title: Potassium-selective optical microsensors based on surface modified polystyrene microspheres.
abstract: Ion-selective microspheres based on surface modification of polystyrene particles (0.8 and 2.4 μm, diameter) are presented here for the first time. The traditional lipophilic sensing components of K(+) selective optodes (chromoionophore, ion-exchanger and ionophore) are adsorbed on the surface of the polystyrene particles using a simple mixed solvent method. The resulting microparticles respond to K(+) in an exhaustive sensing mode with excellent selectivity and rapid response time (t95% = 5 s).
authors.affiliation: University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva 4, Switzerland. xiaojiang.xie@unige.ch eric.backker@unige.ch.
authors.forename: Xiaojiang
authors.initials: X
authors.lastname: Xie
authors.forename: Gastón A
authors.initials: GA
authors.lastname: Crespo
authors.forename: Jingying
authors.initials: J
authors.lastname: Zhai
authors.forename: István
authors.initials: I
authors.lastname: Szilágyi
authors.forename: Eric
authors.initials: E
authors.lastname: Bakker