CPC C09D 11/037 (2013.01) [B82Y 40/00 (2013.01); C01B 32/182 (2017.08)] | 8 Claims |
1. A method of preparing a graphene ink composition, the method comprising:
a step of preparing a first colloid in which charged chemically modified graphene is dispersed,
wherein the charged chemically modified graphene has a lateral size of 50 to 50000 nm and an average thickness of 2 nm or less, and
wherein the charged chemically modified graphene includes oxygen and nitrogen, and an atomic percent difference between the oxygen and the nitrogen is greater than 3 at %;
a step of preparing a second colloid in which a graphene flake is dispersed,
wherein the graphene flake has a lateral size of 0.3 to 50 μm and an average thickness of 2 to 20 nm and wherein the charged chemically modified graphene is different from the graphene flake; and
a step of preparing a graphene ink composition by mixing the first colloid, the second colloid, a binder and a solvent.
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