E-Locus - Institutional Repository of the University of Crete

Home Collections School/Department School of Sciences and Engineering Department of Physics Post-graduate theses

Post-graduate theses

Search command : Author="Στρατάκης" And Author="Εμμανουήλ"

Current Record: 28 of 291

[Add to Basket]

Identifier

000451429

Title

Fiber-optic chemo-sensors for perfluorinated substances sensing

Alternative Title

Οπτικές ίνες, χημικοί αισθητήρες, οπτικά φράγματα Μπραγκ, φθωριούχες ενώσεις

Author

Σαρακατσιάνος, Βασίλειος Ν.

Thesis advisor

Πισσαδάκης, Σταύρος

Reviewer

Κομίνης, Ιωάννης
Ηλιόπουλος, Ελευθέριος

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

Optical fibers

Οπτικά φράγματα Μπραγκ

Οπτικές ίνες

Φθωριούχες ενώσεις

Χημικοί αισθητήρες

Issue date

2022-11-25

Collection