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Malinovskis U, Popļausks R, Jurkevičiu̅tė A, Dutovs A, Berzins K, Perkanuks V, Simka W, Muiznieks I, Erts D, Prikulis J. Optimization of Colloidal Gold Nanoparticles on Porous Anodic Aluminum Oxide Substrates for Refractometric Sensing. ACS Omega 2022; 7:40324-40332. [PMID: 36385891 PMCID: PMC9648095 DOI: 10.1021/acsomega.2c05305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 10/14/2022] [Indexed: 06/16/2023]
Abstract
A new composite metal-insulator-metal (MIM) system consisting of exceptionally dense non-close-packed (NCP) arrays of gold or silver nanoparticles, porous anodic aluminum oxide (PAAO), and bulk aluminum substrate interacts strongly with visible light and may become a very useful component for optical applications. The proposed MIM structure can be synthesized using accessible lithography-free chemical and physical processes (anodization and capillary force assisted colloidal particle deposition) that are suitable for the low-cost production of specialized devices. Here, we present a systematic study to determine the essential MIM structure parameters (nanoparticle size and PAAO layer thickness) for localized surface plasmon resonance (LSPR) refractometric sensing. A performance comparison was done by recording the spectra of scattered light upon angled illumination in media with different refractive indices. A clear advantage for maximizing the signal to background ratio was observed in the case of 60 and 80 nm Au nanoparticles with a PAAO thickness in a narrow range between 300 and 375 nm. Sensitivity exceeding a 200 nm peak wavelength shift per refractive index unit was found for 60 nm Au nanoparticles on approximately 500-nm-thick PAAO. The experimental observations were supported by finite-difference time-domain (FDTD) simulations.
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Affiliation(s)
- Uldis Malinovskis
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Raimonds Popļausks
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Aušrinė Jurkevičiu̅tė
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Aleksandrs Dutovs
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Karlis Berzins
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Vladislavs Perkanuks
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Wojciech Simka
- Faculty
of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland
| | - Indrikis Muiznieks
- Faculty
of Biology, University of Latvia, 1 Jelgavas Str., Riga LV-1004, Latvia
| | - Donats Erts
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
- Faculty
of Chemistry, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
| | - Juris Prikulis
- Institute
of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
- Faculty
of Physics, Mathematics, and Optometry, University of Latvia, 3 Jelgavas Str., Riga LV-1004, Latvia
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