Fibre-Optic Chemical Sensor Approaches Based on Nanoassembled Thin Films: A Challenge to Future Sensor Technology

Korposh, Sergiy; James, Stephen W.; Tatam, Ralph P.; Lee, Seung-Woo

doi:10.5772/53399

Cited by 13 publications

(11 citation statements)

References 54 publications

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“…The PAH/SiO2 layers were deposited in three steps as illustrated in Figure 1 [24]. First, the unclad surface of the POF is placed within the Teflon holder.…”

Section: Sensor Fabricationmentioning

confidence: 99%

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Gómez

Morgan

Hayes-Gill

et al. 2018

Sensors and Actuators B: Chemical

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The sensitivity of a low-cost polymeric optical fibre humidity sensor based on transmittance changes due to evanescent wave absorption is reported using test measurements in an environmental chamber and of the skin. The layer-by-layer method was used to coat 30mm of the central unclad section of a multimode polymeric optical fibre with 7 layers of a hydrophilic film consisting of bilayers of poly(allylamine hydrochloride) and SiO2 mesoporous nanoparticles. Sensor characterisation shows a decrease in light transmission as relative humidity increases as a result of refractive index changes of the coating deposited onto the optical fibre which correlates with a commercial capacitive humidity sensor. The sensitivity obtained for the sensor coated with an optimum 7 layers was approximately -3.87x10 -3 and -9.61x10 -3 in transmittance percentage per RH percentage for the range of ~10% to ~75% RH and 90% to 97% RH, respectively. In addition, a response time of 1.5s can be seen for breath monitoring with the polymeric optical fibre humidity sensor. The proof of concept measurements made on the skin indicate that this sensor has the potential to be used to monitor humidity of the skin microenvironment within a wound dressing which can be used to provide better prognosis of healing.

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“…The PAH/SiO2 layers were deposited in three steps as illustrated in Figure 1 [24]. First, the unclad surface of the POF is placed within the Teflon holder.…”

Section: Sensor Fabricationmentioning

confidence: 99%

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Gómez

Morgan

Hayes-Gill

et al. 2018

Sensors and Actuators B: Chemical

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“…Therefore, the fundamental mode is only measured in the taper waist segment. The measurement theory of the mechanisms is based on the analytestimulated optical change in the transmission field of the coated optical fiber [8].…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the transmission loss is very nearly insignificant as a result of the low energy of the excited high-order modes [7] Therefore, the fundamental mode is only measured in the taper waist segment. The measurement theory of the mechanisms is based on the analyte-stimulated optical change in the transmission field of the coated optical fiber [8]. With the aim to increase the sensitivity of the sensor, the tapered optical fiber needs to be coated with nanostructured materials [9], as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Optical based relative humidity sensor using tapered optical fiber coated with graphene oxide

Mohamed

Hussin

Ahmad³

et al. 2016

AIP Conference Proceedings

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A tapered silica optical fiber (SOF) coated with graphene oxide is proposed and demonstrated as a humidity sensor. In order to reduce the diameter of the optical fiber from 125 μm to 26.9 μm as the sensing region, the flamebrushing technique was used to taper the fiber with the tapering length is about 30 mm. To increase the optical sensitivity, the tapered region was coated with graphene oxide, which will interact with the changes of humidity and affect the evanescent field in the tapered region. In this work, the proposed optical sensor works in the range of the humidity from 40% to 60%. The comparison was made between uncoated tapered fiber with the graphene oxide coated optical fiber and the experimental works reveal that the tapered fiber coated with graphene oxide gave better result compared to bare tapered optical fiber. It is showed that the tapered SOF with graphene oxide enables to increase the sensitiveness of the fiber to sense relative humidity.

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“…The LbL coating process enables surface-functionalizability, which is useful in color identification and site-selective immobilization of encapsulated cells into optical devices. The LbL coating process has been studied for the deposition of nanomaterials such as magnetic nanoparticles that facilitated cell separation by a magnetic field and functional coating of optical fibers [ 218 ].…”

Section: Immobilization Of Biologicals For Fobsmentioning

confidence: 99%

Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors

Pospı́šilová

Kuncová

Trögl

2015

Sensors

164

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This review summarizes principles and current stage of development of fiber-optic chemical sensors (FOCS) and biosensors (FOBS). Fiber optic sensor (FOS) systems use the ability of optical fibers (OF) to guide the light in the spectral range from ultraviolet (UV) (180 nm) up to middle infrared (IR) (10 µm) and modulation of guided light by the parameters of the surrounding environment of the OF core. The introduction of OF in the sensor systems has brought advantages such as measurement in flammable and explosive environments, immunity to electrical noises, miniaturization, geometrical flexibility, measurement of small sample volumes, remote sensing in inaccessible sites or harsh environments and multi-sensing. The review comprises briefly the theory of OF elaborated for sensors, techniques of fabrications and analytical results reached with fiber-optic chemical and biological sensors.

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Fibre-Optic Chemical Sensor Approaches Based on Nanoassembled Thin Films: A Challenge to Future Sensor Technology

Cited by 13 publications

References 54 publications

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Optical based relative humidity sensor using tapered optical fiber coated with graphene oxide

Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors

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