Graphene and carbon nanotube have been researched for many applications due to their great material properties including electrical, mechanical and optical properties. Although single graphene has higher electrical conductivity than CNT, graphene films show higher resistance than CNT films. To improve electrical conductivities, hybridization of graphene and CNT was done expecting formation of more conductive paths. Improvement of electrical conductivities by mixing graphene and CNT was shown in some studies. There were various methods to make graphene and CNT films such as filtration, dip coating, electrophoretic deposition, inkjet printing etc. In this study, we used inkjet printing as a deposition method for graphene/CNT hybrid ink. Making stable ink solution is important for inkjet printing. Physical wrapping of graphene and CNT with polymer is introduced to disperse the graphenes and CNTs in the solution. The increase in the electrical conductivity when hybridized is explained by the increase in the number of contacts in this study.
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