Thermal Conduction in Aligned Carbon Nanotube-Polymer Nanocomposites with High Packing Density
Thermal Conduction in Aligned Carbon Nanotube-Polymer Nanocomposites with High Packing Density
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DOI：
10.1021/nn200847u
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发表时间：
2011-06-01
期刊：
影响因子：
17.1
通讯作者：
Goodson, Kenneth E.
中科院分区：
文献类型：
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作者：
Marconnett, Amy M.;Yamamoto, Namiko;Goodson, Kenneth E.
定向碳纳米管(CNTs)纳米复合材料作为电子系统和热电发电机的界面材料具有广阔的应用前景。我们首次报道了致密的、定向的多壁碳纳米管纳米复合膜在一定范围内碳纳米管体积分数的热导率数据。体积分数为1%的碳纳米管复合材料使基础聚合物的导热系数增加一倍以上。密度较大的碳纳米管阵列(体积分数为17%)使导热系数提高了18倍，且与碳纳米管体积分数呈非线性关系。本文讨论了碳纳米管密度对热传导的影响，考虑了边界电阻、缺陷浓度的增加以及碳纳米管中声子模被抑制的可能性。
Nanostructured composites containing aligned carbon nanotubes (CNTs) are very promising as interface materials for electronic systems and thermoelectric power generators. We report the first data for the thermal conductivity of densified, aligned multiwall CNT nanocomposite films for a range of CNT volume fractions. A 1 vol % CNT composite more than doubles the thermal conductivity of the base polymer. Denser arrays (17 vol % CNTs) enhance the thermal conductivity by as much as a factor of 18 and there is a nonlinear trend with CNT volume fraction. This article discusses the Impact of CNT density on thermal conduction considering boundary resistances, increased defect concentrations, and the possibility of suppressed phonon modes in the CNTs.