Tip Enhanced Silver Growth on Shaped Controlled Nickel – Meital Shviro and David Zitoun

Meital Shviro and David Zitoun*

Department of Chemistry, Bar Ilan Institute of Nanotechnology and Advanced Materials (BINA), Ramat Gan 52900, Israel

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ABSTRACT: We report on the synthesis of Ni/Ag heterogeneous nanocrystals. Ag

almost exclusively nucleates on the vertices of Ni nanopyramids and vertices and edges

of Ni nanocubes. The synthesis is carried on using the decomposition of an

organometallic Ni precursor to achieve a shape control (cubes and pyramids) followed

by a nonaqueous galvanic replacement reaction of Ag(I). The colloids exhibit both

plasmonic resonance and superparamagnetic behavior. Interestingly, the bimetallic

nanocrystals display a magnetic moment higher than the pristine Ni nanocrystals,

suggesting a specific magnetic polarization of the Ni/Ag interface or silver tips.