title: Frequency shift in graphene-enhanced Raman signal of molecules.
abstract: 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 for molecules adsorbed on its surface. In this work, the GERS signals of a test molecule, 4-mercaptobenzoic acid (4-MBA), with reproducible enhancement factors are discussed and compared with surface-enhanced Raman scattering (SERS) signals from highly active substrates, covered with spherical silver nanoparticles. It is shown that chemical interactions between the molecule and graphene can result in a frequency shift in the graphene-enhanced Raman signal of the molecule.
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany. Fatemeh.Yaghobian@physik.uni-regensburg.de
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Yaghobian
authors.forename: Tobias
authors.initials: T
authors.lastname: Korn
authors.forename: Christian
authors.initials: C
authors.lastname: Schüller