The invention provides a method for purifying ultrafine
silver nanowires. The method comprises the following steps that firstly, the unpurified ultrafine
silver nanowires are prepared; and secondly, the unpurified ultrafine
silver nanowires prepared in the step 1 are taken and washed with a
solvent, then the unpurified ultrafine silver nanowires are dissolved through a
solvent, then aqueous
ammonia is dropped in, still standing is conducted, bottom precipitate is removed, and thus a purified ultrafine silver
nanowire solution is obtained. The aqueous
ammonia is added to the unpurified ultrafine silver
nanowire solution,
Ostwald ripening of silver nanoparticles in the unpurified ultrafine silver
nanowire solution is assisted by the aqueous
ammonia, growth of the silver nanoparticles is induced, and then the grown silver nanoparticles can be separated from the silver nanowires through a still standing process without other complicated purifying processes, and the ultrafine silver nanowires with the
mass percent being 60% to 85% and the
diameter being 20 nm to 30 nm are obtained.