ABSTRACT
Electromagnetic interference between electronic devices becomes a major problem nowadays due to tremendous increase of their use in our daily life. To avoid such interferences, metal-based materials are used to fabricate enclosures capable of minimizing the radiation escape. Anyway, the use of metals as electromagnetic radiation shielding materials has certain disadvantages like weight increase and small corrosion resistance. Recently, conductive polymer composites became a better choice due to their lightweight, corrosion resistance, and flexibility in fabrication.
In this chapter, we first briefly discuss about the electromagnetic radiation shielding using conventional metal-based shields. Then, we make an overview on conductive polymer composites applied for electromagnetic shields. In the next section, we introduce a new hybrid composite material based on multiwalled carbon nanotubes (MWCNTs) and soft magnetic CoFeB nanoparticles with applications for electromagnetic interference shielding. High aspect ratio MWCNTs have been synthesized by chloride-mediated 258chemical vapor deposition method. Then, a composite material consisting of an epoxy resin, MWCNTs and CoFeB nanoparticles was prepared and its electromagnetic radiation shielding capability was tested. The new material showed good absorption properties in the microwave frequency domain. Few attempts to improve the shielding effectiveness of these new composite materials are also presented and discussed.
