Conformations of single chains of conjugated polymers by plasmon-enhanced Raman scattering

Zhenjia Wang; Lewis J. Rothberg

doi:10.1117/12.681668

3 October 2006 Conformations of single chains of conjugated polymers by plasmon-enhanced Raman scattering

Zhenjia Wang, Lewis J. Rothberg

Author Affiliations +

Proceedings Volume 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV; 63231D (2006) https://doi.org/10.1117/12.681668
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

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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Zhenjia Wang and Lewis J. Rothberg "Conformations of single chains of conjugated polymers by plasmon-enhanced Raman scattering", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 63231D (3 October 2006); https://doi.org/10.1117/12.681668

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