Aligned Carbon Nanotube Arrays Bonded to Solid Graphite Substrates: Thermal Analysis for Future Device Cooling Applications
Aligned Carbon Nanotube Arrays Bonded to Solid Graphite Substrates: Thermal Analysis for Future Device Cooling Applications
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DOI：
10.3390/c4020028
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发表时间：
2018-05
期刊：
影响因子：
64.5
通讯作者：
Betty T. Quinton;Levi J. Elston;J. Scofield;S. Mukhopadhyay
中科院分区：
文献类型：
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作者：
Betty T. Quinton;Levi J. Elston;J. Scofield;S. Mukhopadhyay
碳纳米管（CNT）以高导热性而闻名，并且具有作为纳米散热器或热交换器的潜在用途。本文重点研究了在固体石墨基底上的垂直排列的碳纳米管地毯状阵列的热性能，其想法是研究它们作为地毯尺寸的函数的行为，并预测它们作为电子设备冷却的热界面材料（TIM）的性能。垂直排列的碳纳米管生长在高取向热解石墨（HOPG）衬底，这创造了一个强大的和持久的全碳层次结构。使用Netzsch激光闪光分析系统的多层热分析方法用于评估它们作为地毯高度的函数的性能，由此可以确定它们的热性能。可以看出，CNT阵列的热阻随CNT毯高度线性变化，提供了将CNT毯的性质与其界面解耦的独特方式。该数据用于估计该地毯中单个多壁纳米管束的热导率，其为约35 W/m-K。碳纳米管地毯的参数（空气密度，直径和长度）的热阻的碳纳米管地毯和其潜在的优势和局限性作为一个集成的TIM的影响进行了讨论。
Carbon nanotubes (CNTs) are known for high thermal conductivity and have potential use as nano-radiators or heat exchangers. This paper focuses on the thermal performance of carpet-like arrays of vertically aligned CNTs on solid graphite substrates with the idea of investigating their behavior as a function of carpet dimensions and predicting their performance as thermal interface material (TIM) for electronic device cooling. Vertically aligned CNTs were grown on highly oriented pyrolytic graphite (HOPG) substrate, which creates a robust and durable all-carbon hierarchical structure. The multi-layer thermal analysis approach using Netzsch laser flash analysis system was used to evaluate their performance as a function of carpet height, from which their thermal properties can be determined. It was seen that the thermal resistance of the CNT array varies linearly with CNT carpet height, providing a unique way of decoupling the properties of the CNT carpet from its interface. This data was used to estimate the thermal conductivity of individual multi-walled nanotube strands in this carpet, which was about 35 W/m-K. The influence of CNT carpet parameters (aerial density, diameter, and length) on thermal resistance of the CNT carpet and its potential advantages and limitations as an integrated TIM are discussed.