Plasmonic nanoparticle networks formed using iron porphyrin molecular bridges

Lenzi J. Williams, Anne Marie Dowgiallo, Kenneth L. Knappenberger

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The adsorption orientation of the iron(iii) tetrakis(1-methyl-4-pyridyl) porphine (FeTMPyP) μ-oxo-bridged dimer species located in the inter-particle gap of solid gold nanosphere (SGN) and hollow gold nanosphere (HGN) networks was studied using a combination of linear extinction and surface-enhanced Raman Scattering (SERS) measurements. Nanoparticle aggregation was accomplished by μM additions of iron porphyrin to the colloidal SGN and HGN solutions. Aggregation was monitored by measuring the UV-Visible-NIR extinction spectra of the nanoparticle systems; a broadened and red-shifted localized surface plasmon resonance (LSPR), relative to the LSPR of the isolated nanoparticles, indicated aggregate formation. In conjunction with the LSPR extinction measurements, wavelength-dependent SERS measurements were used to determine the orientation of the FeTMPyP with respect to the SGN and HGN surfaces.

Original languageEnglish (US)
Pages (from-to)11840-11845
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number28
DOIs
StatePublished - Jul 28 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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