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High-Density Plasmonic Nanoparticle Arrays Deposited on Nanoporous Anodic Alumina Templates for Optical Sensor Applications
Institute of Chemical Physics, University of Latvia, Riga, Latvia.
Institute of Chemical Physics, University of Latvia, Riga, Latvia.
Institute of Chemical Physics, University of Latvia, Riga, Latvia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
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2019 (English)In: Nanomaterials, E-ISSN 2079-4991, Vol. 9, no 4, article id 531Article in journal (Refereed) Published
Abstract [en]

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

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 4, article id 531
Keywords [en]
porous anodic aluminum oxide, colloid deposition, plasmonics, nanoparticle arrays, hemoglobin, SERS
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-73457DOI: 10.3390/nano9040531ISI: 000467768800047PubMedID: 30987127Scopus ID: 2-s2.0-85065477772OAI: oai:DiVA.org:ltu-73457DiVA, id: diva2:1302625
Note

Validerad;2019;Nivå 2;2019-04-05 (johcin)

Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-06-25Bibliographically approved

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Ramser, Kerstin

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