Abstract: The invention discloses a polyaniline/c-MWNT produced by carboxylating at least one carbon nanotube to form at least one carboxylic carbon nanotube; mixing the at least one carboxylic carbon nanotube with a solvent to form a first carbon nanotube solution; mixing at least one aniline monomer with the first carbon nanotube solution to form a second carbon nanotube solution; mixing an ammonium persulfate solution with the second carbon nanotube solution to form a third carbon nanotube solution; air-extracting and filtering the third carbon nanotube solution to obtain the polyaniline/c-MWNT nanocomposite; cleaning and baking the polyaniline/c-MWNT nanocomposite.