We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Bulk-suppressed and surface-sensitive Raman scattering by transferable plasmonic membranes with irregular slot-shaped nanopores.
- Authors
Wyss, Roman M.; Kewes, Günter; Marabotti, Pietro; Koepfli, Stefan M.; Schlichting, Karl-Philipp; Parzefall, Markus; Bonvin, Eric; Sarott, Martin F.; Trassin, Morgan; Oezkent, Maximilian; Lu, Chen-Hsun; Gradwohl, Kevin-P.; Perrault, Thomas; Habibova, Lala; Marcelli, Giorgia; Giraldo, Marcela; Vermant, Jan; Novotny, Lukas; Frimmer, Martin; Weber, Mads C.
- Abstract
Raman spectroscopy enables the non-destructive characterization of chemical composition, crystallinity, defects, or strain in countless materials. However, the Raman response of surfaces or thin films is often weak and obscured by dominant bulk signals. Here we overcome this limitation by placing a transferable porous gold membrane, (PAuM) on the surface of interest. Slot-shaped nanopores in the membrane act as plasmonic antennas and enhance the Raman response of the surface or thin film underneath. Simultaneously, the PAuM suppresses the penetration of the excitation laser into the bulk, efficiently blocking its Raman signal. Using graphene as a model surface, we show that this method increases the surface-to-bulk Raman signal ratio by three orders of magnitude. We find that 90% of the Raman enhancement occurs within the top 2.5 nm of the material, demonstrating truly surface-sensitive Raman scattering. To validate our approach, we quantify the strain in a 12.5 nm thin Silicon film and analyze the surface of a LaNiO3 thin film. We observe a Raman mode splitting for the LaNiO3 surface-layer, which is spectroscopic evidence that the surface structure differs from the bulk. These results validate that PAuM gives direct access to Raman signatures of thin films and surfaces. Characterizing surfaces by Raman spectroscopy is limited by the competition of surface and bulk Raman responses. Here the authors use nanoporous plasmonic membranes to enhance surface Raman signals while suppressing bulk contributions.
- Subjects
RAMAN scattering; NANOPORES; SILICON films; PLASMONICS; THIN films; RAMAN spectroscopy
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49130-2