High-yield synthesis and optical response of gold nanostars
High-yield synthesis and optical response of gold nanostars
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DOI：
10.1088/0957-4484/19/01/015606
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发表时间：
2008-01-09
期刊：
影响因子：
3.5
通讯作者：
Liz-Marzan, Luis M.
中科院分区：
文献类型：
--
作者：
Senthil Kumar, Pandian;Pastoriza-Santos, Isabel;Liz-Marzan, Luis M.
通过在N，N-二甲基甲酰胺(DMF)中聚乙烯基吡咯烷酮(PVP)的浓溶液中还原HAuCl4，在预制的Au纳米粒子的存在下，以极高的产率合成了具有单晶尖端的多针脚Au纳米粒子(纳米星)，而不需要外部能源。纳米STAR色散显示出明确的光学响应，(通过理论模拟)发现该响应包括限制在尖端内的主模和限制在中心体内的次模。此外，表面增强拉曼散射(SERS)响应的计算还表明，这种形态将与传感应用相关。
Multipod Au nanoparticles (nanostars) with single crystalline tips were synthesized in extremely high yield through the reduction of HAuCl4 in a concentrated solution of poly(vinylpyrrolidone) (PVP) in N,N-dimethylformamide (DMF), in the presence of preformed Au nanoparticle seeds, but with no need for external energy sources. Nanostar dispersions display a well-defined optical response, which was found (through theoretical modeling) to comprise a main mode confined within the tips and a secondary mode confined in the central body. Calculations of the surface enhanced Raman scattering (SERS) response additionally show that this morphology will be relevant for sensing applications.