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Tailoring Plasmon Coupling in Self-Assembled One-Dimensional Au Nanoparticle Chains through Simultaneous Control of Size and Gap Separation.


ABSTRACT: We investigated the near- and far-field response of one-dimensional chains of Au nanoparticles (NPs) fabricated with high structural control through template guided self-assembly. We demonstrate that the density of polyethylene glycol (PEG) ligands grafted onto the NP surface, in combination with the buffer conditions, facilitate a systematic variation of the average gap width (g) at short separations of g<1.1nm. The overall size (n) of the cluster was controlled through the template. The ability to independently vary n and g allowed for a rational tuning of the spectral response in individual NP clusters over a broad spectral range. We used this structural control for a systematic investigation of the electromagnetic coupling underlying the superradiant cluster mode. Independent of the chain length, plasmon coupling is dominated by direct neighbor interactions. A decrease in coupling strength at separations ?0.5nm indicates the presence of non-local and/or quantum mechanical coupling mechanisms.

SUBMITTER: Chen T 

PROVIDER: S-EPMC3766581 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature

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Tailoring Plasmon Coupling in Self-Assembled One-Dimensional Au Nanoparticle Chains through Simultaneous Control of Size and Gap Separation.

Chen Tianhong T   Pourmand Mahshid M   Feizpour Amin A   Cushman Bradford B   Reinhard Björn M BM  

The journal of physical chemistry letters 20130601 13


We investigated the near- and far-field response of one-dimensional chains of Au nanoparticles (NPs) fabricated with high structural control through template guided self-assembly. We demonstrate that the density of polyethylene glycol (PEG) ligands grafted onto the NP surface, in combination with the buffer conditions, facilitate a systematic variation of the average gap width (<i>g</i>) at short separations of <i>g</i><1.1nm. The overall size (<i>n</i>) of the cluster was controlled through the  ...[more]

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