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Article

Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications

1
NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland
2
Fondazione Bruno Kessler, Center for Materials and Microsystems IRST, Via Sommarive 18, 38123 Trento, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(8), 1987; https://doi.org/10.3390/ma13081987
Received: 27 March 2020 / Revised: 17 April 2020 / Accepted: 22 April 2020 / Published: 24 April 2020
(This article belongs to the Special Issue Multifunctional Nanostructured Silicon Composites)
In the current research, a porous silicon/zinc oxide (PSi/ZnO) nanocomposite produced by a combination of metal-assisted chemical etching (MACE) and atomic layer deposition (ALD) methods is presented. The applicability of the composite for biophotonics (optical biosensing) was investigated. To characterize the structural and optical properties of the produced PSi/ZnO nanocomposites, several studies were performed: scanning and transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance, and photoluminescence (PL). It was found that the ALD ZnO layer fully covers the PSi, and it possesses a polycrystalline wurtzite structure. The effect of the number of ALD cycles and the type of Si doping on the optical properties of nanocomposites was determined. PL measurements showed a “shoulder-shape” emission in the visible range. The mechanisms of the observed PL were discussed. It was demonstrated that the improved PL performance of the PSi/ZnO nanocomposites could be used for implementation in optical biosensor applications. Furthermore, the produced PSi/ZnO nanocomposite was tested for optical/PL biosensing towards mycotoxins (Aflatoxin B1) detection, confirming the applicability of the nanocomposites. View Full-Text
Keywords: porous silicon; zinc oxide; atomic layer deposition; biosensors; photoluminescence porous silicon; zinc oxide; atomic layer deposition; biosensors; photoluminescence
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MDPI and ACS Style

Pavlenko, M.; Myndrul, V.; Gottardi, G.; Coy, E.; Jancelewicz, M.; Iatsunskyi, I. Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications. Materials 2020, 13, 1987. https://doi.org/10.3390/ma13081987

AMA Style

Pavlenko M, Myndrul V, Gottardi G, Coy E, Jancelewicz M, Iatsunskyi I. Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications. Materials. 2020; 13(8):1987. https://doi.org/10.3390/ma13081987

Chicago/Turabian Style

Pavlenko, Mykola; Myndrul, Valerii; Gottardi, Gloria; Coy, Emerson; Jancelewicz, Mariusz; Iatsunskyi, Igor. 2020. "Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications" Materials 13, no. 8: 1987. https://doi.org/10.3390/ma13081987

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