Bottom, Top, or in Between: Combining Plasmonic Nanohole Arrays and Hydrogel Microgels for Optical Fiber Sensor Applications

Polley, Nabarun; Werner, P.; Balderas‐Valadez, Ruth Fabiola; Pacholski, Claudia

doi:10.1002/admi.202102312

Cited by 5 publications

(9 citation statements)

References 43 publications

(62 reference statements)

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“…NHAs used in this study were fabricated by a bottom-up method on a glass substrate and then transferred to the fiber tip using a strategy described in previous publications. , A representative SEM image of an NHA is shown in Figure b. The detailed size distribution and lattice constant were calculated based on images captured across three batches ( n = 9) with at least three samples from each batch and are shown in Figure S1.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Optical fibers (JTFLH100010351400) from Laser Components GmbH (Olching, Germany) were used as sensor fibers for this study. The preparation process for NHA 11 and NP 23 sensors is described in detail in previous reports. Optical fibers were cleaved and polished to a length of ∼14 cm (NOVA NV-100 manufacturer, Krell Technologies Inc. New Jersey, United States; supplier, AMS Technologies AG, Martinsried, Germany), and one end of the fiber was immersed in a piranha solution (3:1 concentrated H 2 SO 4 (96%) (Sigma-Aldrich):H 2 O 2 (30%) (Merck KGaA), v:v; note that piranha solution is explosive and can cause severe skin burns) overnight.…”

Section: Methodsmentioning

confidence: 99%

“…The NP sensor was fabricated by transferring the polyNIPAM monolayer to the fiber tip by dip coating and then depositing the NHA on top. 23 The NP sensor was dried at room temperature for further experiments.…”

Section: Methodsmentioning

confidence: 99%

“…Another heat treatment step was performed in a hot air oven (Thermo Scientific Heraeus Function Line 110 L) at 80 °C for 1 h to ensure a strong bond between the gold and the fiber surface via the amino group of the silane molecule. The NP sensor was fabricated by transferring the polyNIPAM monolayer to the fiber tip by dip coating and then depositing the NHA on top . The NP sensor was dried at room temperature for further experiments.…”

Section: Methodsmentioning

confidence: 99%

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Photothermomechanical Nanopump: A Flow-Through Plasmonic Sensor at the Fiber Tip

et al. 2022

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Optical fibers equipped with plasmonic flow sensors at their tips are fabricated and investigated as photothermomechanical nanopumps for the active transport of target analytes to the sensor surface. The nanopumps are prepared using a bottom-up strategy: i.e., by sequentially stacking a monolayer of a thermoresponsive polymer and a plasmonic nanohole array on an optical fiber tip. The temperature-dependent collapse and swelling of the polymer is used to create a flow-through pumping mechanism. The heat required for pumping is generated by exploiting the photothermal effect in the plasmonic nanohole array upon irradiation with laser light (405 nm). Simultaneous detection of analytes by the plasmonic sensor is achieved by monitoring changes in its optical response at longer wavelengths (∼500–800 nm). Active mass transport by pumping through the holes of the plasmonic nanohole array is visualized by particle imaging velocimetry. Finally, the performance of the photothermomechanical nanopumps is investigated for two types of analytes, namely nanoscale objects (gold nanoparticles) and molecules (11-mercaptoundecanoic acid). In the presence of the pumping mechanism, a 4-fold increase in sensitivity was observed compared to the purely photothermal effect, demonstrating the potential of the presented photothermomechanical nanopumps for sensing applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Photothermomechanical Nanopump: A Flow-Through Plasmonic Sensor at the Fiber Tip

et al. 2022

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“…Indeed, hydrogels have already been utilized at fiber tips and fiber claddings and as Bragg grating and long periodic fiber grating. 31,33,34 Hydrogels have been integrated with several nanomaterials to exploit various optical sensing principles as passive sensors, i.e., change in the refractive index or transmission window, surface plasmon resonance (SPR), 35 localized surface plasmon resonance (LSPR), 36 Bragg grating sensor, 37 interferometry, 38 and fluorescence technique. 39 Although the number of efforts on integrating hydrogels with optical fibers has been surging in recent years, this field has never been reviewed extensively and hence a comprehensive look into the literature can benefit both new researchers and those who have been guiding the field.…”

Section: Introductionmentioning

confidence: 99%

Hydrogel-integrated optical fiber sensors and their applications: a comprehensive review

et al. 2023

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Multimodal Biomedical Implant with Plasmonic and Simulated Body Temperature Responses

Mingot

Benejam

Víllora

et al. 2023

Macromolecular Bioscience

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This work presents a novel nanoparticle‐based thermosensor implant able to reveal the precise temperature variations along the polymer filaments, as it contracts and expands due to changes in the macroscale local temperature. The multimodal device is able to trace the position and the temperature of a polypropylene mesh, employed in abdominal hernia repair, by combining plasmon resonance and Raman spectroscopy with hydrogel responsive system. The novelty relies on the attachment of the biocompatible nanoparticles, based on gold stabilized by a chitosan‐shell, already charged with the Raman reporter (RaR) molecules, to the robust prosthesis, without the need of chemical linkers. The SERS enhanced effect observed is potentiated by the presence of a quite thick layer of the copolymer (poly(N‐isopropylacrylamide)‐co‐poly(acrylamide)) hydrogel. At temperatures above the LCST of PNIPAAm‐co‐PAAm, the water molecules are expulsed and the hydrogel layer contracts, leaving the RaR molecules more accessible to the Raman source. In vitro studies with fibroblast cells reveal that the functionalized surgical mesh is biocompatible and no toxic substances are leached in the medium. The mesh sensor opens new frontiers to semi‐invasive diagnosis and infection prevention in hernia repair by using SERS spectroscopy. It also offers new possibilities to the functionalization of other healthcare products.

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Bottom, Top, or in Between: Combining Plasmonic Nanohole Arrays and Hydrogel Microgels for Optical Fiber Sensor Applications

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admi.202102312.

Cited by 5 publications

References 43 publications

Photothermomechanical Nanopump: A Flow-Through Plasmonic Sensor at the Fiber Tip

Photothermomechanical Nanopump: A Flow-Through Plasmonic Sensor at the Fiber Tip

Hydrogel-integrated optical fiber sensors and their applications: a comprehensive review

Multimodal Biomedical Implant with Plasmonic and Simulated Body Temperature Responses

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