▎ 摘　　要

NOVELTY - Preparing nitrogen-, phosphorus- or sulfur-doped reduced graphene oxide, involves: (a) preparing an intermediate product of reduced graphene oxide by processing a solution comprising partially reduced graphene oxide and an ionic liquid comprising a cation containing nitrogen, phosphorus or sulfur; (b) annealing the intermediate product; (c) heating the product and then performing co-evaporation; (d) performing thermal reduction of the mixture to obtain reduced graphene oxide; and (e) partly substituting nitrogen-, phosphorus-, or sulfur-atom to be doped on the obtained reduced graphene oxide. USE - The method is useful for preparing nitrogen-, phosphorus- or sulfur-doped reduced graphene oxide (claimed), which is useful for semiconductor devices. ADVANTAGE - The method is capable of eco-friendly preparing the nitrogen-, phosphorus- or sulfur-doped reduced graphene oxide with improved nonflammability and thermal stability using the cost-effective ionic liquid. DETAILED DESCRIPTION - Preparing nitrogen-, phosphorus- or sulfur-doped reduced graphene oxide, comprises: (a) preparing an intermediate product of reduced graphene oxide by processing a solution comprising partially reduced graphene oxide and an ionic liquid comprising a cation containing nitrogen, phosphorus or sulfur; (b) annealing the intermediate product of reduced graphene oxide; (c) heating the annealed product and then performing co-evaporation with a solvent having high boiling point; (d) performing thermal reduction of the mixture to obtain reduced graphene oxide; and (e) partly substituting nitrogen-, phosphorus-, or sulfur-atom to be doped on the obtained reduced graphene oxide.