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• W4200202260 abstract "Abstract In this work, a simple two-step method to create tunable self-assembled three-dimensional nanostructure array-like nanoantennas directly on the tip of an optical quartz glass fiber is described. The structures are prepared by using dry etching of the fiber tip. For the etching process, gold nanoparticles fabricated by thermal dewetting technique were used as template. The structures are applied as sensors for label-free analysis of organic substances in ppb range, such as drug residues in liquid solutions. The measurements are carried out by a portable Raman device with an exchangeable sensor head utilizing the SERS-effect. This method allows in situ applications. In order to characterize the SERS cells, para-thiocresol and diclofenac sodium are used as model substances. For optimization of the substrate performance, different thicknesses of the dewetting-layer (6, 9, 12 nm), different etching times for formation of the pillars (6, 8, 10 and 12 min), and different thicknesses of SERS-metallization (25, 50, 75 nm) of gold and silver are compared. In order to show the applicability of the structure on the tip of a fiber, measurements from the upper side and from the underside of the substrate on quartz plates are compared. Reproducible SERS enhancement factors up to <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msup> <m:mrow> <m:mn>10</m:mn> </m:mrow> <m:mrow> <m:mn>7</m:mn> </m:mrow> </m:msup> </m:math> {10^{7}} were achieved." @default.
• W4200202260 created "2021-12-31" @default.
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• W4200202260 date "2021-12-16" @default.
• W4200202260 modified "2023-09-27" @default.
• W4200202260 title "Tunable nanopillar array on a quartz-fiber tip for surface enhanced Raman scattering (SERS) detection" @default.
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• W4200202260 doi "https://doi.org/10.1515/teme-2021-0093" @default.
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