A Single-Point, Multiparameter, Fiber Optic Sensor Based on a Combination of Interferometry and LSPR

Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar

doi:10.1109/jlt.2018.2791722

Cited by 21 publications

(18 citation statements)

References 23 publications

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“…The total MZFP signal was subtracted by the low frequency MZ signal (found by using Fourier transform based algorithms) to extract the FP signal. The optical length changes of the different hydrogel swelling equilibriums were computed by using an autocorrelation function to estimate the free spectral range (FSR) as performed in [7]. The total MZFP signal was filtered for the high frequency FP signal by using the estimated FSR as a reference frequency in the Fourier transform algorithms.…”

Section: Fig 2 Overview Over the Components Used In The Of Setupmentioning

confidence: 99%

Combining interferometric sensors for dual parameter fiber optic chemical sensing

Muri

Hammarling

Wahl

et al. 2018

26th International Conference on Optical Fiber Sensors

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Section: Fig 2 Overview Over the Components Used In The Of Setupmentioning

confidence: 99%

Combining interferometric sensors for dual parameter fiber optic chemical sensing

Muri

Hammarling

Wahl

et al. 2018

26th International Conference on Optical Fiber Sensors

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“…We have in earlier work developed proof-of-concepts of fiber optic (FO) sensors based on using NMNPs immobilized in polyacrylamide hydrogels and combining LSPR and interferometric sensing modalities [25,[50][51][52][53]. The interferometric sensing modality detects the change in volume of a stimuli-responsive hydrogel, whereas the LSPR sensing modality detects receptor-analyte recombinations on the NMNP surface.…”

Section: Introductionmentioning

confidence: 99%

“…The dipole-dipole coupling and RI sensitivity of the LSPR in NMNPs may as well be utilized for detecting the change in volume of stimuli-responsive hydrogels for significant swelling and deswelling. The LSPR response of spherical or spheroidal gold nanoparticles (GNP) in hydrogels has shown to deviate from the LSPR response of randomly distributed spherical or spheroidal GNPs [51][52][53]. The plasmon coupling between spherical GNPs occurred for an interparticle distance that was larger than the estimated plasmon coupling distance [51].…”

Section: Introductionmentioning

confidence: 99%

“…Here, the morphology of 10 wt % polyacrylamide (AAM-BIS) and poly(acrylamide-co-acrylic acid) (AAM-AAC-BIS) hydrogels, with and without gold nanorods (GNRs) as composite materials, was studied using conventional SEM. Low GNR densities were used (10/µm 3 ) as for the earlier FO sensor studies in [51][52][53]. The hydrogels were prepared for SEM using CPD or the drying with HMDS and characterized concerning pore structures and GNR positions in the polymer network.…”

Section: Introductionmentioning

confidence: 99%

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Mapping Nanoparticles in Hydrogels: A Comparison of Preparation Methods for Electron Microscopy

2018

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The distribution of noble metal nanoparticles (NMNPs) in hydrogels influences their nanoplasmonic response and signals used for biosensor purposes. By controlling the particle distribution in NMNP-nanocomposite hydrogels, it is possible to obtain new nanoplasmonic features with new sensing modalities. Particle positions can be characterized by using volume-imaging methods such as the focused ion beam-scanning electron microscope (FIB-SEM) or the serial block-face scanning electron microscope (SBFSEM) techniques. The pore structures in hydrogels are contained by the water absorbed in the polymer network and may pose challenges for volume-imaging methods based on electron microscope techniques since the sample must be in a vacuum chamber. The structure of the hydrogels can be conserved by choosing appropriate preparation methods, which also depends on the composition of the hydrogel used. In this paper, we have prepared low-weight-percentage hydrogels, with and without gold nanorods (GNRs), for conventional scanning electron microscope (SEM) imaging by using critical point drying (CPD) and hexamethyldisilazane (HMDS) drying. The pore structures and the GNR positions in the hydrogel were characterized. The evaluation of the sample preparation techniques elucidate new aspects concerning the drying of hydrogels for SEM imaging. The results of identifying GNRs positioned in a hydrogel polymer network contribute to the development of mapping metal particle positions with volume imaging methods such as FIB-SEM or SBFSEM for studying nanoplasmonic properties of NMNP-nanocomposite hydrogels.

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“…We have in earlier work developed proof-of-concepts fiber optic (FO) sensors based on using NMNPs immobilized in polyacrylamide hydrogels and based on combining LSPR and interferometric sensing modalities [41][42][43]. Here, the interferometric sensing modality detects the change in volume of a stimuli-responsive hydrogel whereas the LSPR sensing modality detects receptor-analyte recombinations on the NMNP surface.…”

Section: Introductionmentioning

confidence: 99%

Mapping the Distribution of Particles in Hydrogel in Use for Nanoplasmonic Biosensors: A Comparison of Preparation Methods

Muri¹,

Hoang²,

Dr³

2018

Preprint

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The distribution of noble metal nanoparticles in hydrogels are influencing their nanoplasmonic response and signal used for biosensor purposes. By controlling the particle distribution, it is possible to obtain new nanoplasmonic features with new sensing modalities. Particle distributions can be characterized by using volume-imaging methods such as the focused ion beam-scanning electron microscope (FIB-SEM) and the serial block-face scanning electron microscopy (SBFSEM) techniques . Since the pore structure of hydrogels is contained by the water absorbed in the polymer network it may pose challenges for volume-imaging based on electron microscope techniques since the sample must be in a vacuum chamber. The structure of hydrogels can be conserved by choosing appropriate preparation methods, which also depends on the composition of the hydrogel used. In this paper, we have prepared low-weight percentage hydrogels, with and without gold nanorods (GNR) for conventional SEM imaging by using two different drying techniques; (1) the critical point drying (CPD) technique and (2) hexamethyldisilazane (HMDS) drying of hydrogels. A qualitative characterization of the GNR-hydrogels was carried out to study the GNRs positioned in the polymer network. The effect of the two different drying methods on the hydrogel morphology were also compared. The use of HMDS as an alternative to the CPD has several advantages involving less parametrical variables for drying, involving less effort, being cost-effective, and requires no equipment use. In addition, choosing an optimized sample preparation method for SEM with optimized imaging parameters is highly important for obtaining accurate information about materials that is not correlated to artifacts. Hence, the results obtained from the preparation methods and SEM imaging parameters in this paper are useful for developing methods for mapping the metal particle distributions in micro-hydrogels by using FIB-SEM and SBFSEM techniques.

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A Single-Point, Multiparameter, Fiber Optic Sensor Based on a Combination of Interferometry and LSPR

Cited by 21 publications

References 23 publications

Combining interferometric sensors for dual parameter fiber optic chemical sensing

Combining interferometric sensors for dual parameter fiber optic chemical sensing

Mapping Nanoparticles in Hydrogels: A Comparison of Preparation Methods for Electron Microscopy

Mapping the Distribution of Particles in Hydrogel in Use for Nanoplasmonic Biosensors: A Comparison of Preparation Methods

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