Geodesic
SERS substrates based on opal films with gold coating
Nanosistemy: fizika, himiâ, matematika, Tome 15 (2024) no. 6, pp. 902-909.

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Substrates for Surface-Enhanced Raman Spectroscopy (SERS) were fabricated by gold sputtering onto surface of synthetic opal films and their characteristics were studied at wavelengths $\lambda$ = 532 and 785 nm. Synthetic opal films were fabricated by self-assembly of spherical SiO$_2$ particles on vertical substrates. It was found that at the concentration of the analyte methylene blue equal to 10$^{-5}$ M the intensity of SERS at the wavelength of 785 nm increased with increasing amount of sputtered gold up to a certain optimal thickness exceeding 35 nm, while at the concentration of 10$^{-6}$ M this dependence was not observed. It is assumed that this is due to the complex amount-dependent morphology of the sputtered gold coating and the presence of “hot spots” of different strengths. For the best samples at a wavelength of $\lambda$ = 785 nm, the SERS enhancement factor was of 7 $\cdot$ 10$^4$ and a detection limit for methylene blue reached 3 $\cdot$ 10$^{-7}$ M that exceeds the results published for similar substrates previously. The SERS parameters obtained for $\lambda$ = 532 nm were less attractive, despite the additional enhancement due to this wavelength was at the edge of the photonic stop-band.
Keywords: silica opal, gold coating, Surface-Enhanced Raman spectroscopy. 
@article{NANO_2024_15_6_a16,
     author = {Mikhail O. Astafurov and Elena V. Perevedentseva and Nikolay N. Mel'nik and Alexander Y. Baranchikov and Sergey G. Dorofeev and Alexander A. Ezhov and Anastasia V. Grigor'eva and Sergey O. Klimonsky},
     title = {SERS substrates based on opal films with gold coating},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {902--909},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2024_15_6_a16/}
}
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%A Elena V. Perevedentseva
%A Nikolay N. Mel'nik
%A Alexander Y. Baranchikov
%A Sergey G. Dorofeev
%A Alexander A. Ezhov
%A Anastasia V. Grigor'eva
%A Sergey O. Klimonsky
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%J Nanosistemy: fizika, himiâ, matematika
%D 2024
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Mikhail O. Astafurov; Elena V. Perevedentseva; Nikolay N. Mel'nik; Alexander Y. Baranchikov; Sergey G. Dorofeev; Alexander A. Ezhov; Anastasia V. Grigor'eva; Sergey O. Klimonsky. SERS substrates based on opal films with gold coating. Nanosistemy: fizika, himiâ, matematika, Tome 15 (2024) no. 6, pp. 902-909. http://geodesic.mathdoc.fr/item/NANO_2024_15_6_a16/