Optical sensors based on polymeric nanofibers layers created by electrospinning

Ponce-Alcántara, Salvador; Martín-Sánchez, David; Pérez-Márquez, Ana; Maudes, Jon; Murillo, N.; García-Rupérez, Jaime

doi:10.1364/ome.8.003163

Cited by 15 publications

(18 citation statements)

References 34 publications

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“…The basis for this method is the chemical modification of electrodes, such as a metal surface and carbon electrodes. In contrast, optical and more specifically amperometric sensors are based on refractive index changes and change of electromagnetic fields to change in the characteristics of light, respectively [125,132].…”

Section: Electrospun Label-free Sensorsmentioning

confidence: 99%

Electrospun Nanofibers for Label-Free Sensor Applications

Aliheidari

Aliahmad

Agarwal

et al. 2019

Sensors

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Electrospinning is a simple, low-cost and versatile method for fabricating submicron and nano size fibers. Due to their large surface area, high aspect ratio and porous structure, electrospun nanofibers can be employed in wide range of applications. Biomedical, environmental, protective clothing and sensors are just few. The latter has attracted a great deal of attention, because for biosensor application, nanofibers have several advantages over traditional sensors, including a high surface-to-volume ratio and ease of functionalization. This review provides a short overview of several electrospun nanofibers applications, with an emphasis on biosensor applications. With respect to this area, focus is placed on label-free sensors, pertaining to both recent advances and fundamental research. Here, label-free sensor properties of sensitivity, selectivity, and detection are critically evaluated. Current challenges in this area and prospective future work is also discussed.

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Section: Electrospun Label-free Sensorsmentioning

confidence: 99%

Electrospun Nanofibers for Label-Free Sensor Applications

Aliheidari

Aliahmad

Agarwal

et al. 2019

Sensors

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“…NFs layers with average diameters between 22 and 40 nm and high porosities were achieved with an electrospinning solution, realized with 6 wt% polyamide 6 (PA6) and 5 wt% pyridine salt. Further details about the fabrication process of these samples can be found in [14]. Then, a thin (~3 nm) gold layer was deposited on top of the NFs layers in order to increase the amplitude of the FP fringes when measuring in aqueous medium.…”

Section: Optical Sensors Based On Electrospun Nanofibers Layersmentioning

confidence: 99%

“…Polymeric NFs layers exhibit many interesting properties that make them ideal candidates to build optical sensing structures, such as a high surface-to-volume ratio, a high porosity, an adjustable pore size, a sponge-like configuration for a better sample infiltration, a low production cost, and the possibility to be manufactured over large areas [12,13]. High sensitivities (close to 1060 nm/RIU (refractive index unit) in the near-infrared range of the spectrum) have been previously demonstrated by our group in a static test consisting of the deposition of a drop of acetone over the porous NFs sample [14]. However, a spectrum drift has been observed when trying to perform real-time sensing measurements.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Polymeric Nanofibers Layers for Use as Real-Time and In-Flow Photonic Sensors

Ponce-Alcántara

Martínez-Pérez

Pérez-Márquez

et al. 2019

Sensors

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In order to increase the sensitivity of a sensor, the relationship between its volume and the surface available to be functionalized is of great importance. Accordingly, porous materials are becoming very relevant, because they have a notable surface-to-volume ratio. Moreover, they offer the possibility to infiltrate the target substances on them. Among other porous structures, polymeric nanofibers (NFs) layers fabricated by electrospinning have emerged as a very promising alternative to low-cost and easy-to-produce high-performance photonic sensors. However, experimental results show a spectrum drift when performing sensing measurements in real-time. That drift is responsible for a significant error when trying to determine the refractive index variation for a target solution, and, because of that, for the detection of the presence of certain analytes. In order to avoid that problem, different chemical and thermal treatments were studied. The best results were obtained for thermal steps at 190 °C during times between 3 and 5 h. As a result, spectrum drifts lower than 5 pm/min and sensitivities of 518 nm/refractive index unit (RIU) in the visible range of the spectrum were achieved in different electrospun NFs sensors.

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“…where m is an integer, d is the layer thickness, and neff is the effective refractive index of the porous layer [6]. When the medium surrounding the porous structure changes (e.g., when flowing a liquid on it), neff changes, and hence, λm shifts.…”

Section: Silicon Substrate To Enhance the Optical Response Of Pcte Mementioning

confidence: 99%

“…Besides PSi, several research groups are also working on other materials, such as polymers [6] or metals [7] for the development of such structures.…”

Section: Introductionmentioning

confidence: 99%

Commercial Polycarbonate Track-Etched Membranes as Optical Chemical Sensors

Martínez-Pérez

García-Rupérez

2018

5th International Electronic Conference on Sensors and Applications

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Refractive index is the main parameter measured by current optical sensors. Among all the photonic structures available for their design, porous materials have become an excellent option, since they provide better sensitivities. In our work, commercially available polycarbonate track-etched membranes were used as porous photonic structures. By means of reflectivity measurements, we demonstrated their capability to detect the presence of ethanol in the medium and showed the possibility of reusing them in several sensing assays. This new material could become an easier-to-obtain and cheaper alternative to current porous materials commonly used in optical sensors for refractive index sensing.

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Optical sensors based on polymeric nanofibers layers created by electrospinning

Cited by 15 publications

References 34 publications

Electrospun Nanofibers for Label-Free Sensor Applications

Electrospun Nanofibers for Label-Free Sensor Applications

Stabilization of Polymeric Nanofibers Layers for Use as Real-Time and In-Flow Photonic Sensors

Commercial Polycarbonate Track-Etched Membranes as Optical Chemical Sensors

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