Fabrication process and electromagnetic wave absorption characterization of a CNT/Ni/epoxy nanocomposite.
Since carbon nanotube (CNT) was first discovered in 1991, it has been considered as a viable type of conductive filler for electromagnetic wave absorption materials in the GHz range. In this paper, pearl-necklace-structure CNT/Ni nano-powders were fabricated by a polyol process as conductive fillers. Compared to synthesized CNT, pearl-necklace Ni-decorated CNT increased the electrical conductivity by an order of 1 due to the enhancement of the Ni-conductive network. Moreover, the decorated Ni particles prevented the agglomeration of CNTs by counterbalancing the Van der Walls interaction between the CNTs. A CNT/Ni nanocomposite showed a homogeneous dispersion in an epoxy-based matrix. This enhanced physical morphology and electrical properties lead to an increase in the loss tangent and reflection loss in the CNT/Ni/Epoxy nanocomposite compared to these characteristics of a CNT/Epoxy nanocomposite in range of 8-12 GHz. The electromagnetic wave absorption properties of CNT/Ni/epoxy nanocomposites will provide enormous opportunities for electronic applications where lightweight EMI shielding or electro-magnetic wave absorption properties are necessary.
Department of Chemistry Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
Seongwoo
S
Ryu
Chan Bin
CB
Mo
Haeshin
H
Lee
Soon Hyung
SH
Hong
D000042:Absorption; D004574:Electromagnetic Fields; D004853:Epoxy Resins / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry* / Q000528:radiation effects; D010316:Particle Size; D012542:Scattering, Radiation
D004853:Epoxy Resins; D037742:Nanotubes, Carbon; D009532:Nickel