title: Radial anisotropic growth of rhodium nanoparticles.
abstract: In this contribution, we report the synthesis of rhodium multipods that result from a homogeneous seeded growth mechanism. Small Rh nanocrystal seeds were synthesized by the reduction of RhCl3 in ethylene glycol in the presence of PVP. These seed particles could be subsequently used, without isolation, to form larger rhodium nanoparticles. A reaction temperature of 190 degrees C led to isotropic cubic Rh particles. Lowering the reaction temperature resulted in more anisotropic growth, which gave Rh cubes with horns at 140 degrees C, and Rh multipods at 90 degrees C. The anisotropic growth occurred in the (111) direction, as determined by high-resolution TEM (HRTEM). Anisotropic growth proceeds via a seeded growth mechanism, and not by oriented attachment.
authors.affiliation: Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, USA.
authors.forename: James D
authors.initials: JD
authors.lastname: Hoefelmeyer
authors.forename: Krisztian
authors.initials: K
authors.lastname: Niesz
authors.forename: Gabor A
authors.initials: GA
authors.lastname: Somorjai
authors.forename: T Don
authors.initials: TD
authors.lastname: Tilley
mesh_terms: D016880:Anisotropy; D003102:Colloids / Q000032:analysis / Q000737:chemistry; D003460:Crystallization / Q000379:methods*; D019855:Ethylene Glycol / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D010316:Particle Size; D011205:Povidone / Q000737:chemistry; D012238:Rhodium / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D003102:Colloids; D012238:Rhodium; D019855:Ethylene Glycol; D011205:Povidone