Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.65: Poster
Mittwoch, 16. März 2011, 17:30–21:00, P4
Fabrication and Application of Nanostructured Substrates for Surface Enhanced Raman Spectroscopy — •Sabrina Darmawi, Limei Chen, Torsten Henning, and Peter J. Klar — I. Physikalisches Institut, Justus-Liebig-Universität, Heinrich-Buff-Ring 16, 35392 Giessen
Detecting single nanoparticles or small concentrations of particles within a chemical complex has become more and more important. With the application of manufactured nanoparticles, such as oxides, in our daily products, concerns about our safety and their impact on us increase. In order to detect metal oxides, such as ZnO or TiO2, a greatly sensitive approach of detection is necessary. With surface enhanced Raman Spectroscopy (SERS) the weak Raman signal can be amplified considerably. This can be achieved by a pattern of rhomb arrays that are transferred on a silicon substrate via electron beam lithography. As an alternative pathway to the subtractive method, the additive technique (lift-off) is used by evaporating silver or gold layers on the developed structure. Interactions between the analyte and the metallic lateral tip nanostructured surface lead to plasmonic excitations which cause a high electromagnetic field enhancement at the tips of the rhombs. For purposes of testing, engineered nanoparticles such as ZnO are deposited on the structured substrate. The resulting system is investigated by SERS and we will report on the dependence of the Raman signal on the tip parameters.