect in DCNTs.The phonon vibrational eigen-mode analysis reveals that all modes of phonons are strongly localized by SW defects.The degree of localization of CNTSLs is lower than that of DCNTs,because the phonon coherent resonance results in the phonon tunneling effect in the longitudinal phonon mode.The results are helpful in understanding and tuning the thermal conductivity of carbon nanotubes by defect engineering.