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

Materials

Gloria Gottardi¹  Valerii Myndrul²  Igor Iatsunskyi²  Emerson Coy²  Mariusz Jancelewicz²  Mykola Pavlenko² 

[1] Fondazione Bruno Kessler, Center for Materials and Microsystems IRST, Via Sommarive 18, 38123 Trento, Italy;NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61‑614 Poznan, Poland;

关键词: porous silicon;    zinc oxide;    atomic layer deposition;    biosensors;    photoluminescence;   

DOI  :  10.3390/ma13081987

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown