Orientation-Sensitive Peptide-Induced Plasmonic Circular Dichroism in Silver Nanocubes

Tatyana Levi-Belenkova, Alexander O. Govorov, Gil Markovich

Research output: Contribution to journalArticlepeer-review


Polyproline II-based helical peptides were adsorbed to silver nanocubes through a cysteine linker and induced circular dichroism (CD) in two of their plasmon resonance modes. Inversion of the peptide's orientation with respect to the surface led to inversion of the plasmonic CD signal. This phenomenon could not be explained by the simple molecule-plasmon dipolar interaction model and could be due to the multipolar nature of the plasmon modes. Elongation of the polyproline peptide led to a significant increase of the induced CD signal. Surprisingly, the effect did not change with sharpening of the edges of the silver nanocubes. The change to a polyproline I helix caused nulling of the induced plasmonic CD.

Original languageEnglish
Pages (from-to)12751-12756
Number of pages6
JournalJournal of Physical chemistry c
Issue number23
StatePublished - 16 Jun 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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