High heat-resistant graphene oxide, method for manufacturing conductive graphene fiber by using same, and conductive graphene fiber manufactured therefrom

A method of manufacturing conductive graphene fiber from high heat-resistant graphene oxide, the method comprising:

• a first step of preparing a spinning solution containing graphene oxide;
• a second step of preparing graphene oxide fiber by wet spinning the spinning solution to form epoxy groups hydrogen-bonded to other epoxy groups on a surface of the graphene oxide;
• and
• a third step of preparing conductive graphene fiber by reducing the graphene oxide fiber through heat treatment,
• wherein the graphene oxide is high heat-resistant graphene oxide not having a lactol group or a carboxyl group as an oxygen-containing function group on the surface thereof but having an epoxy group or a hydroxyl group as an oxygen-containing functional group on the surface, thereby exhibiting thermal resistance, and
• wherein the heat treatment is performed in an air environment in a temperature range in which the high heat-resistant graphene oxide exhibits thermal stability.

A method of manufacturing conductive graphene fiber from high heat-resistant graphene oxide, comprising:

• preparing a spinning solution containing graphene oxide by wet spinning the spinning solution in a coagulation bath containing a metal cation-free acid solution as a coagulant, and the graphene oxide fiber is formed by a mechanism in which epoxy groups or hydroxyl groups on a surface of the graphene oxide are hydrogen-bonded to each other by the acid solution, and the graphene oxide is connected to each other and solidified;
• wet spinning the spinning solution to form epoxy groups hydrogen-bonded to other epoxy groups on the surface of the graphene oxide;
• and
• preparing conductive graphene fiber by reducing the graphene oxide fiber through heat treatment, wherein:
• the graphene oxide is high heat-resistant graphene oxide not having a lactol group or a carboxyl group as an oxygen-containing function group on the surface thereof but having an epoxy group or a hydroxyl group as an oxygen-containing functional group on the surface, thereby exhibiting thermal resistance, and
• the heat treatment is performed in an air environment in a temperature range in which the high heat-resistant graphene oxide exhibits thermal stability.