Combined Au/Ag nanoparticle creation in ZnO nanopillars by ion implantation for optical response modulation and photocatalysis

[Display omitted] •Ag, Au-nanoparticles were embedded into ZnO nanopillars by ion implantation.•Nanoparticles exhibited extraordinary optical absorbance in a broad wavelength range.•Optical analyses shown bi-metallic character of nanoparticles.•ZnO nanopillar morphology was modified with the increas...

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Published in:	Applied surface science Vol. 610; p. 155556
Main Authors:	Macková, A., Jagerová, A., Lalik, O., Mikšová, R., Poustka, D., Mistrík, J., Holý, V., Schutter, J.D., Kentsch, U., Marvan, P., Azarov, A., Galeckas, A.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-02-2023
Subjects:	Au/Ag nanoparticles, ion implantation doped ZnO nanostructures SPR ZnO nanopillars ZnO nanopillars doped ZnO nanostructures SPR Au/Ag nanoparticles, ion implantation
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Summary:	[Display omitted] •Ag, Au-nanoparticles were embedded into ZnO nanopillars by ion implantation.•Nanoparticles exhibited extraordinary optical absorbance in a broad wavelength range.•Optical analyses shown bi-metallic character of nanoparticles.•ZnO nanopillar morphology was modified with the increased ion implantation fluence.•Photocatalytic properties of doped ZnO nanopillars were investigated. ZnO nanopillars were implanted with Au-400 keV and Ag-252 keV ions with ion fluences from 1 × 1015 cm−2 to 1 × 1016 cm−2. We compared ZnO nanopillars solely implanted with Au-ions and dually-implanted with Au and Ag-ions. Rutherford Back-Scattering spectrometry (RBS) confirmed Ag and Au embedded in ZnO nanopillar layers in a reasonable agreement with theoretical calculations. A decreasing thickness of the ZnO nanopillar layer was evidenced with the increasing ion implantation fluences. Spectroscopic Ellipsometry (SE) showed a decrease of refractive index in the nanopillar parts with embedded Au, Ag-ions. XRD discovered vertical domain size decreasing with the proceeding radiation damage accumulated in ZnO nanopillars which effect was preferably ascribed to Au-ions. SE and diffuse reflectance spectroscopy (DRS) showed optical activity of the created nanoparticles at wavelength range 500 – 600 nm and 430 – 700 nm for the Au-implanted and Au, Ag-implanted ZnO nanopillars, respectively. Photoluminescence (PL) features linked to ZnO deep level emission appear substantially enhanced due to plasmonic interaction with metal nanoparticles created by Ag, Au-implantation. Photocatalytic activity seems to be more influenced by the nanoparticles presented in the layer rather than the surface morphology. Dual implantation with Ag, Au-ions enhanced optical activity to a larger extent without significant morphology deterioration as compared to the solely Au-ion implanted nanopillars.
Bibliography:	NFR/295864
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2022.155556