SYNTHESIS OF GRAPHENE PAPER FOR APPLICATION IN EMI SHIELDING

Abstract

The increase in the complexity of the packing of electronic devices with highly integrated circuits (IC's) or electronic components generates electromagnetic (EM) interference (EMI) as by product1,2. EMI consists of EM noises which cause the reduction in the performance of the nearby electronic circuit/appliance or may pose human health hazards3–5.EMI is a very common phenomenon that can be recognized even by a nontechnical person as radio static and distorted television reception in the form of flickers or flashes on the screen and click is sound or buzzing noise on audio systems ,arising due to external EM interferences6. EMI causes unnecessary loss of energy/resources, electronic malfunctioning or breakdowns, health hazards or even loss of precious human life.6–8 Generally, high frequency signals are used in the operation of various electronic devices. Any transmittance of the EM fields created by these signals to surrounding environment may cause the malfunctioning of the nearby equipment. To prevent such EM hazards, our electronic devices should be shielded in such a way that both the incoming and outgoing interferences can get filtered out or suppressed. EMI shield is essentially a barrier to regulate the transmission of the EM wave across its bulk and in electronics terminology the, term ‘Shield” usually refers to an enclosure which completely encloses an electronic product or a portion of that product and prevents the EM emission from an outside source to deteriorate its electronic performance.1,9 All the electromagnetic waves (EM) consist of two essential components i.e. a magnetic field (H) and an electric field (E) as shown schematically in Fig 1. These two fields are perpendicular to each other as well as to the direction of the wave propagation.