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• W2233775407 abstract "Nanofabrication of multifunctional surface-enhanced Raman scattering (SERS) substrates is strongly desirable but currently remains a challenge. The motivation of this study was to design such a substrate, a versatile core-satellite Fe3O4@SiO2-Au (FA) hetero-nanostructure, and demonstrate its use for charge-selective detection of food dye molecules as an exemplary application. Our experimental results and three-dimensional finite difference time domain (FDTD) simulation suggest that tuning the Au nanoparticle (NP) gap to sub-10 nm, which could be readily accomplished, substantially enhanced the Raman signals. Further layer-by-layer deposition of a charged polyelectrolyte on this magnetic SERS substrate induced active adsorption and selective detection of food dye molecules of opposite charge on the substrates. Molecular dynamics (MD) simulations suggest that the selective SERS enhancement could be attributed to the high affinity and close contact (within a 20 Å range) between the substrate and molecules. Density function theory (DFT) calculations confirm the charge transfer from food dye molecules to Au NPs via the polyelectrolytes. This multifunctional SERS platform provides easy separation and selective detection of charged molecules from complex chemical mixtures." @default.
• W2233775407 created "2016-06-24" @default.
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• W2233775407 date "2016-01-26" @default.
• W2233775407 modified "2023-10-18" @default.
• W2233775407 title "Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes" @default.
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• W2233775407 doi "https://doi.org/10.1021/acsami.5b10230" @default.
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• W2233775407 hasPublicationYear "2016" @default.
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