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Letter

Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology

1
Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia
2
Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07745 Jena, Germany
3
Research Campus InfectoGnostics, Philosophenweg 7, 07743 Jena, Germany
4
Leibniz Institute of Photonic Technology, Member of the Leibniz Research Allicance, Leibniz Health Technologies, Albert-Einstein-Straße 9, 07745 Jena, Germany
5
Skolkovo Institute of Science and Technology, Nobel Street 3, 143025 Moscow, Russia
6
Institute for Biological Instrumentation of Russian Academy of Sciences, 142290 Pushchino, Russia
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2020, 20(19), 5634; https://doi.org/10.3390/s20195634
Received: 1 September 2020 / Revised: 28 September 2020 / Accepted: 29 September 2020 / Published: 2 October 2020
(This article belongs to the Collection Biomedical Optical Nanosensors)
The ease of fabrication, large surface area, tunable pore size and morphology as well surface modification capabilities of a porous silicon (PSi) layer make it widely used for sensoric applications. The pore size of a PSi layer can be an important parameter when used as a matrix for creating surface-enhanced Raman scattering (SERS) surfaces. Here, we evaluated the SERS activity of PSi with pores ranging in size from meso to macro, the surface of which was coated with gold nanoparticles (Au NPs). We found that different pore diameters in the PSi layers provide different morphology of the gold coating, from an almost monolayer to 50 nm distance between nanoparticles. Methylene blue (MB) and 4-mercaptopyridine (4-MPy) were used to describe the SERS activity of obtained Au/PSi surfaces. The best Raman signal enhancement was shown when the internal diameter of torus-shaped Au NPs is around 35 nm. To understand the role of plasmonic resonances in the observed SERS spectrum, we performed electromagnetic simulations of Raman scattering intensity as a function of the internal diameter. The results of these simulations are consistent with the obtained experimental data. View Full-Text
Keywords: porous silicon; gold; surface-enhanced Raman scattering; plasmonics; sensorics porous silicon; gold; surface-enhanced Raman scattering; plasmonics; sensorics
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MDPI and ACS Style

Agafilushkina, S.N.; Žukovskaja, O.; Dyakov, S.A.; Weber, K.; Sivakov, V.; Popp, J.; Cialla-May, D.; Osminkina, L.A. Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology. Sensors 2020, 20, 5634. https://doi.org/10.3390/s20195634

AMA Style

Agafilushkina SN, Žukovskaja O, Dyakov SA, Weber K, Sivakov V, Popp J, Cialla-May D, Osminkina LA. Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology. Sensors. 2020; 20(19):5634. https://doi.org/10.3390/s20195634

Chicago/Turabian Style

Agafilushkina, Svetlana N., Olga Žukovskaja, Sergey A. Dyakov, Karina Weber, Vladimir Sivakov, Jürgen Popp, Dana Cialla-May, and Liubov A. Osminkina 2020. "Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology" Sensors 20, no. 19: 5634. https://doi.org/10.3390/s20195634

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