期刊
NANO LETTERS
卷 14, 期 7, 页码 3799-3808出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5009053
关键词
STEM-EELS; dark modes; Surface Plasmon; Electron-Energy Loss Spectroscopy; Nanoparticle Chains
类别
资金
- University of Melbourne
- Australian Research Council (ARC) [LF 100100117]
- ARC [FT110100545, DP120101573]
- Natural Sciences and Engineering Research Council (NSERC), Canada
- Australian Research Council [FT110100545] Funding Source: Australian Research Council
We present a scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS) investigation of gold nanosphere chains with lengths varying from 1 to 5 particles. We show localized EELS signals from the chains and identify energy-loss peaks arising due to l = 1, 2, 3, 4, and S plasmon modes through the use of EELS mapping. We also show the evolution of the energy of these modes as the length of a given chain increases, and we find that a chain containing N particles can accommodate at least N experimentally observable modes, in addition to the transverse mode. As the chain length is increased by the addition of one more gold particle to the chain, the new N + 1 mode becomes the highest energy mode, while the existing modes lower their energy and eventually asymptote as they delocalize along the chain. We also show that modes become increasingly difficult to detect with the EELS technique as l approaches N. The data are compared to numerical simulations.
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