Mapping Bright and Dark Modes in Gold Nanoparticle Chains using Electron Energy Loss Spectroscopy.
Steven J Barrow, David Rossouw, Alison M Funston, Gianluigi A Botton, Paul Mulvaney
Nano Letters | AMER CHEMICAL SOC | Published : 2014
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 5 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 bec..View full abstract
Awarded by Australian Research Council (ARC)
Awarded by ARC
S.J.B. thanks the University of Melbourne for a MATS scholarship and the Ernst and Grace Matthaei research scholarship. P.M. acknowledges Australian Research Council (ARC) support through LF 100100117. A.M.F. would like to thank the ARC for support via FT110100545 and DP120101573. G.A.B. is grateful to the Natural Sciences and Engineering Research Council (NSERC), Canada, for a Discovery grant supporting this work. The electron microscopy was carried at the Canadian Centre for Electron Microscopy, a national facility supported by NSERC and McMaster University.