Solid-state dendrimer sensors: probing the diffusion of an explosive analogue using neutron reflectometry

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dc.contributor.authorCavaye, Hen_AU
dc.contributor.authorSmith, ARGen_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorNelson, Aen_AU
dc.contributor.authorBurn, PLen_AU
dc.contributor.authorGentle, IRen_AU
dc.contributor.authorLo, SCen_AU
dc.contributor.authorMeredith, Pen_AU
dc.date.accessioned2009-11-08T23:01:41Zen_AU
dc.date.accessioned2010-04-30T05:05:03Zen_AU
dc.date.available2009-11-08T23:01:41Zen_AU
dc.date.available2010-04-30T05:05:03Zen_AU
dc.date.issued2009-11-03en_AU
dc.date.statistics2009-11-03en_AU
dc.description.abstractDetermining how analytes are sequestered into thin films is important for solid-state sensors that detect the presence of the analyte by oxidative luminescence quenching. We show that thin (230 ± 30 Å) and thick (750 ± 50 Å) films of a first-generation dendrimer comprised of 2-ethylhexyloxy surface groups, biphenyl-based dendrons, and a 9,9,9′,9′-tetra-n-propyl-2,2′-bifluorene core, can rapidly and reversibly detect p-nitrotoluene by oxidative luminescence quenching. For both the thin and thick films the photoluminescence (PL) is quenched by p-nitrotoluene by 90% in 4 s, which is much faster than that reported for luminescent polymer films. Combined PL and neutron reflectometry measurements on pristine and analyte-saturated films gave important insight into the analyte adsorption process. It was found that during the adsorption process the films swelled, being on average 4% thicker for both the thin and thick dendrimer films. At the same time the PL was completely quenched. On removal of the analyte the films returned to their original thickness and scattering length density, and the PL was restored, showing that the sensing process was fully reversible. © 2009, American Chemical Societyen_AU
dc.identifier.citationCavaye, H., Smith, A. R. G., James, M., Nelson, A., Burn, P. L., & Gentle, I. R., Lo, S. C., Meredith, P. (2009). Solid-state dendrimer sensors: probing the diffusion of an explosive analogue using neutron reflectometry. Langmuir, 25(21), 12800-12805. doi:10.1021/la9017689en_AU
dc.identifier.govdoc1329en_AU
dc.identifier.issn0743-7463en_AU
dc.identifier.issue21en_AU
dc.identifier.journaltitleLangmuiren_AU
dc.identifier.pagination12800-12805en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/la9017689en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2229en_AU
dc.identifier.volume25en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectDiffusionen_AU
dc.subjectNeutron reflectorsen_AU
dc.subjectThin filmsen_AU
dc.subjectSolid state physicsen_AU
dc.subjectQuenchingen_AU
dc.subjectPhotoluminescenceen_AU
dc.titleSolid-state dendrimer sensors: probing the diffusion of an explosive analogue using neutron reflectometryen_AU
dc.typeJournal Articleen_AU
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