The binding and fluorescence quenching efficiency of nitroaromatic (explosive) vapors in fluorescent carbazole dendrimer thin films

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dc.contributor.authorShaw, PEen_AU
dc.contributor.authorCavaye, Hen_AU
dc.contributor.authorChen, SSYen_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorGentle, IRen_AU
dc.contributor.authorBurn, PLen_AU
dc.date.accessioned2013-10-08T01:51:32Zen_AU
dc.date.available2013-10-08T01:51:32Zen_AU
dc.date.issued2013-01-01en_AU
dc.date.statistics2013-10-08en_AU
dc.description.abstractWe present a study on three generations of fluorescent carbazole dendrimers that exhibit strong binding with nitroaromatic compounds accompanied by photoluminescence (PL) quenching, making them attractive sensing materials for the detection of explosives such as 2,4,6-trinitrotoluene (TNT). The absorption and release of vapors of the (deuterated) TNT analogue 4-nitrotoluene (pNT) from thin films of the dendrimers were studied with a combination of time-correlated neutron reflectometry and PL spectroscopy. When saturated with pNT the PL of the films was fully quenched and could not be recovered with flowing nitrogen at room temperature but only upon heating to 40-80 [degree]C. Although the majority of the absorbed pNT could be removed with this method the recovered films were found to still contain a residual pNT concentration of [similar]0.1 molecules per cubic nanometer. However, the proportion of the PL recovered increased with generation with the third generation dendrimer exhibiting close to full recovery despite the presence of residual pNT. This result is attributed to a combination of two effects. First, the dendrimer films present a range of binding sites for nitroaromatic molecules with the stronger binding sites surviving the thermal recovery process. Second, there is a large decrease of the exciton diffusion coefficient with dendrimer generation, preventing migration of the excitation to the remaining bound pNT.© 2013, Royal Society of Chemistryen_AU
dc.identifier.citationShaw, P. E., Cavaye, H., Chen, S. S. Y., James, M., Gentle, I. R., & Burn, P. L. (2013). The binding and fluorescence quenching efficiency of nitroaromatic (explosive) vapors in fluorescent carbazole dendrimer thin films. Physical Chemistry Chemical Physics, 15 (24), 9845-9853. doi:10.1039/c3cp51372fen_AU
dc.identifier.govdoc5102en_AU
dc.identifier.issn1463-9076en_AU
dc.identifier.issue24en_AU
dc.identifier.journaltitlePhysical Chemistry Chemical Physicsen_AU
dc.identifier.pagination9845-9853en_AU
dc.identifier.urihttp://dx.doi.org/10.1039/c3cp51372fen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4779en_AU
dc.identifier.volume15en_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectCarbazolesen_AU
dc.subjectThin filmsen_AU
dc.subjectExplosivesen_AU
dc.subjectPhotoluminescenceen_AU
dc.subjectTNTen_AU
dc.subjectThermal recoveryen_AU
dc.titleThe binding and fluorescence quenching efficiency of nitroaromatic (explosive) vapors in fluorescent carbazole dendrimer thin filmsen_AU
dc.typeJournal Articleen_AU
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