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Facile and Low-Cost Fabrication of SiO2-Covered Au Nanoislands for Combined Plasmonic Enhanced Fluorescence Microscopy and SERS.

ABSTRACT: An easy and low-cost way to fabricate monometallic Au nanoislands for plasmonic enhanced spectroscopy is presented. The method is based on direct thermal evaporation of Au on glass substrates to form nanoislands, with thicknesses between 2 and 15 nm, which are subsequently covered by a thin layer of silicon dioxide. We have used HR-SEM and AFM to characterize the nanoislands, and their optical transmission reveals strong plasmon resonances in the visible. The plasmonic performance of the fabricated substrates has been tested in fluorescence and Raman scattering measurements of two probe materials. Enhancement factors up to 1.8 and 9×104 are reported for confocal fluorescence and Raman microscopies, respectively, which are comparable to others obtained by more elaborated fabrication procedures.

SUBMITTER: Vidal A 

PROVIDER: S-EPMC10574186 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature

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Facile and Low-Cost Fabrication of SiO<sub>2</sub>-Covered Au Nanoislands for Combined Plasmonic Enhanced Fluorescence Microscopy and SERS.

Vidal Alejandro A   Molina-Prados Sergio S   Cros Ana A   Garro Núria N   Pérez-Martínez Manuel M   Álvaro Raquel R   Mata Gadea G   Megías Diego D   Postigo Pablo A PA  

Nanomaterials (Basel, Switzerland) 20231008 19

An easy and low-cost way to fabricate monometallic Au nanoislands for plasmonic enhanced spectroscopy is presented. The method is based on direct thermal evaporation of Au on glass substrates to form nanoislands, with thicknesses between 2 and 15 nm, which are subsequently covered by a thin layer of silicon dioxide. We have used HR-SEM and AFM to characterize the nanoislands, and their optical transmission reveals strong plasmon resonances in the visible. The plasmonic performance of the fabrica  ...[more]

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