International Journal of Advances in Science Engineering and Technology, ISSN: 2321-9009 Special Issue-1, June-2015 A Review On Graphene And Its Derivatives Based Polymer Nanocomposites For Electromagnetic Interference Shielding 212 A REVIEW ON GRAPHENE AND ITS DERIVATIVES BASED POLYMER NANOCOMPOSITES FOR ELECTROMAGNETIC INTERFERENCE SHIELDING PRERNA MODAK 1 D.V. NANDANWAR 2 Department of Physics, Post Graduate Department of Physics RMG College of Arts, Shri Mathuradas Mohata College of Science Commerce and Science College, Saoli, , Nagpur-440024, India Chandrapur. prm5101979@gmailo.com deoram.nandanwar@yahoo.co.in Abstract: Electromagnetic interference is an undesirable induction triggered by extensive use of alternating current/voltage which tries to produce corresponding induce signal in nearby electronic circuitry to spoil its performance. Electromagnetic interference shielding refers to the reflection and/or absorption of electromagnetic radiation by a material which thereby acts as a shield against the penetration of radiation through the shield. The (derivatives) Graphene, Graphene/polymer composites and CNT- GNS hybrid polymer for EMI shielding is reviewed. Keywords: Electromagnetic interference shielding, Carbon nanotubes, Graphene, Polypropylene, Carbon black. Introduction: Electromagnetic (EM) radiation is becoming more and more serious problem with increasing use of electrical and electronic devices in our daily lives. Mutual electromagnetic radiations interfere among themselves from the devices such as TVs, computers, mobile phones, radios and can degrade device performance. The technique to meet EM compatibility requirements is to shield or block these electromagnetic interfering radiations or signals from being emitted and/or penetrating into a defined space[1]. Initially Metal, in the form of thin sheets or sheathing, is an effective EMI shielding material. However, metal is expensive, heavy, and prone to corrosion, while adding to the complexity and cost of manufacturing processes. Conductive polymer composites offer a potentially cost-effective and process-friendly alternative to metal. Conventional conductive fillers such as metal flakes, stainless steel fibres, or carbon fibres are dispersed in a polymer matrix creating an electrically conductive network. EM radiation is either reflected or absorbed by the shielding composite materials[2] . Recently, conductive polymer nano-composites have attracted a great deal of academic and industrial interest due to their potential applications in many areas including EMI shielding. The nano-composite fillers have at least one dimension in the nanometer range, including materials such as carbon nanotubes (CNT) and graphite nanoplatelets (GNP)[3]. Graphene is a two dimensional, one atom thick carbon sheet with a planer honey comb lattice. Defect free graphene presents outstanding physical properties, such as high intrinsic mobility and ballistic transport, high thermal conductivity and Young’s modulus, an optical transmittance and large specific surface area. These high aspect ratio nano-scale fillers form conductive networks much more readily than conventional conductive fillers [4,5]. Due to larger filler-matrix interface, mechanical, electrical and thermal properties may also be enhanced or improved. Mechanism of Shielding: Shielding can be specified in the terms of reduction in magnetic (and electric) field or plane-wave strength caused by shielding. The effectiveness of a shield and its resulting EMI attenuation are based on the frequency, the distance of the shield from the source, the thickness of the shield and the shield material. Shielding effectiveness (SE) is normally expressed in decibels (dB) as a function of the logarithm of the ratio of the incident and exit electric (E), magnetic (H), or plane-wave field intensities (F): SE(dB) = 20 log (Eo/E1), SE (dB) = 20 log (Ho/H1), or SE (dB) = 20 log (Fo/F1), respectively [6]. With any kind of electromagnetic interference, there are three mechanisms contributing to the effectiveness of a shield. Part of the incident radiation is reflected from the front surface of the shield, part is absorbed within the shield material and part is reflected from the shield rear surface to the front where it can aid or hinder the effectiveness of the shield depending on its phase relationship with the incident wave [7]. Therefore, the total shielding effectiveness of a shielding material (SE) equals the sum of the absorption factor (SEA), the reflection factor (SER) and the correction factor to account for multiple reflections (SEM) in thin shields i.e. SE = SEA + SER + SEM Shielding Effectiveness: For the general EMI shielding material in the form of composites material,