An experimental study about hydrogels for the fabrication of optical fiber humidity sensors

Arregui, Francisco J.; Ciaurriz, Zuri; Oneca, M.; Matı́as, Ignacio R.

doi:10.1016/s0925-4005(03)00520-3

Cited by 96 publications

(52 citation statements)

References 23 publications

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“…4b). [27][28][29] Both dried films (nanotube-gel composite and ordinary agarose gel) are not destroyed even when rubbed with a cotton gauze, and continue to stick strongly with the slide glass (Fig. 4c), whereas the as-produced nanotube-gel composite without drying is readily destroyed when rubbed with a gauze.…”

mentioning

confidence: 99%

“…4d). [27][28][29] In addition, we consider that gel composites are strongly attached onto the surface of the glass substrate by multipoint adsorption of nanocomponents (gel networks and SDS-SWNT complexes) with various interactions such as van der Waals force, ionic force, and hydrophobic interaction. [10][11][12] We do not discuss the mechanism of adhesion of nanotube gel-composite to glass in detail in this report because the mechanism, which involves numerous molecules such as agarose, SDS, SWNT, and water, is overly complicated.…”

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confidence: 99%

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Micropatterned Carbon Nanotube–Gel Composite as Photothermal Material

Miyako¹,

Nagata²,

Hirano³

et al. 2009

Advanced Materials

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confidence: 99%

mentioning

confidence: 99%

Micropatterned Carbon Nanotube–Gel Composite as Photothermal Material

Miyako¹,

Nagata²,

Hirano³

et al. 2009

Advanced Materials

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“…Experimental measurement of humidity inside chamber was carried out with the coated microsphere by observing one of the resonance wavelengths of the micro resonator under the influence of a controlled humidity variation. The sensing mechanism of Agarose gel is based on the swelling behavior of the Agarose gel upon adsorption of water vapors with an increase of ambient humidity [15]. As shown in Fig 4(a), an increase of humidity inside the chamber gives rise to the adsorption of more water vapors on the surface of the microsphere.…”

Section: Experimental Investigation and Discussionmentioning

confidence: 99%

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator

Mallik¹,

Liu²,

Kavungal³

et al. 2017

SPIE Proceedings

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Compact humidity sensor based on a multi-layer ABSTRACTIn this paper we report on a novel approach to implementing a compact humidity sensor that utilizes whispering gallery mode (WGM) phenomena in a silica microsphere coated with Agarose hydrogel. The spectral positions of the WGM resonances for such a sensor depend strongly on the refractive index and thickness of the coating. The WGM's spectral shift occurs due to adsorption/desorption of the water vapor in response to changes in ambient humidity and also due to the corresponding changes of the coating thickness. We experimentally investigated the WGMs spectral shift for a 100 µm diameter silica microsphere coated with Agarose hydrogel over a wide range of relative humidity (RH) values from 30%RH to 70%RH at a constant temperature. Six dip coating cycles of 2.25% wt. /vol. Agarose hydrogel were carried out in sequence with a characterization of the sensor performed for each coating thickness. A resonance shift of 16 nm is achieved in our experiment for the six-layer Agarose hydrogel coating sensor.

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“…Simplicity and reproducibility are the most remarkable advantages offered by this method respect to other deposition techniques employed to implement optical fibre sensors such as, for example, dip coating [15][16][17] or Langmuir-Blodgett [18].…”

Section: Ivnanosensor Implementation a Layer By Layer Methodsmentioning

confidence: 99%

Detection of Volatile Organic Compounds Based on Optical Fibre using Nanostructured Films

Elosúa

Matı́as

Bariain

et al. 2008

International Journal on Smart Sensing and Intelligent Systems

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Abstract-An optical fibre sensor for detection of volatile organic compounds (VOCs) has been implemented. This device is based on a vapochromic material presented in the form of bright red powders, which suffers reversible changes in its optical properties when exposed to some organic vapours. The sensor head consists of a nano interferometer doped with the vapochromic material, built onto a cleaved ended multimode optical fibre by using the Layer by Layer Electrostatic Self Assembly Method (LbL). A reflection scheme was used, so the intensity modulated reflected signal is registered in order to study its response. Changes up to 3 dB in the reflected optical power were measured.

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An experimental study about hydrogels for the fabrication of optical fiber humidity sensors

Cited by 96 publications

References 23 publications

Micropatterned Carbon Nanotube–Gel Composite as Photothermal Material

Micropatterned Carbon Nanotube–Gel Composite as Photothermal Material

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator

Detection of Volatile Organic Compounds Based on Optical Fibre using Nanostructured Films

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