title: A highly fluorescent pH sensing membrane for the alkaline pH range incorporating a BODIPY dye.
abstract: A robust and re-usable dipstick-type fluorescent pH sensor for the alkaline pH range was developed by embedding a brightly fluorescent boron-dipyrromethene (BODIPY) dye bearing an acidic phenol moiety into a polyurethane matrix immobilized on a 3D epoxy-functionalized polymer support. The sensor strip has a dynamic working range of pH 10.0-13.1, i.e., operates in strongly basic media where pH glass electrodes can suffer from alkaline errors, and tolerates a high electrolyte background such as simulated seawater and sewage. This work describes the preparation of the sensing material and provides insight into the features that a hydrogel sensing membrane can bestow on an embedded pH-responsive dye by means of optical spectroscopic investigations.
authors.affiliation: Div. 1.9 Sensor Materials, BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, D-12489 Berlin, Germany.
authors.forename: Mandy
authors.initials: M
authors.lastname: Hecht
authors.forename: Werner
authors.initials: W
authors.lastname: Kraus
authors.forename: Knut
authors.initials: K
authors.lastname: Rurack