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dc.contributor.advisorGangopadhyay, Shubhraeng
dc.contributor.advisorPolo-Parada, Luiseng
dc.contributor.authorDarr, Charles Matthew, 1984-eng
dc.date.issued2014eng
dc.date.submitted2014 Falleng
dc.description"December 2014."eng
dc.descriptionDissertation Supervisors: Dr. Shubhra Gangopadhyay and Dr. Luis Polo-Parada.eng
dc.descriptionIncludes vita.eng
dc.description.abstractRapid degradation of fluorescent conjugated polymers in ambient conditions imposes severe restrictions on their utility for long-term, portable sensing applications. This dissertation discusses the combined use of low-density, ultra-thin oxide capping layers and plasmonic silver gratings as a means of improving the utility of fluorescent conjugated polymer ultra-thin films (<50 nm) for long-term, portable chem/bio sensing applications. Silver gratings produced by a low-cost micro-contact printing method enhanced emission of poly-[2-methoxy-5-(2-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) by as much as 12-fold with respect to films on flat silver through a mechanism of surface plasmoncoupled emission, which directs specific emitted wavelengths toward the detection window of the fluorescence microscope. Addition of a low-density, ultra-thin silica capping layer (d = 5.07 nm, n = 1.38) improved MEH-PPV photostability significantly with respect to uncapped films under both short-term continuous illumination as well as long-term storage in dark, ambient air, while retaining a rapid quenching response to nitroaromatic vapors. Capped, plasmonic-enhanced MEH-PPV film showed a response to 2,4-dinitrotoluene vapor at a rate more than 7-fold faster than capped films on SiO2-coated silicon, attributed to a combination of sensitization effects of the silver on the conjugated polymer molecules in close proximity to the metal. Lateral diffusion of nitroaromatic vapor into the film is tracked by monitoring growth of quenched regions through fluorescence imaging. Most importantly, the devices recover fluorescence spontaneously on removal from the xvii nitroaromatic vapor source, suggesting they could be used for long-term, real-time measurements of nitroaromatic vapors.eng
dc.description.bibrefIncludes bibliographical references (pages 98-117).eng
dc.format.extent1 online resource (3 files) : illustrations (some color)eng
dc.identifier.merlinb109689884eng
dc.identifier.oclc917609034eng
dc.identifier.urihttps://hdl.handle.net/10355/45737
dc.identifier.urihttps://doi.org/10.32469/10355/45737eng
dc.languageEnglisheng
dc.publisher[University of Missouri--Columbia]eng
dc.relation.ispartofcommunityUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsOpenAccesseng
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
dc.sourceSubmitted by the University of Missouri--Columbia Graduate Schooleng
dc.titlePlasmonic-enhanced fluorescent conjugated polymer chemosensor for ultra-sensitive detection of nitroaromatic vaporseng
dc.typeThesiseng
thesis.degree.disciplineBiological engineering (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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