Accueil > articulos > Exploring the surface-enhanced Raman scattering (SERS) activity of gold nanostructures embedded around nanogaps at wafer scale: Simulations and experiments
Resumen: A unique way of converting free space light into a local electromagnetic field in small spaces is via metallic nanostructuring. In this work fabrication, experimental characterization and simulation of surface-enhanced Raman scattering (SERS) active specimens based on Au nanostructures are discussed. We used displacement Talbot lithography (DTL) to fabricate silicon nano-wedge substrates with Au nanostructures embedded around their apices. After the ion beam etching process, a nanogap is introduced between two Au nanostructures templated over nano-wedges, yielding specimens with SERS characteristics. The Au nanostructures and the nanogaps have symmetric and asymmetric configurations with respect to the wedges. With this nanofabrication method, various wafer-scale specimens were fabricated with highly controllable nanogaps with a size in the order of 6 nm for symmetric gaps and 8 nm for asymmetric gaps. SERS characteristics of these specimens were analyzed experimentally by calculating their analytical enhancement factor (AEF). According to finite-difference time-domain (FDTD) simulations, the Raman enhancement arises at the narrow gap due to plasmonic resonances, yielding a maximum AEF of 6.9 × 106. The results highlight the SERS activity of the nanostructures and ultimately comply with reliable substrates for practical applications. Idioma: Inglés DOI: 10.1016/j.apmt.2023.101929 Año: 2023 Publicado en: Applied Materials Today 35 (2023), 101929 [12 pp.] ISSN: 2352-9407 Factor impacto JCR: 7.2 (2023) Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 85 / 438 = 0.194 (2023) - Q1 - T1 Factor impacto SCIMAGO: 1.623 - Materials Science (miscellaneous) (Q1)