Binary ordered colloidal crystal, metal nano array and preparation method thereof

The invention discloses a binary ordered colloidal crystal, a metal nano array and a preparation method thereof, belonging to the field of nano materials. The preparation method of the binary ordered colloidal crystal comprises the steps of evenly mixing emulsions of polystyrene nanoparticles with different particle sizes to form mixed emulsion; adding absolute ethyl alcohol, mixing to be uniform to form a mixed solution; draining the mixed solution onto the surface of deionized water, adding SDS (Sodium Dodecyl Sulfonate) to form a close-packed colloidal crystal film, and transferring the film to a hydrophilic substrate to obtain the binary ordered colloidal crystal. The method is simple and easy to operate, and the prepared binary ordered colloidal crystal has high order degree. The prepared binary ordered colloidal crystal is subjected to plasma etching and vacuum coating to obtain the metal nano array. The method has the advantages of simple process, convenience in operation and low cost.