Plasmon-enhanced vibrational Raman spectroscopy enables us to learn about the conformations of single molecules.
Here, we report surface-enhanced Raman studies of single chains of the widely studied model conjugated polymer, MEH-PPV. We will provide evidence that field localization on nanotextured silver surfaces is so strong that,
remarkably, scattering from a single chromophore out of hundreds dominates the Raman spectrum. We observe wide
variation of spectra from chain to chain and strong temporal fluctuations in the Raman spectrum and intensity for
individual chains of MEH-PPV. In some cases, we are able to clearly associate these fluctuations with
photochemistry and polaron formation. In most cases, however, we believe that local conformational changes in the
polymer are responsible for the fluctuations.
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