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Nano-ccarbon materials such as carbon black, carbon nanotube and graphene exhibit unique electrical and mechanical properties and can be used as fillers to impart conduction to a matrix for electric conducting, sensing, static electricity dissipating and electromagnetic shielding.The conductivity of the composites related to the filler concentration is a characteristic criterion to determine their individual performance.At a critical filler concentration the composites show a transition from insulator to conductor.