Department of Nano Mechanics, Korea Institute of Machinery and Materials.
Langmuir. 2011 Dec 6;27(23):14532-8. doi: 10.1021/la203007y. Epub 2011 Nov 3.
Using materials with high thermal conductivity is a matter of great concern in the field of thermal management. In this study, we present our experimental results on two-dimensional thermal conductivity of carbon nanotube (CNT) films obtained by using an optical method based on Raman spectroscopy. We use four kinds of CNTs in film preparation to investigate the effect of CNT type on heat spreading performance of CNT films. This first comparative study using the optical method shows that the arc-discharge single-walled carbon nanotubes yield the best heat spreading film. We also show that the Raman method renders reasonable thermal conductivity value as long as the sample is a transparent film by testing CNT films with various transmittance. This study provides useful information on characterization of thermal conduction in transparent CNT films and could be an important step toward high-performance carbon-based heat spreading films.
在热管理领域，使用具有高热导率的材料是一个备受关注的问题。在本研究中，我们通过基于拉曼光谱的光学方法展示了我们关于碳纳米管（CNT）薄膜二维热导率的实验结果。我们使用了四种 CNT 来制备薄膜，以研究 CNT 类型对 CNT 薄膜散热性能的影响。这项首次使用光学方法进行的比较研究表明，电弧放电单壁 CNT 产生了最佳的散热薄膜。我们还通过测试具有不同透光率的 CNT 薄膜证明，只要样品是透明薄膜，拉曼方法就可以给出合理的热导率值。本研究为透明 CNT 薄膜中热传导特性的表征提供了有用的信息，并且可能是制备高性能碳基散热薄膜的重要一步。
