Reduced graphene oxide/aramid nanofiber composite aerogel for electromagnetic shielding and preparation method thereof

The invention discloses a preparation method of reduced graphene oxide/aramid nanofiber composite aerogel for electromagnetic shielding. The preparation method comprises the following steps: reducing graphene oxide by adopting sodium hydrogen sulfite to prepare reduced graphene oxide; mixing aramid fibers, potassium hydroxide, dimethyl sulfoxide and deionized water to prepare aramid nanofiber gel; and combining the reduced graphene oxide with the aramid nanofiber gel, performing ultrasonic treatment to uniformly disperse the reduced graphene oxide and the aramid nanofiber gel, putting the whole into a refrigerator for pre-freezing, and finally performing freeze drying to prepare the reduced graphene oxide/aramid nanofiber gel composite aerogel with different mass ratios. The method has the advantages of simplicity and easiness in operation, mild reaction conditions and the like. The reduced graphene oxide/aramid nanofiber composite aerogel for electromagnetic shielding prepared by the method has good mechanic