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• W3087593322 startingPage "147915" @default.
• W3087593322 abstract "Nanostructured materials play a significant role in numerous advanced and diversified applications many of which exploit their optical properties. Among these are nanostructured substrates for surface-enhanced Raman scattering (SERS). The objective of our study was to contribute to understanding of topological aspects influencing and underlying SERS on nanostructured substrates. To that purpose we fabricated Ag-decorated Si-nanowires (SiNWs) substrates with different fractal and lacunar characteristics. We demonstrated that fractal dimension and lacunarity have a profound influence on SERS enhancement. We discussed the involved interplay between long-range properties of nanostructured substrate, namely its fractal topology, and short-range local features on a nanometer scale related to the distribution of inter-wire gaps (i.e. lacunarity) which strongly affect the local field enhancement, altogether precipitating in significant increase of SERS. Explanation of a strong correlation found to exist between fractal dimension D, lacunarity and SERS enhancement and the observed abrupt increase of SERS at D ≈ 2.54 are provided within the framework of the percolation theory. For a percolated fractal structure a strong enhancement depends on the excitation wavelength resonantly matching the heterogeneity sizes of inter nanowire gaps as characterized with a high lacunarity determining the distribution of localized optical excitations i.e. hot spots." @default.
• W3087593322 created "2020-09-25" @default.
• W3087593322 creator A5055146705 @default.
• W3087593322 creator A5067177607 @default.
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• W3087593322 date "2021-01-01" @default.
• W3087593322 modified "2023-10-02" @default.
• W3087593322 title "Influence of fractal and lacunar characteristic of a nanostructured substrate on SERS enhancement" @default.
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• W3087593322 doi "https://doi.org/10.1016/j.apsusc.2020.147915" @default.
• W3087593322 hasPublicationYear "2021" @default.
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