Journal ArticleDOI
Fibre optic chemical sensors based on evanescent wave interactions in sol-gel-derived porous coatings
B. D. Mac Craith,Colette McDonagh,Gerard O'Keeffe,T. Butler,Brendan C. O'Kelly,John F. McGilp +5 more
TLDR
In this paper, a simple low-cost technique for fabricating reagent-mediated fiber-optic chemical sensors (optrodes) is described and the performance of a range of such sensors is reported.Abstract:
A simple, low-cost technique for fabricating reagent-mediated fibre-optic chemical sensors (optrodes) is described and the performance of a range of such sensors is reported. The technique is based on coating an unclad portion of an optical fibre with a microporous glass film prepared by the sol-gel process. Although tip- and side-coating are both possible with this technique, the latter, which employs evanescent wave interactions, offers particular advantages in terms of sensor performance, control of sensitivity and quality of coating. The sol-gel-derived film is used to provide a robust support matrix in which analyte-sensitive dyes are entrapped and into which smaller analyte molecules may diffuse. The benefits of this sol-gel approach to sensor fabrication are illustrated by results from a range of sensors for pH, ammonia and oxygen based on both evanescent wave absorption and evanescent wave excitation of fluorescence.read more
Citations
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Journal ArticleDOI
Organically modified sol-gel sensors
Ovadia Lev,Michael Tsionsky,L. Rabinovich,Victor Glezer,Srinivasan Sampath,Irena Pankratov,Jenny Gun +6 more
TL;DR: Sol-gel techniques can be used to make biosensors, waveguide sensors, and modified electrodes in a variety of configurations as discussed by the authors, and they can also be applied to make modified electrodes.
Journal ArticleDOI
Sol-gel processes
TL;DR: In this paper, the authors describe the development of functionalized coatings, optical devices, chemical sensors and even biosensors using the sol-gel process for the powderless processing of glasses and ceramics.
Journal ArticleDOI
Fiber optic sensing of liquid refractive index
Argha Banerjee,Sayak Mukherjee,Rishi Kumar Verma,Biman Jana,Tapan Kumar Khan,Mrinmoy Chakroborty,Rahul K. Das,Sandip Biswas,Ashutosh Saxena,Vandana Singh,Rakesh Mohan Hallen,Ram Swarup Rajput,Paramhans Tewari,Satyendra Kumar,Vishal Saxena,Anjan K. Ghosh,Joseph John,Pinaki Gupta-Bhaya +17 more
TL;DR: In this article, an optical fiber, partially stripped of its cladding is shown to sense refractive index of a liquid in which the uncladded sensing region is immersed, to a high degree of precision and over a wide range of refractive indices.
Journal ArticleDOI
Optical chemical sensors based on sol-gel materials: Recent advances and critical issues
TL;DR: The use of the sol-gel process to produce materials for optical chemical sensors and biosensors is attracting considerable interest as discussed by the authors, mainly due to the design flexibility and the ease of fabrication.
Journal ArticleDOI
Fiber-optic oxygen sensor based on the fluorescence quenching of tris (5-acrylamido, 1,10 phenanthroline) ruthenium chloride
TL;DR: In this article, a modified ruthenium phenanthroline complex which is suitable for acryl co-polymerization with acrylamide was used as a matrix support.
References
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Journal ArticleDOI
Doped sol-gel glasses as chemical sensors
TL;DR: In this paper, it is reported that by trapping suitable analytical reagents, porous sol-gel glasses can be used for the preparation of a wide variety of chemical-sensing materials, based on the observation that a substantial fraction of the trapped molecules is exposed to the liquid or gaseous intra-pore volume.
Journal ArticleDOI
Fibre optic oxygen sensor based on fluorescence quenching of evanescent-wave excited ruthenium complexes in sol–gel derived porous coatings
Brian D. MacCraith,Colette McDonagh,Gerard O'Keeffe,Emmetine T. Keyes,Johannes G. Vos,Brendan C. O'Kelly,John F. McGilp +6 more
TL;DR: In this article, a simple low-cost technique for the fabrication of optical sensors for oxygen is described and preliminary results obtained using these sensors are reported The technique is based on coating a declad portion of an optical fibre with a microporous glass film prepared by the sol-gel process.
Journal ArticleDOI
Optical waveguide sensor using evanescent wave excitation of fluorescent dye in sol-gel glass
TL;DR: In this paper, an unclad fiber was dipcoated with a thin layer of porous cladding within which a pH-sensitive dye was entrapped, and the performance of the pH sensor was reported and the potential of the technique for distributed and integrated optic sensing was discussed.
Journal ArticleDOI
Single fibre optic fluorescence pH probe
TL;DR: In this article, a probe configuration used in this study for pH measurement consists of fluorescein isothiocyanate (FITC) covalently bonded to a porous glass bead.
Journal ArticleDOI
Enhanced evanescent wave sensors based on sol-gel-derived porous glass coatings
TL;DR: In this article, a novel approach is proposed whereby porous sol-gel glass coatings are used to enhance the performance of both types of evanescent wave sensor, and the particular advantages obtained by applying the technique to a pH sensor based on dye fluorescence and a methane gas sensor using infrared absorption are presented.