Improved monodispersity of plasmonic nanoantennas via centrifugal processing

Timothy P. Tyler, Anne Isabelle Henry, Richard P. Van Duyne, Mark C. Hersam

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Noble metal nanoparticle clusters underlie a variety of plasmonic devices and measurements including surface-enhanced Raman spectroscopy (SERS). Because of the strong dependence of plasmonic properties on nanoparticle cluster aggregation state, the elimination of non-SERS-active structures and the refinement of the nanoparticle cluster population are critical to realizing uniform and reproducible structures for plasmonic nanoantenna applications such as SERS-based sensors. In this Letter, we report a centrifugal sorting technique for gold core/silica shell nanoparticles that host SERS reporter molecules at the gold/silica interface. The relatively massive nanoparticle clusters are sorted by sedimentation coefficient via centrifugation in a high-viscosity density gradient medium, iodixanol, which yields solutions that contain a preponderance of one aggregation state and a diminished monomer population, as determined by transmission electron microscopy, extinction spectroscopy, and SERS. A quantitative analysis of the nanoparticle sedimentation coefficients is presented, thus allowing this approach to be predictably generalized to other nanoparticle systems.

Original languageEnglish
Pages (from-to)218-222
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume2
Issue number3
DOIs
Publication statusPublished - Feb 3 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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