title: Photoinduced electron transfer based ion sensing within an optical fiber.
abstract: We combine suspended-core microstructured optical fibers with the photoinduced electron transfer (PET) effect to demonstrate a new type of fluorescent optical fiber-dip sensing platform for small volume ion detection. A sensor design based on a simple model PET-fluoroionophore system and small core microstructured optical fiber capable of detecting sodium ions is demonstrated. The performance of the dip sensor operating in a high sodium concentration regime (925 ppm Na(+)) and for lower sodium concentration environments (18.4 ppm Na(+)) is explored and future approaches to improving the sensor's signal stability, sensitivity and selectivity are discussed.
authors.affiliation: Institute for Photonics & Advanced Sensing and School of Chemistry & Physics, The University of Adelaide, North Terrace, SA 5005, Australia. florian.englich@adelaide.edu.au
authors.forename: Florian V
authors.initials: FV
authors.lastname: Englich
authors.forename: Tze Cheung
authors.initials: TC
authors.lastname: Foo
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Richardson
authors.forename: Heike
authors.initials: H
authors.lastname: Ebendorff-Heidepriem
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Sumby
authors.forename: Tanya M
authors.initials: TM
authors.lastname: Monro
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002412:Cations; D004583:Electrons; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods*; D005456:Fluorescent Dyes / Q000737:chemistry; D007476:Ionophores / Q000737:chemistry; D008027:Light; D055100:Optical Fibers; D038761:Photobleaching; D012964:Sodium / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D000097:Acetonitriles; D002412:Cations; D005456:Fluorescent Dyes; D007476:Ionophores; D012964:Sodium; C032159:acetonitrile