Chemical Sharpening of Gold Nanorods: The Rod-to-Octahedron Transition


  • I.P.-S. acknowledges the Isidro Parga Pondal Program (Xunta de Galicia, Spain). J.P.-J. acknowledges the Santiago Ramón y Cajal Program (MEC, Spain). This work was supported by the Spanish Ministerio de Educación y Ciencia (grant MAT2003-02991), Xunta de Galicia, and COST Action D43.


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Changing faces: The shape of gold nanorods can be finely tuned by controlled growth under sonication in DMF in the presence of poly(vinylpyrrolidone). Reshaping involves the formation of rods with sharp tips and strongly faceted lateral faces, and ultimately leads to perfect, single-crystal octahedrons (see images). Mechanistic considerations indicate a shape-inducing effect of the polymer through different binding interactions for the different faces.