![]() Structure and Composition of the Core and Shell ESPD can also be used to produce coreshell nanoparticles of other compositions. ![]() Such coreshell nanoparticles are unique and may find attractive functional applications. In the present paper, we report an extension of this method and show that nanoparticles covered with amorphous shell can also be produced by ESPD. The selection is achieved through the suitable choice of electrolyte and the ESPD processing parameters. In this process, nano sized precipitates are extracted from a two phase alloy by selectively dissolving the matrix phase (by electrochemical selective phase dissolution – ESPD). Recently, a new method for producing nanoparticles of intermetallic phases was reported by us. A few examples of core/shell type nanoparticles are Ag/ Au, CdSe/ZnS or MgO/Fe2O3. Amorphous Si and SiOx are also suitable shell material in some applications. Further, magnetic nanoparticles are covered by biocompatible organic shell material. for enhanced specific chemical functions, nanoparticles may be covered by a catalytically active shell material. Naturally, occurring inert oxide shells on metal particles are not uncommon. This distinction is important because for many applications, a shell covering the nanoparticles is deliberately formed either to protect the core or enhance a specific property on the surface of the particle. Here, we distinguish shells obtained naturally and artificially. Most research, however, focuses on bare nanoparticles in many applications, however, nanoparticles covered with a shell having a specific function is actually needed. Nanoparticles are finding innovative applications as functional material. The core-shell nanoparticles are extracted from a two phase metallic alloys by selective phase separation using electrochemical dissolution technique. A method to produce nanoparticles with core-shell structure, having crystalline Ni3Si core and amorphous Si(O) shell is reported. Core-Shell Nanoparticles: Imaging and Structure Determination of the Core and the Shell Regions.
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