Metallic nanobowls by galvanic replacement reaction on heterodimeric nanoparticles Well-defined metallic nanobowls can be prepared by extending the concept of a protecting group to colloidal synthesis. Magnetic nanoparticles are employed as “protecting groups” during the galvanic replacement of silver with gold. The replacement reaction is accompanied by spontantous dissociation of the protecting groups, leaving behind metallic nanobowls. 8 5 654-660 654-660 Wiley 1