Electrospun nanofiber mats for evanescent optical fiber sensors

Urrutia, Aitor; Goicoechea, Javier; Rivero, Pedro J.; Matı́as, Ignacio R.; Arregui, Francisco J.

doi:10.1016/j.snb.2012.10.009

Cited by 38 publications

(23 citation statements)

References 27 publications

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“…[ 46,47 ] The most common optical sensors take the form of optical fi bers coated with a reactive material, which changes the confi nement of the mode in response to RH. [ 33,47,51 ] These designs have response times ranging from 10 ms [ 48 ] to 0.5 min [ 49 ] and have resolutions up to 0.01%RH across a broad range. [ 33,47 ] In recent years, there has been a concerted drive to produce sensing elements that can be integrated with nano-and microscale optical circuitry, to comply with lab-on-a-chip devices and other emerging technologies.…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Powell

Coles

Taylor

et al. 2016

Advanced Optical Materials

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of interest and be as sensitive as possible to small changes in the local environment. While individual particle resonances can be effectively tuned through size, shape and material choice, [ 2,12 ] coupled modes between two or more nanoparticles have been shown to exhibit far greater electric fi eld enhancements and produce more sensitive detectors. [13][14][15][16][17][18] However, these are extremely diffi cult to fabricate, with many top-down lithographic and FIBbased examples being unrealistic for scaling up, and bottom-up techniques that generally produce randomly oriented particle pairs with no control over the alignment, which is key as the resonances of such dimers are highly sensitive to the polarization of incident illumination. Henzie et al. made some important progress in this fi eld by using a gravity-driven technique to assemble nanoparticles in shallow pits in a substrate, which allows excellent control over orientation and positioning of any number of particle sets. [ 19 ] Another elegant solution to the fabrication problem is the placement of a metallic particle above a metal sheet separated by a thin spacer. A "mirror particle" is excited in the metal plane, which produces a strong coupling effect without having to align two separate particles, drastically simplifying the production process. [ 22 ] There is a growing body of work investigating the properties of silver nanocubes (NCs) above metal fi lms, to tune their scattering properties, [ 21 ] produce controlled-refl ectance surfaces, [ 22 ] and to control and enhance the radiative processes of fl uorophores within the spacer material, [ 23,24 ] as well as theoretical studies looking to build a complete description of the structure. [ 25,26 ] This system can be considered an optical patch antenna, where gap plasmon modes are supported between the metal sheet and the NC. [ 21 ] The resonant modes of these antennae are extremely sensitive to the properties of the spacer layer separating the NC and the silver sheet, and any environmental changes that infl uence the refractive index (RI), or more importantly the thickness of the chosen material will produce signifi cant changes in the plasmon resonance. As long as spacer materials which expand in response to a given analyte are available, this design can be utilized to detect any number of chemicals. This forms the basis for a new type of sensor, which can operate equally well in a gaseous or liquid setting (depending on spacer choice) and that is scalable from the sub-wavelength scale (the footprint of one nanocube) up to a large-surface area metamaterial.In this paper, we demonstrate the operation of the nanocube patch antenna system as a gas sensor for the fi rst time, usingThe ability of individual nanocube patch antennas, consisting of a silver nanocube separated from an Ag sheet by a thin fl uoropolymer spacer, to act as subwavelength sensing elements is demonstrated. An increase in relative humidity (RH) causes the spacer to expand, which alters the resonance of the plasmon cavity mode fo...

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Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Powell

Coles

Taylor

et al. 2016

Advanced Optical Materials

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“…As the solution travels in air, due to the electric forces, the solvent is evaporated during the flight of the fibers and finally, the ENFs are deposited on the ground screen collector or the substrate to be coated (see Figure 4a). In this case, an optical fiber core has been coated with ENFs, as can be observed in Figure 4b, the design of novel optical fiber sensors being able to monitor physical or chemical parameters (relative humidity, pH, gases or human breathing) [36]. As will be commented upon in the following section related to functional applications of nanostructured coatings, these optical fiber sensors based on ENFs show a very fast response time, being a critical parameter in the field of sensors market [37].…”

Section: Electrospinning Processmentioning

confidence: 99%

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

et al. 2018

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This review reports the implementation of novel nanostructured functional coatings by using different surface engineering techniques based on wet chemistry. In the first section, the theoretical fundaments of three techniques such as sol-gel process, layer-by-layer (LbL) assembly and electrospinning will be briefly described. In the second section, selected applications in different potential fields will be presented gathering relevant properties such as superhydrophobicity, biocide behavior or applications in the field of optical fiber sensors.

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“…There are basically two operating mechanisms for the fabrication of fiber optic RH sensors. One is based on using specific technologies to form porous sensing structures, such as sputtering [4], electro-spinning [5], electron evaporation [6], or layer-by-layer nano-assembly [7,8]. The other type of RH fiber optic sensors involves using humidity sensitive coatings or gels (hydrophilic materials) on the surface or end face of the optical fiber, such as polyvinyl alcohol [9,10], polyethylene glycol [11], chitosan [12,13], polyethylene oxide [14], graphene oxide [15], metallic oxide film [15,16], agar [17][18][19][20] and indium tin oxide [21,22].…”

Section: Introductionmentioning

confidence: 99%

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

2018

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In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.Coatings 2018, 8, 453 2 of 9 and desorb water, and also to restore a fast equilibrium with atmospheric humidity. Besides that, it is extremely stable, not soluble in water and can be easily handled for device manufacture [23,31].In this work, a multimode interferometer based on a coreless fiber coated with agarose gel is proposed for the detection of RH. The sensor is easy to produce, presents good resolution, particularly for environments with values of RH higher than 60.0%RH. Sensor Fabrication and Operation Principle

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Electrospun nanofiber mats for evanescent optical fiber sensors

Cited by 38 publications

References 27 publications

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

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