title: Efficient fluorescence "turn-on" sensing of dissolved oxygen by electrochemical switching.
abstract: We report on a novel method for sensing oxygen that is based on the use of a perylene diimide dye (1) which is electrochemically reduced to its nonfluorescent dianion form (1(2-)). In the presence of oxygen, the dianion is oxidized to its initial form via an electron-transfer reaction with oxygen upon which fluorescence is recovered. As a result, the fluorescence intensity of the dianion solution increases upon the addition of oxygen gas. Results demonstrate that high sensitivity is obtained, and the emission intensity shows a linear correlation with oxygen content (0.0-4.0% v/v) at ambient barometric pressure. In addition, using electrochemical reduction, oxygen determination becomes regenerative, and no significant degradation is observed over several turnovers. The limit of detection is 0.4% oxygen in argon gas.
authors.affiliation: Department of Chemistry, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Ik-Soo
authors.initials: IS
authors.lastname: Shin
authors.forename: Thomas
authors.initials: T
authors.lastname: Hirsch
authors.forename: Benno
authors.initials: B
authors.lastname: Ehrl
authors.forename: Dong-Hak
authors.initials: DH
authors.lastname: Jang
authors.forename: Otto S
authors.initials: OS
authors.lastname: Wolfbeis
authors.forename: Jong-In
authors.initials: JI
authors.lastname: Hong
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D004563:Electrochemistry; D005663:Furans / Q000737:chemistry; D010100:Oxygen / Q000032:analysis* / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D005663:Furans; C018674:tetrahydrofuran; D010100:Oxygen