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Sensors 2017, 17(12), 2723; https://doi.org/10.3390/s17122723

LSPR Coupling and Distribution of Interparticle Distances between Nanoparticles in Hydrogel on Optical Fiber End Face

Department of Electronic Systems, Norwegian University of Science and Technology, Gunnerus gate 1, 7012 Trondheim, Norway
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Received: 30 September 2017 / Revised: 16 November 2017 / Accepted: 20 November 2017 / Published: 25 November 2017
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing)
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Abstract

We report on a new localized surface plasmon resonance (LSPR)-based optical fiber (OF) architecture with a potential in sensor applications. The LSPR-OF system is fabricated by immobilizing gold nanoparticles (GNPs) in a hydrogel droplet polymerized on the fiber end face. This design has several advantages over earlier designs. It dramatically increase the number nanoparticles (NP) available for sensing, it offers precise control over the NP density, and the NPs are positioned in a true 3D aqueous environment. The OF-hydrogel design is also compatible with low-cost manufacturing. The LSPR-OF platform can measure volumetric changes in a stimuli-responsive hydrogel or measure binding to receptors on the NP surface. It can also be used as a two-parameter sensor by utilizing both effects. We present results from proof-of-concept experiments exploring the properties of LSPR and interparticle distances of the GNP-hydrogel OF design by characterizing the distribution of distances between NPs in the hydrogel, the refractive index of the hydrogel and the LSPR attributes of peak position, amplitude and linewidth for hydrogel deswelling controlled with pH solutions. View Full-Text
Keywords: reflection-based FO systems; smart hydrogel; LSPR coupling; nanoplasmonics; point dipole model; Mie scattering; proof-of-concept; interparticle distance distribution; pH sensor reflection-based FO systems; smart hydrogel; LSPR coupling; nanoplasmonics; point dipole model; Mie scattering; proof-of-concept; interparticle distance distribution; pH sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Muri, H.I.; Hjelme, D.R. LSPR Coupling and Distribution of Interparticle Distances between Nanoparticles in Hydrogel on Optical Fiber End Face. Sensors 2017, 17, 2723.

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