Publication detail

Surface functionalization of a chalcogenide IR photonic sensor by means of a polymer membrane for water pollution remediation

Year: 2024

Type of publication: článek v odborném periodiku

Name of source: Analyst

Publisher name: Royal Society of Chemistry

Place: Cambridge

Page from-to: 4723-4735

Titles:

Language	Name	Abstract	Keywords
cze	Povrchová funkcionalizace chalkogenidového IR fotonického senzoru pomocí polymerní membrány pro sanaci znečištění vody	Rychlá a současná detekce organických chemických znečišťujících látek ve vodě je důležitým problémem, který je třeba vyřešit pro ochranu lidského zdraví. Tato studie zkoumala možnost vývoje in situ opakovaně použitelného optického senzoru schopného selektivního měření s využitím chalkogenidového senzoru doplněného hydrofobní polymerní membránou s detekcí založenou na evanescentních vlnách ve středním infračerveném spektru. Aby se optimalizoval polyisobutylenový hydrofobní film nanesený na chalkogenidovém vlnovodu, byl použit hranol ZnSe jako testovací lože pro provádění ATR FTIR. Aby byly splněny úrovně uvedené ve zdravotních pokynech, byl cílový rozsah detekce v této studii udržován poměrně nízký, s rozsahem koncentrací rozšířeným od 50 ppb do 100 ppm, aby pokryl problémy s náhodným znečištěním, zatímco cílené uhlovodíky (benzen, toluen a xylen) byly stále detekovány v koncentraci 100 ppb.	detekce BTX; FTIR; ATR
eng	Surface functionalization of a chalcogenide IR photonic sensor by means of a polymer membrane for water pollution remediation	Rapid, simultaneous detection of organic chemical pollutants in water is an important issue to solve for protecting human health. This study investigated the possibility of developing an in situ reusable optical sensor capable of selective measurements utilizing a chalcogenide transducer supplemented by a hydrophobic polymer membrane with detection based on evanescent waves in the mid-infrared spectrum. In order to optimise a polyisobutylene hydrophobic film deposited on a chalcogenide waveguide, a zinc selenide prism was utilized as a testbed for performing attenuated total reflection with Fourier-transform infrared spectroscopy. To comply with the levels mentioned in health guidelines, the target detection range in this study was kept rather low, with the concentration range extended from 50 ppb to 100 ppm to cover accidental pollution problems, while targeted hydrocarbons (benzene, toluene, and xylene) were still detected at a concentration of 100 ppb. Infrared measurements in the selected range showed a linear behaviour, with the exception of two constantly reproducible plateau phases around 25 and 80 ppm, which were observable for two polymer film thicknesses of 5 and 10 mu m. The polymer was also found to be reusable by regenerating it with water between individual measurements by increasing the water temperature and flow to facilitate reverse exchange kinetics. Given the good conformability of the hydrophobic polymer when coated on chalcogenide photonic circuits and its demonstrated ability to detect organic pollutants in water and to be regenerated afterwards, a microfluidic channel utilising water flow over an evanescent wave optical transducer based on a chalcogenide waveguide and a polyisobutylene (PIB) hydrophobic layer deposited on its surface was successfully fabricated from polydimethylsiloxane by filling a mold prepared via CAD and 3D printing techniques. Optimisation of the functionalisation of infrared chalcogenide sensors for accidental water poll	organic pollutants; hydrocarbons; spectroscopy; temperature

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