Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.3: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Influence of gold nanoparticle distributions on SERS enhancement factors — •Thomas Sander1, Hongmei Liu2, Xinping Zhang2, and Peter J. Klar1 — 1I. Physikalisches Institut, Justus-Liebig-Universität Giessen — 2College of Applied Sciences, Beijing University of Technology
Surface enhanced Raman spectroscopy (SERS) of metallic nanostructured substrates can provide Raman intensities increased by several orders of magnitude making even the detection of single molecules possible. Two different mechanisms contribute to the enhancement of the Raman signals: The electromagnetic enhancement is due to excited surface plasmons of the metal structure causing locally increased electromagnetic fields. The chemical enhancement is due to various effects, e.g. the chemical interaction between the molecules and the surface.
Here we present Raman spectra of rhodamine 6G on gold nanostructures fabricated by solution processible gold nanoparticles on Si substrates. The properties of the gold nanostructures can easily be varied by annealing at different temperatures as shown by AFM and SEM. A gold coordinate grid on the Si substrate allows one to correlate the recorded Raman spectra with the AFM and SEM measurements. Thus the influence of the gold nanoparticle distribution on the signal enhancement is accessible in detail. Raman spectra will be discussed with respect to different excitation lasers and polarizations as well as the achieved enhancements with respect to the local environment of the gold nanoparticles. COMSOL simulations of the enhancement factors will be compared with the experimental results.