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High-Density Plasmonic Nanoparticle Arrays Deposited on Nanoporous Anodic Alumina Templates for Optical Sensor Applications

1
Institute of Chemical Physics, University of Latvia, 19 Raina Blvd., LV-1586 Riga, Latvia
2
Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-97187 Luleå, Sweden
3
Institute of Materials Science, Kaunas University of Technology, 59 K. Baršausko St., LT-51423 Kaunas, Lithuania
4
Department of Chemical and Materials Engineering, Tunghai University, Taichung 40704, Taiwan
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(4), 531; https://doi.org/10.3390/nano9040531
Received: 25 February 2019 / Revised: 26 March 2019 / Accepted: 30 March 2019 / Published: 3 April 2019
(This article belongs to the Special Issue Technology and Applications of Nanoporous Alumina)
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Abstract

This study demonstrates a new, robust, and accessible deposition technique of metal nanoparticle arrays (NPAs), which uses nanoporous anodic alumina (NAA) as a template for capillary force-assisted convective colloid (40, 60, and 80 nm diameter Au) assembly. The NPA density and nanoparticle size can be independently tuned by the anodization conditions and colloid synthesis protocols. This enables production of non-touching variable-density NPAs with controllable gaps in the 20–60 nm range. The NPA nearest neighbor center distance in the present study was fixed to 100 nm by the choice of anodization protocol. The obtained Au NPAs have the resonant scattering maxima in the visible spectral range, with a refractometric sensitivity, which can be tuned by the variation of the array density. The thickness of the NAA layer in an Aluminum-NAA-NPA multilayer system enables further tuning of the resonance frequency and optimization for use with specific molecules, e.g., to avoid absorption bands. Applicability of the mentioned multilayers for colorimetric refractive index (RI) sensing is demonstrated. Their use as Surface-Enhanced Raman Scattering (SERS) substrates is tested using hemoglobin as a biological probe molecule. View Full-Text
Keywords: porous anodic aluminum oxide; colloid deposition; plasmonics; nanoparticle arrays; hemoglobin; SERS porous anodic aluminum oxide; colloid deposition; plasmonics; nanoparticle arrays; hemoglobin; SERS
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Malinovskis, U.; Poplausks, R.; Erts, D.; Ramser, K.; Tamulevičius, S.; Tamulevičienė, A.; Gu, Y.; Prikulis, J. High-Density Plasmonic Nanoparticle Arrays Deposited on Nanoporous Anodic Alumina Templates for Optical Sensor Applications. Nanomaterials 2019, 9, 531.

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