Design of Temperature Coefficient of Resistance of Graphene Composite for Rapid Heating Elements

Carbon based nano composites have been extensively studied as a rapid and flexible heater unit due to its superior heating performance and electrical properties. Composites consisting of a polymer and a conducting filler show either a positive (PTC) or a negative temperature coefficient (NTC) of resistance during heating, depending on several factors. However, most one or two dimensional nano-carbon based composites show a NTC behavior causing overcurrent and fire. In this study, we developed a PTC and zero temperature coefficient of resistance (TCR) graphene composites for thermal stability and reliable temperature control. The thermal performances and electrical properties could be easily controlled by the degree of alignment of graphene in the matrix. Robust mechanical shear forces involved to control degree of alignment of graphene.