Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 45: Poster: Two Dimensional Functional Materials

CPP 45.5: Poster

Mittwoch, 9. März 2016, 18:15–21:00, Poster B2

Graphene-Enhanced Optical Spectroscopy of Molecular Nano SystemsBita Rezania1, •Philipp Lange1, Nikolai Severin1, Janina Kneipp2, and Jürgen P. Rabe11Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin — 2Department of Chemistry, Humboldt-Universität zu Berlin

Graphene enhanced Raman Spectroscopy (GERS) is a newly emerged field. That is, Raman cross sections of molecules located in a close proximity to graphene has been demonstrated to be increased. However, the mechanism of the Raman enhancement in GERS is still not well understood. We investigated GERS on rhodamine 6G (R6G) molecules and we demonstrate a GERS enhancement factor for R6G confined between graphene and mica of about an order of magnitude. To get further insight into the GERS mechanism, we deposited CdTe quantum dots (QD) on top of graphene which covered R6G molecules. The presence of QD on top of graphene results in further enhancement of R6G Raman peaks confined between graphene and mica. The enhancement factor is different for different Raman peaks of R6G. Possible interpretations will be discussed

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