A Water‐Based Synthesis of Octahedral, Decahedral, and Icosahedral Pd Nanocrystals

Abstract

Shapes from water: Pd nanocrystals with controllable shapes are synthesized by reducing a Pd salt with citric acid in aqueous solution. Citric acid favors the formation of octahedra, icosahedra, or decahedra (see picture) owing to its strong binding to the {111} facets of Pd. Shape control of these nanocrystals is readily accomplished by adjusting the amounts of Na2PdCl4 precursor and citric acid added to the reaction mixture.