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 journalArticle

55 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

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Raman spectroscopy
Nanoparticles
nanoparticles
Processing
Sedimentation
Silicon Dioxide
Gold
Agglomeration
Silica
gold
silicon dioxide
Centrifugation
Metal nanoparticles
Surface measurement
Precious metals
Sorting
coefficients
Nanoantennas
classifying
noble metals

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Improved monodispersity of plasmonic nanoantennas via centrifugal processing. / Tyler, Timothy P.; Henry, Anne Isabelle; Van Duyne, Richard P.; Hersam, Mark C.

In: Journal of Physical Chemistry Letters, Vol. 2, No. 3, 03.02.2011, p. 218-222.

Research output: Contribution to journalArticle

Tyler, Timothy P. ; Henry, Anne Isabelle ; Van Duyne, Richard P. ; Hersam, Mark C. / Improved monodispersity of plasmonic nanoantennas via centrifugal processing. In: Journal of Physical Chemistry Letters. 2011 ; Vol. 2, No. 3. pp. 218-222.
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