Optical Fiber Humidity Sensors Using Nanostructured Coatings of SiO$_{2}$ Nanoparticles

Corres, Jesús M.; Matı́as, Ignacio R.; Hernáez, Miguel; Bravo, J.

doi:10.1109/jsen.2008.917487

Cited by 79 publications

(41 citation statements)

References 24 publications

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“…These nanostructured coatings make possible an enhancement in the response time as well as in the resultant sensitivity [114][115][116][117][118][119][120][121]. In addition, the presence of nanoparticles in these sensitive thin films has resulted in the design of high-performance fiber-optic sensors due to the inherent properties of the nanoparticles such as high surface area ratio and porosity [122][123][124][125][126]. Among them, the use of metallic nanoparticles for sensing applications is of great interest due to the presence of strong absorption bands in the visible region, known as Localized Surface Plasmon Resonances (LSPR) [127].…”

Section: Optical Fiber Sensorsmentioning

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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Section: Optical Fiber Sensorsmentioning

confidence: 99%

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

et al. 2018

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“…This way, if this coating is made of a material which thickness or refractive index is sensitive to humidity changes, the reflected power will represent these variations in the relative humidity of the surrounding medium. For example, in [21], an optical fiber humidity sensor based on SiO 2 nanoparticles is presented. It shows a good sensitivity and really fast rise and fall times, improving previous humidity sensors that used polymeric coatings [22].…”

Section: Interferometric Nano-cavitiesmentioning

confidence: 99%

Nanostructured Materials in Optical Fiber Sensing

Hernáez¹

2013

TOOPTSJ

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This work comprehends a review of nanostructured materials employed in the fabrication of optical fiber sensors in the last years. The continuous advances in nanofabrication techniques have enabled to manipulate the matter precisely producing well defined nanostructurated coatings or repetitive patterns at nanoscale level. The interactions of light with these nano-organized materials or patterns at the nanoscale level enable to observe interesting phenomena, such as interferometry, fluorescence, absorbance, resonances and many others which can be exploited in the fabrication of sensing devices. A particular case consists of optical fiber sensors, where the light travelling through an optical fiber interacts with the sensitive layer. The properties of the sensitive layer, such as the organization, physical properties, chemical bounds etc. will determine the sensing characteristics of the final device. The utilization of some of the most common nanostructured materials, such as polymers, nanoparticles, metals, metal oxides or biological coatings are reviewed here.

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“…Corres et al [12] first demonstrated a humidity sensor at the tip of an optical fibre based on a multilayer hydrophilic film comprised of layers of SiO 2 nanoparticles with alternating pH. Through tests conducted using a humidity chamber, the sensor was demonstrated to have low hysteresis and fast response time.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to Corres et al [12], this work uses PAH, a highly hydrophilic polycation layer, to assemble a SiO 2 thin film. The PAH layer increases the sensitivity of the sensor due to high hydrophilicity and also reduces the number of the deposited layers, thus increasing the efficiency of the fabrication procedure.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Use of a Fiber Optic Sensor Based on PAH/SiO₂ Film for Humidity Sensing in Ventilator Care Equipment

Hernández

Morgan

Hayes-Gill

et al. 2016

IEEE Trans. Biomed. Eng.

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The user has requested enhancement of the downloaded file. IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING 1 Abstract-Objective: To develop a compact probe that can be used to monitor humidity in ventilator care equipment. A mesoporous film of alternate layers of Poly(allylamine hydrochloride) (PAH) and silica (SiO 2 ) nanoparticles (bilayers), deposited onto an optical fibre was used. The sensing film behaves as a Fabry-Perot cavity of low-finesse where the absorption of water vapour changes the optical thickness and produces a change in reflection proportional to humidity. Methods: The mesoporous film was deposited upon the cleaved tip of an optical fibre using the layer-by-layer method. The sensor was calibrated in a bench model against a commercially available capacitive sensor. The sensitivity and response time were assessed in the range from 5 % relative humidity (RH) to 95 %RH for different numbers of bilayers up to a maximum of nine. Results: The sensitivity increases with the number of bilayers deposited; sensitivity of 2.28 mV/%RH was obtained for nine bilayers. The time constant of the response was 1.13 s ± 0.30 s which is faster than the commercial device (measured as 158 s). After calibration, the optical fibre humidity sensor was utilised in a bench top study employing a mechanical ventilator. The fast response time enabled changes in humidity in individual breaths to be resolved. Conclusion: Optical fibre sensors have the potential to be used to monitor breath to breath humidity during ventilator care. Significance: Control of humidity is an essential part of critical respiratory care and the developed sensor provides a sensitive, compact and fast method of humidity monitoring.Index Terms-Humidity sensor, relative humidity, FabryPerot, layer-by-layer (LbL), intensive care unit, critical care, optical fibre sensor.

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Optical Fiber Humidity Sensors Using Nanostructured Coatings of SiO$_{2}$ Nanoparticles

Cited by 79 publications

References 24 publications

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Nanostructured Materials in Optical Fiber Sensing

Characterization and Use of a Fiber Optic Sensor Based on PAH/SiO₂ Film for Humidity Sensing in Ventilator Care Equipment

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Optical Fiber Humidity Sensors Using Nanostructured Coatings of SiO$_{2}$ Nanoparticles

Cited by 79 publications

References 24 publications

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Nanostructured Materials in Optical Fiber Sensing

Characterization and Use of a Fiber Optic Sensor Based on PAH/SiO2 Film for Humidity Sensing in Ventilator Care Equipment

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Product

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Characterization and Use of a Fiber Optic Sensor Based on PAH/SiO₂ Film for Humidity Sensing in Ventilator Care Equipment