Rhodium nanoparticles from cluster seeds: Control of size and shape by precursor addition rate

被引：106

作者：

Humphrey, Simon M.

Grass, Michael E.

Habas, Susan E.

Niesz, Krisztian

Somorjai, Gabor A. ^{[1
]}

Tilley, T. Don

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Chem & Mat Sci, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2007年 / 7卷 / 03期

关键词：

D O I：

10.1021/nl070035y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The size-tunable synthesis of poly(vinylpyrrolidone)-stabilized cuboctahedral rhodium nanoparticles with mean diameters ranging between 3-7 nm and multipod structures was accomplished using seeded growth methods. Isotropic PVP-capped 2.9 nm seeds were prepared by ligand exchange on rhodium-triphenylphosphine metal-organic clusters. Quantitative investigation of reaction parameters in ethylene glycol revealed that size and shape could be controlled at a single reaction temperature of 120 degrees C. The rate of rhodium monomer addition was found to be critical for monodispersity and shape control, regardless of thermodynamic factors. Solvent viscosity, varied by changing the polyol solvents, indicated that autocatalytic addition kinetics are responsible for isotropic versus anisotropic growth.

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页码：785 / 790

页数：6

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