Thermal performance of vertically-aligned multi-walled carbon nanotube array grown on platinum film |
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| Affiliation: | 1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;2. Department of Thermal Energy Engineering, College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China;3. World Premier International Research Center International Institute for Carbon-Neutral Energy Research, Kyushu University, Fukuoka 819-0395, Japan;4. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;5. Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215123, China;1. Division of Advanced Nano-Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China;2. National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China;1. Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA;2. Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Ruoshui Road 398, Suzhou 215123, China;1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, PR China;2. Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA;3. Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716, USA;4. Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215123, PR China;5. Composites Research Center, Korean Institute of Materials Science, Changwon 641831, South Korea;1. Institute Centre for Energy (iEnergy), Mechanical and Materials Engineering Department, Masdar Institute of Science and Technology (MIST), P.O. Box 54224, Abu Dhabi, United Arab Emirates;2. Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, United States;1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, United States;2. Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC 27695, United States;3. Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215125, PR China;1. Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA;2. Dept. of Mechanical and Process Engineering, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8092, Switzerland;3. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA |
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| Abstract: | Vertically-aligned carbon nanotube array is expected to inherit high thermal conductivity and mechanical compliance of individual carbon nanotube and serve as thermal interface material. In this paper, vertically-aligned multi-walled carbon nanotube arrays have been directly grown on Pt film and the thermal performance has been studied by using laser flash technique. The determined thermal diffusivity decreases from 0.187 to 0.135 cm2 s?1 and the thermal conductivity increases from 1.8 to 3.1 W m?1 K?1 as temperature increases from 243.2 to 453.2 K. The fracture surface of the array peeled off the Pt film was characterized by scanning electron microscopy. It has been illustrated that the tearing surface is not smooth but fluffy with torn carbon nanotubes, indicating strong interfacial bonding and consequent small interface resistance between carbon nanotube array and Pt film. According to Raman spectra and transmission electron microscopy image, the possible mechanisms responsible for the thermal transport degradation are low packing density, twist, and the presence of impurities, amorphous carbon, defects and flaws. The influence of intertube van der Waals interactions has been studied by comparing the phonon dispersion relations and is expected to be not significant. |
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