Journal
CHEMPHYSCHEM
Volume 17, Issue 21, Pages 3350-3353Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201600767
Keywords
conjugated polymers; explosives; fluorescence; sensors; time-resolved spectroscopy
Funding
- Endeavour International Postgraduate Scholarship
- University of Queensland Centennial Scholarship
- Australian Research Council (ARC) [DE120101721]
- ARC [DP130102422, DP120101372]
- Bragg Institute
- Australian Nuclear Science and Technology Organisation (ANSTO)
- Australian Institute for Nuclear Science and Engineering (AINSE)
- Australian Research Council [DE120101721] Funding Source: Australian Research Council
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Time-resolved quartz crystal microbalance with in situ fluorescence measurements are used to monitor the sorption of the nitroaromatic (explosive) vapor, 2,4-dinitrotoluene (DNT) into a porous pentiptycene-containing poly(phenyleneethynylene) sensing film. Correlation of the nitroaromatic mass uptake with fluorescence quenching shows that the analyte diffusion follows the Case-II transport model, a film-swelling-limited process, in which a sharp diffusional front propagates at a constant velocity through the film. At a low vapor pressure of DNT of approximate to 16 ppb, the analyte concentration in the front is sufficiently high to give an average fluorophore-analyte separation of approximate to 1.5 nm. Hence, a long exciton diffusion length is not required for real-time sensing in the solid state. Rather the diffusion behavior of the analyte and the strength of the binding interaction between the analyte and the polymer play first-order roles in the fluorescence quenching process.
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