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Functionalization of chalcogenide IR photonic sensor by polymer membrane for the purpose of detecting aromatic hydrocarbon pollutants in water

Rok: 2023

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

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Jazyk	Název	Abstrakt	Klíčová slova
eng	Functionalization of chalcogenide IR photonic sensor by polymer membrane for the purpose of detecting aromatic hydrocarbon pollutants in water	Due to increasing levels of pollution in water, the need for rapid and accurate detection of life-threatening substances is becoming increasingly urgent. This work focused on the detection of aromatic hydrocarbons due to their highly carcinogenic and genotoxic properties. While sev eral chemical sensors are commercially available for field measurements, they still have short comings due to cost, multiple detection failures, actual portability, and/or reliability. Creating a sensor that would improve these characteristics is the main objective of this paper. Various water solutions containing pollutants were prepared, with concentrations ranging from 50 ppb to 100 ppm. The individual water samples were measured using a Fourier-trans form infrared spectroscopy with an attenuated total reflectance accessory. Various polymers, including polyisobutylene (PIB) and polyhydroxybutyrate-co-hydroxyvalerate from a family of polyhydroxyalkanoates (PHAs), were tested as membranes, responsible for extracting molecules from water. Thin films (in a range of 5–15 µm) from the polymers were prepared on ZnSe prisms and then tested for fabrication reproducibility, analysis time, limit of detection, long-term cycle repeatability and regeneration. For PIB, the thickness of 5 µm was chosen as a compromise between the ability to extract water and the time required to reach saturation of the membrane. The polymer showed ability to measure samples consistently and repeatedly. The detection limit of hydrocarbons was also reduced from 250 ppb to 150 ppb, promising good results in this detection range. The next step will be the transposition of pollutants detection on chalcogenide waveguide with an integrated microfluidic system. For PHAs films, which are considered a biodegradable polymers, the goal was to improve the contact between ZnSe prism and the polymer which had in previous experiments negative effect on the hydrocarbon extraction capacity from the water

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