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|
Identifier |
000451429 |
Title |
Fiber-optic chemo-sensors for perfluorinated substances sensing |
Alternative Title |
Οπτικές ίνες, χημικοί αισθητήρες, οπτικά φράγματα Μπραγκ, φθωριούχες ενώσεις |
Author
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Σαρακατσιάνος, Βασίλειος Ν.
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Thesis advisor
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Πισσαδάκης, Σταύρος
|
Reviewer
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Κομίνης, Ιωάννης
Ηλιόπουλος, Ελευθέριος
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Abstract |
From packaging in food industry to medicine and even warfare, per- and polyfluoroalkyl substances find a wide use of applications in our lives. Due to their high
chemical and thermal stability, fluorine compounds are commonly used in cooking
utensils and the automobile industry as surfactants to waterproof ceramic/metal
surfaces.
However, their high stability makes them very resistant to biological degradation, which results in their bioaccumulation in ground water and living organisms.
A means to accurately monitor the concentrations of such chemical compounds is
necessary to assure general public health and protect the environment.
In this master thesis, a fiber-optic chemo-sensor for perfluorinated substance
sensing is presented. A tilted optical fiber Bragg grating was inscribed in a SMF28 optical fiber and was overlaid with a P(VDF-TrFE-CTFE) polymer film, acting as
a transduction layer. The sensor was tested using two different perfluorinated chemicals, trifluorethanol vapors and perfluorooctanoic acid aqueous solutions. Concentrations of said substances, as low as 2 ppm, were able to be detected. A study of the
sensor’s sensitivity depending on the P(VDF-TrFE-CTFE) polymer film’s structural
phase (amorphous, crystalline, thermally poled) is also presented. The basic theory
regarding its principle of operation and the stages of its development are laid out.
|
Language |
English |
Subject |
Bragg gratings |
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Optical fibers |
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Οπτικά φράγματα Μπραγκ |
|
Οπτικές ίνες |
|
Φθωριούχες ενώσεις |
|
Χημικοί αισθητήρες |
Issue date |
2022-11-25 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/b/c/d/metadata-dlib-1664951260-816293-26804.tkl
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Views |
498 |