Please use this identifier to cite or link to this item:
Title: The binding and fluorescence quenching efficiency of nitroaromatic (explosive) vapors in fluorescent carbazole dendrimer thin films
Authors: Shaw, PE
Cavaye, H
Chen, SSY
James, M
Gentle, IR
Burn, PL
Keywords: Carbazoles
Thin films
Thermal recovery
Issue Date: 1-Jan-2013
Publisher: Royal Society of Chemistry
Citation: Shaw, 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/c3cp51372f
Abstract: We 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 Chemistry
Gov't Doc #: 5102
ISSN: 1463-9076
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.