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Shape-Controlled Synthesis of Palladium Nanoparticles and Their SPR/SERS Properties
Xiao-shuang Shen,Guan-zhong Wang*,Xun Hong,Wei Zhu
Author NameAffiliationE-mail
Xiao-shuang Shen Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China  
Guan-zhong Wang* Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China gzwang@ustc.edu.cn 
Xun Hong Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China  
Wei Zhu Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China  
Abstract:
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 con-centrations 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.
Key words:  Palladium, Nanoparticle, Shape-controlled, Surface-enhanced Raman scatter-ing
FundProject:
Shape-Controlled Synthesis of Palladium Nanoparticles and Their SPR/SERS Properties
沈小双,王冠中*,洪勋,祝巍
摘要:
在水溶液中分别以十六烷基三甲基溴化铵(CTAB)和CTAB/柠檬酸钠混合剂为包覆剂合成钯纳米颗粒,并研究其形貌演变.钯纳米颗粒在成核阶段会形成具有不同孪晶结构的晶核,在生长阶段又会选择性的放大某一组晶面,这两个因素导致了钯纳米颗粒形貌的多样性.在合成中CTAB既会影响钯纳米颗粒的成核,也会影响颗粒晶面的选择性生长.通过改变CTAB和还原剂的量可以调控钯纳米颗粒的形貌.溶液中CTAB和还原剂浓度的改变,非常明显地影响合成产物中不同形貌钯纳米颗粒的产率.通过向溶液中引入柠檬酸离子调控纳米颗粒的成核与生长过程,首次合成出了星状钯二十面体和截面为五角星形的钯纳米棒.这些不同形貌的钯纳米颗粒有着不同的表面等离子体共振和表面增强拉曼散射性质.
关键词:  钯,纳米颗粒,形貌控制,表面增强拉曼散射
DOI:10.1088/1674-0068/22/04/440-446
分类号: