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- W3201524626 abstract "Thin metallic films on dielectric nanospheres are demonstrated to have a high potential for fabrication of cost-effective SERS substrates. In addition to the morphological advantages that nanospheres offer for attaining a high density of hot-spots, possessing shape adjustability by uncomplicated thermal treatment make them an attractive platform for tuneable SERS substrates. Furthermore, when combined with oblique angle metal deposition technique, adjustable gaps at a high density and adjustable shape of metal films, such as Ag films, can be achieved on nanospheres. Applying small changes in deposition angle can provide means for fine adjustment of the Raman enhancement factor (EF), resulting in EF up to 108 measured using crystal violet dye molecule as a Raman analyte. This practice paves the way for the fabrication of high EF SERS substrates at a reasonable cost using a monolayer of self-organized nanosphere pattern. An ultra-thin Ag film coated at 5o tilt is shown to be an excellent substitute for a film deposited at 0o with double the thickness. There is a strong agreement between the experimental results and finite-elements-method based Maxwell simulations exhibiting expected field enhancements up to 109 at a tilt angle of 5o." @default.
- W3201524626 created "2021-09-27" @default.
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- W3201524626 date "2021-10-06" @default.
- W3201524626 modified "2023-10-11" @default.
- W3201524626 title "Shape and deposition angle control of silver film-over-nanosphere SERS substrates" @default.
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- W3201524626 doi "https://doi.org/10.1088/1361-6528/ac2765" @default.
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