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|Enhancing the thermal conductivity of composite materials|
|Keywords: thermal conductivity, composite materials, carbon naotubes|
|Seeking high thermal conductivity materials is significant for package due to problem of heat dissipation with the development of technology. And fabricating composite materials is an effective and economic solution to improve the thermal performance. In this paper, we firstly tuned the thermal conductivity of Al-O-N thin films by adjusting the nitrogen concentration. Then we used diamond particles with different sizes and carbon nanotubes embedded in Al-O-N thin films to further enhance the thermal performance of the films. The thermal conductivity has a strong enhancement by tuning the concentration of nitrogen and doping of carbon nanotubes. But the thermal conductivity of the films is strongly dependent on the particle size of embedded diamond particles. A 19% enhancement in thermal conductivity can be achieved by embedding diamond particles of 1 μm radius in thin films. However, the thermal conductivity decreases after embedding with 10 nm radius diamond particles. The doping results are discussed with high volume model, which confirms that the interface thermal resistance between doping materials and films an important role in determining the thermal conductivity of the as-grown carbon material doped films. At last, we fabricated CNT/epoxy matrix composite by using poly(ethyleneimine) (PEI) functionalized carbon nanotubes (CNTs) and got a 660 % enhancement in thermal conductivity when the PEI functionalized CNTs’ loading is as high as 8 vol. %.|
tate Key Laboratory of Electronic Thin films and Integrated Devices, University of Electronic Science & Technology of China