title: Conjugated poly(fluorene-quinoxaline) for fluorescence imaging and chemical detection of nerve agents with its paper-based strip.
abstract: Conjugated polymer of poly(fluorene-co-quinoxaline) was synthesized via Suzuki coupling polymerization. The emission color of the polymer can be tuned depending on the concentration of the polymer in solution. A low-energy bandgap is observed both in the concentrated solution and in the solid state, caused by aggregation of the polymer chains, resulting in long wavelength emission from the quinoxaline moiety, while short wavelength emission can be seen in diluted, well-dissolved solution. The presence of quinoxaline units enables us to demonstrate fluorescence switching and imaging. Paper-based strips containing the polymer are prepared via simple immersion of filter paper in the polymer solution for practical use in the detection of nerve agents. The emission of the paper-based strip is quenched upon exposure to diethyl chlorophosphate (DCP), a nerve agent simulant, and the initial emission intensity can be almost restored by treatment with aqueous sodium hydroxide solution, making a possible reversible paper-based sensor.
authors.affiliation: Organic and Optoelectronic Materials Laboratory, Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University , Daejeon 305-764, Korea.
authors.forename: Seonyoung
authors.initials: S
authors.lastname: Jo
authors.forename: Daigeun
authors.initials: D
authors.lastname: Kim
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Son
authors.forename: Yongkyun
authors.initials: Y
authors.lastname: Kim
authors.forename: Taek Seung
authors.initials: TS
authors.lastname: Lee
mesh_terms: D002490:Central Nervous System / Q000187:drug effects*; D005449:Fluorenes / Q000737:chemistry; D005453:Fluorescence; D005740:Gases / Q000302:isolation & purification* / Q000633:toxicity; D006801:Humans; D009943:Organophosphorus Compounds / Q000302:isolation & purification* / Q000633:toxicity; D011108:Polymers / Q000737:chemistry; D011810:Quinoxalines / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D005449:Fluorenes; D005740:Gases; D009943:Organophosphorus Compounds; D011108:Polymers; D011810:Quinoxalines; C548970:diethylchlorophosphate; D014867:Water