具有交联网络的碳纳米管阵列导热材料  

Carbon Nanotube Arrays with Cross-Linked Networks for Thermal Conductivity

作　　者：蔡瑜 秦盟盟 封伟[1] CAI Yu;QIN Mengmeng;FENG Wei(School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《功能高分子学报》2022年第6期524-531,共8页Journal of Functional Polymers

摘　　要：垂直碳纳米管阵列(VACNT)中相邻碳纳米管的相互作用较弱,导致其水平热导率较低。通过化学气相沉积法在VACNT内部生长了随机取向的次级碳纳米管,次级碳纳米管在VACNT中形成交联网络,增强了VACNT的水平热导率。理论模拟分析表明,次级碳纳米管能够对集中的热量进行分散传导,从而有效调控碳纳米管阵列沿水平方向的热导率。实际测试结果表明,二次生长时间为30 min的碳纳米管阵列具有较为致密的网络结构,其密度为0.149 g/cm^(3),相比于VACNT的密度(0.118 g/cm^(3))提升了26.3%;其垂直热导率和水平热导率分别高达10.9 W/(m·K)和7.8 W/(m·K),水平热导率比VACNT的水平热导率提升幅度达231.6%。Due to the weak interaction between adjacent carbon nanotubes in vertical carbon nanotube arrays(VACNT),the horizontal thermal conductivity of VACNT is low.To solve this problem,the randomly oriented secondary carbon nanotube was grown inside the carbon nanotube array by chemical vapor deposition method.The secondary carbon nanotube formed a crosslinking network in VACNT,which enhanced the horizontal thermal conductivity of VACNT.Theoretical simulation analysis shows that the secondary carbon nanotubes are able to disperse the heat conduction to the concentrated heat,thus effectively modulating the thermal conductivity of the carbon nanotube arrays along the horizontal direction.The test results show that the carbon nanotube array with a secondary growth time of 30 min has a denser network structure and its density is 0.149 g/cm^(3),which is 26.3%higher than that of VACNT(0.118 g/cm^(3)).Its vertical thermal conductivity and horizontal thermal conductivity are as high as 10.9 W/(m·K)and 7.8 W/(m·K),respectively,and the horizontal thermal conductivity is enhanced by 231.6% compared with that of VACNT.

关 键 词：垂直碳纳米管阵列 网络结构 化学气相沉积法 导热性能 碳纳米管 

分 类 号：TM383.1[电气工程—电机]