Optical ammonia sensors based on fluorescent aza-BODIPY dyes- a flexible toolbox.

ABSTRACT: We present three types of optical ammonia sensors suitable for environmental, bioprocess, and reaction monitoring. A respective fluorescent BF₂-chelated tetraarylazadipyrromethene dye (aza-BODIPYs) is physically entrapped in a polyurethane hydrogel (HydroMed D4) forming an emulsion system with vinyl-terminated polydimethylsiloxane (PDMS). The analyte-sensitive layer is covered by a hydrophobic membrane which excludes hydrophilic substances. Three different protection layers are tested, whereby the Teflon and the hydrophobic PES layers outperform a PDMS/TiO₂ layer. Response times within their dynamic range of 15 s can be achieved, whereas the PDMS/TiO₂-covered sensor requires at least 390 s. The three sensors entail the following concentration areas: first s

SUBMITTER: Maierhofer M 

PROVIDER: S-EPMC7533255 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature