Plasmonic nanoparticle chains via a morphological, sphere-to-string transition

Youngjong Kang, Kris J. Erickson, T. Andrew Taton

Research output: Contribution to journalArticlepeer-review

118 Scopus citations

Abstract

Au nanoparticles encapsulated within polystyrene-block-poly(acrylic acid) (PS-b-PAA) micelles assemble into regular, one-dimensional arrays when they are exposed to solvent conditions that relax interfacial curvature in the micellar shell. Nanoparticle chaining was induced by adding salt, acid, or cationic carbodiimide to the suspension of purified encapsulated Au nanoparticles (Au@PS-b-PAA). The resulting assemblies were characterized by scanning and transmission electron microscopies, by dark-field optical microscopy, and by visible absorption spectroscopy. The length of the chains was modulated by varying the concentration of additive. More importantly, the spacing between Au nanoparticles was dictated entirely by the shell thickness of the Au@PS-b-PAA starting material. Far-field polarization microspectroscopy demonstrated directional surface plasmon coupling in a straightened nanoparticle chain, which is a basic requirement for the use of these assemblies as plasmon waveguides.

Original languageEnglish (US)
Pages (from-to)13800-13801
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number40
DOIs
StatePublished - Oct 12 2005

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