Drastically reduced thermal conductivity of self-bundled single-walled carbon nanotube
Drastically reduced thermal conductivity of self-bundled single-walled carbon nanotube
复制标题
自束单壁碳纳米管的热导率大幅降低
DOI：
10.1016/j.carbon.2022.09.024
复制
发表时间：
2023
期刊：
影响因子：
10.9
通讯作者：
Maruyama Shigeo
中科院分区：
文献类型：
--
作者：
Feng Ya;Sato Yuta;Inoue Taiki;Liu Ming;Chiashi Shohei;Xiang Rong;Suenaga Kazu;Maruyama Shigeo
一个单独的单壁碳纳米管在生长过程中掉头并连接在一起，在透射电子显微镜网格上的狭缝上形成了两个明显的悬浮部分：孤立的纳米管和自束纳米管(具有相同手性的三个纳米管束)。这种特殊的构型为研究碳纳米管各种性质的成束效应提供了理想的样品。我们在这里阐述的最显著的影响是这种单独的单壁碳纳米管在自我捆绑后导热系数急剧下降。孤立纳米管的热导率估计为(3−~4)×103Wm−1K−1的量级，但在相同激光功率的加热下，悬浮纳米管的中心温升从150K左右增加到600K左右，导致自束纳米管的导热系数降低了75%以上。
An individual single-walled carbon nanotube was taking U-turns and joining itself during growth, forming two distinguishable suspended sections across the slits on transmission electron microscope grid: the isolated nanotube and the self-bundled nanotube (three-nanotube bundle of the same chirality). This special formation provides the perfect specimen to study the bundling effect on various properties of carbon nanotubes. The most striking effect we elaborate on here is the drastically reduced thermal conductivity of this individual single-walled carbon nanotube after its self-bundling. The estimated thermal conductivity of the isolated nanotube is in the order of (3 − 4) × 103Wm−1K−1, but under the heating of the same laser power, the center temperature rise of the suspended nanotube was increasing from around 150 K to about 600 K, resulting in more than 75% reduction of thermal conductivity of the self-bundled nanotube.