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Highly conducting carbon nanotube composite for light-weight electric heating unit applications
Keywords: Nanocomposite, heater, Carbon nanotubes
CNT/polymer composites have attracted interests for their great potential applications such as electromagnetic interference EMI shielding, electronic packaging, radar absorption, and high charge storage capacitors. However, due to the unique structural features of CNTs, e.g., the nanometer size and the high aspect ratio, CNTs tend to aggregate. Thus there is a need to overcome these problems and provide methods for practical CNT composite synthesis where CNTs can be stably and uniformly dispersed in the polymer matrix. In this study, a highly conducting CNT/ polydimethylsiloxane(PDMS) composite has been shown to be applicable as electrical heating units. Using a high shear processing technique, the CNT/PDMS composite has fairly uniform dispersion condition and no agglomeration of CNTs. The percolation threshold of the CNT/PDMS composite is achieved below 0.1vol.% of CNT loading, which is a lower value than previously reported. We successfully demonstrated that the CNT/PDMS composite having high electrical conductivity can be quickly heated from room temperature up to 130°C by applying voltage. Therefore, these types of CNT/PDMS composite could be used in electric heating applications effectively. For example, pattern-able polymeric MEMs heater can be simply fabricated by screen printing of CNT/PDMS composite and metal deposition processes. In addition, compared to other heaters, CNT/PDMS composite is a light-weight and low-cost solution with a good sensitivity and no geometrical constraints.
Kun-mo Chu,
Samsung Advanced Institute of Technology
Yongin, Gyeonggi-do

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