Core–shell colloids with two well-differentiated sides (see Figure) have been produced by a combination of electron beam evaporation (EBE) and polyelectrolyte-driven layer-by-layer (LbL) assembly. The colloids are patterned with different optical and magnetic functionalities through deposition of silica-coated gold nanoparticles and evaporation of gold and nickel, forming different thin films on opposite hemispheres.
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