SERS of Isotopically Labeled C-12/C-13 Graphene Bilayer-Gold Nanostructured Film Hybrids: Graphene Layer as Spacer and SERS Probe

0482703 - ÚFCH JH 2018 RIV US eng J - Journal Article
Ek Weis, Johan - da Costa, Sara - Frank, Otakar - Fridrichová, Michaela - Vlčková, B. - Vejpravová, Jana - Kalbáč, Martin
SERS of Isotopically Labeled C-12/C-13 Graphene Bilayer-Gold Nanostructured Film Hybrids: Graphene Layer as Spacer and SERS Probe.
Journal of Physical Chemistry C. Roč. 121, č. 21 (2017), s. 11680-11686. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA ČR(CZ) GA15-01953S; GA MŠMT LL1301; GA MŠMT(CZ) LM2015073
Institutional support: RVO:61388955 ; RVO:68378271
Keywords : Enhanced Raman spectroscopy * surface * fluorination
OECD category: Physical chemistry; Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impact factor: 4.484, year: 2017

Single layer graphene (SLG) is envisaged to improve significantly the substrates for surface-enhanced Raman scattering of planar aromatic molecules as it can ensure a more even enhancement at different places of the substrate. For this purpose, the role of SLG as a spacer in such SERS platforms has to be addressed. Here, we report preparation and Raman spectral probing of hybrid systems constituted by 13 C/ 12 C bilayer graphene covered by 15 nm thick nanostructured gold. Hybrids with both the 13 C over 12 C layers and in the flipped geometry, and with both the turbostratic and the A-B stacked order have been investigated, and qualitative as well as quantitative information about the enhancement experienced by phonons of the individual graphene layers by the electromagnetic mechanism (EM) of SERS were obtained. In hybrids system under study, the top layer of the isotopically labeled bilayer graphene represents the SLG spacer, while the bottom layer mimics a monolayer of target planar aromatic molecules. Importantly, both the calculation and the experiment based chiefly on comparison of the relative intensity ratio of the clearly distinguished 13 C layer and 12 C layer G mode bands jointly indicate that the enhancement of Raman scattering of the molecular monolayer on SLG spacer by the EM mechanism of SERS will be only 0.7 times lower than that of a monolayer located directly on the nanostructured Au surface.
Permanent Link: http://hdl.handle.net/11104/0278105