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HL: Fachverband Halbleiterphysik

HL 78: Graphene: Preparation and characterization I (O, jointly with HL, TT)

HL 78.3: Vortrag

Donnerstag, 14. März 2013, 11:00–11:15, H17

Graphene-enhanced versus Surface-enhanced Raman Scattering — •Fatemeh Yaghobian, Tobias Korn, and Christian Schüller — Institute of Experimental and Applied Physics University of Regensburg D-93040 Regensburg, Germany

Graphene-enhanced Raman scattering (GERS) is emerging as an important method due to the need for highly reproducible, quantifiable and biocompatible active substrates. As a result of its unique two dimensional carbon structure, graphene provides particularly large enhanced Raman signals of molecules at its surface. In this work, it is demonstrated that graphene works as active substrate for enhanced Raman scattering and has a great potential in biosensing because of its ability to quench interfering fluorescence. Obtained GERS signals of different molecules with reproducible enhancement factors are discussed and compared with surface-enhanced Raman scattering (SERS) signals on highly active substrates, covered with spherical silver nanoparticles. We have also observed an upshift in the frequency of the breathing mode of a test molecule, when adsorbed on graphene, in contrast to measurements on silver nanoparticles, where the frequencies remain unchanged.