Effect of film thickness, blending and undercoating on optical detection of nitroaromatics using fluorescent polymer films |
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Authors: | Zhaohui Wang Jianjun Ma Dongge Ma |
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Affiliation: | a Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, K1S 5B6 Canada b Département d'informatique et d'ingénierie, Université du Québec en Outaouais, Pavillon Lucian-Brault 101, Rue Saint-Jean-Bosco, Gatineau, Québec, J8X 3X7 Canada c State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 China |
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Abstract: | In this work, using a fluorescent poly(phenylene ethynylene) containing the rigid pentiptycene and large cholesteryl ester pendent groups, the fluorescence quenching properties of the polymer thin films in response to vapor of 2,4-dinitrotulene (DNT) have been investigated by varying the film thickness, applying an undercoating and blending with another polar polymer. A significant change in fluorescence intensity (51% in 60 s) in response to DNT vapor exposure at ambient temperature was achieved when the polymer film coated on glass plate was about 2 nm in thickness. In comparison with the film of polymer alone, the film undercoated with (3-aminopropyl)triethoxysilane and the film of polymer blend containing a non-fluorescent polymer showed additional 18.5% (in 20-s exposure) and 18.7% (in 5-min exposure) decrease in fluorescence intensity, respectively. The use of polymer or polymer blend coated on optic-fiber tip for detection of DNT vapor has also been demonstrated. |
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Keywords: | Nitroaromatics detection Fibre-optic sensing Fluorescent polymers |
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