etallic nanoparticles possess unique catalytic, electronic, optical, and magnetic properties . Coating a secondary material on a nanoparticle core (e.g. to form a core@shell nanoparticle) can result in a combination of these properties, and introduce biocompatibility and environmental stability to the bare core . Core@shell nanoparticles can have either crystalline or amorphous shells. While crystalline shells can be deposited on metallic cores to form nanoparticles such as Au@Ag , this remains challenging due to lattice mismatch , etching of the core due to shell electrochemical potential, and restricted chemical synthesis routes. In contrast, amorphous carbon and silica shells are more compatible with different metallic cores. Yet, carbon shell coatings generally require complicated synthesis routes which involve high temperature pyrolysis . Silica shell coatings have a facile aqueous phase chemical synthesis which is compatible with a wide variety of nanoparticle cores . However, silica shell coatings add limited functionality to the nanoparticle core as silica is chemically inert, electrically insulating, and magnetic and optically inactive.