Strong graphene-interlayered carbon nanotube films with high thermal conductivity
Strong graphene-interlayered carbon nanotube films with high thermal conductivity
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高导热性强石墨烯夹层碳纳米管薄膜
DOI：
10.1016/j.carbon.2017.04.005
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发表时间：
2017-07-01
期刊：
影响因子：
10.9
通讯作者：
Li, Qingwen
中科院分区：
文献类型：
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作者：
Hu, Dongmei;Gong, Wenbin;Li, Qingwen
快速增长的柔性和可穿戴电子设备和装置需要热管理材料不仅具有高导热性，而且具有机械鲁棒性的结构柔性。然而，大多数开发的热管理材料相对刚性并且具有低强度。在此，我们报告了一种碳纳米管/石墨烯混合膜，其结合了高热导率（高达1056 W/（mK））、非凡的结构柔性和高机械强度（类似于1 GPa）。这种膜由交替堆叠的对齐的长且薄的碳纳米管片和石墨烯片组成，碳纳米管片提供机械强度和导热性支架，石墨烯片充当高传导性组分。通过在将片材缠绕在旋转心轴上期间将氧化石墨烯片材溶液原位喷涂到对齐的独立式碳纳米管气凝胶片材上，然后进行高温退火来制备混合膜。实验和理论结果表明，杂化膜的缺陷的去除和碳纳米管和石墨烯片之间的共价键合的形成导致改善的热导率和机械强度。这种膜作为定向散热器的应用已经得到证实。(C)2017爱思唯尔有限公司版权所有
Fast growing flexible and wearable electronics and devices require thermal management materials having not only high thermal conductivity but also structural flexibility with mechanical robustness. However, most developed thermal management materials are relatively rigid and have low strength. Herein, we report a carbon nanotube/graphene hybrid film that combines high thermal conductivity (up to 1056 W/(mK)), extraordinary structural flexibility, and high mechanical strength (similar to 1 GPa). Such film consists of alternately stacked aligned, long and thin carbon nanotube sheets, which provide a mechanically strong and thermally conductive scaffold, and graphene sheets, which act as a highly conductive component. The hybrid film was prepared by in-situ spraying graphene oxide sheet solution onto an aligned, freestanding carbon nanotube aerogel sheet during winding the sheet on a rotating mandrel, followed by high-temperature annealing. Experimental and theoretical results suggested that the removal of defects of the hybrid films and the formation of covalent bonding between carbon nanotubes and graphene sheets resulted in improved thermal conductivities and mechanical strength. Application of such film as an orientational heat spreader has been demonstrated. (C) 2017 Elsevier Ltd. All rights reserved.