Bimetal-conductive polymer janus composite nanostructure having electrical stimulation responsiveness, colloidal self-assembled structure thereof, preparation method thereof and biosensing, bioimaging, drug delivery and industrial application using the same

A method for preparing a self-assembled bimetal-polymer Janus nanostructure, comprising:

• i) preparing a metal nanoparticle forming a seed;
• ii) adding the seed metal nanoparticle to an aqueous solution in which a conductive polymer monomer and a surfactant are dissolved;
• iii) conducting an oxidation-reduction reaction between a metal ion and the conductive polymer monomer by adding a metal ion solution to the solution in which the seed metal nanoparticle is added in ii);
• iv) preparing a bimetal-polymer Janus nanoparticle by forming a bimetal nanoparticle part as the metal ion is reduced by receiving an electron donated by the conductive polymer and is deposited on the surface of the seed metal nanoparticle and forming a conductive polymer part asymmetrically as the conductive polymer monomer is oxidized, is deposited on only one side of the bimetal nanoparticle part and grows into a conductive polymer;
• v) adding ODA (octadecylamine) to a solution comprising the Janus nanoparticle;
• and
• vi) forming a bimetal nanocluster core and a polymer shell located radially around the core through self-assembly as the bimetal nanoparticle in the Janus nanoparticle is covalently bonded to the ODA.