Facile approach to generating polymeric nanoarrays containing populations of nanoparticles

The production of nanoarrays containing a population of entrapped, heterogeneous nanoparticles is reported. The nanoarray consists of a nanoporous film with pores of diameter 60-180 nm, formed from the phase separation of two immiscible polymers: polystyrene (PS) and polymethylmethacrylate coated onto glass or silicon wafer. Nanoparticles of PS (120 nm) and silica (90 nm) were deposited into the nanoporous films to generate the nanoarray containing a mixed population of nanoparticles.