摘要
Morphological evolution of Pd nanoparticles was studied in a solution-phase synthesis using cetyltrimethylammonium bromide （CTAB） and CTAB/sodium citrate mixture as capping agents, respectively. The morphological diversity of Pd nanoparticles is the combined effect of different Pd twinned seeds formed in the nucleation stage and selectively enlarging one set of crystallographic facets in the growth stage, both of which can be affected by the concentrations of CTAB. Through changing the concentrations of CTAB and sodium ascorbate, Pd nanoparticles with different shapes were obtained. When citrate ions were introduced to manipulate the nucleation and growth process, star-shaped icosahedra and nanorods with pentagram cross-sections were obtained. Pd nanoparticles with different shapes have quite different surface plasmon resonance and surface-enhanced Raman scattering properties.
基金
ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.i0574122, No.50772110, and No.50721091）, the National Basic Research Program of China （No.2006CB922000, No.2007CB925202, and No.2009CB939901）, and the Fund of the Chinese Academy of Sciences for Key Topics in Innovation Engineering （KJCX2.YW.W06-3）
