Detection of Explosive Vapors: The Roles of Exciton and Molecular Diffusion in Real-Time Sensing

被引:15
作者
Ali, Mohammad A. [1 ]
Shoaee, Safa [1 ]
Fan, Shengqiang [1 ]
Burn, Paul L. [1 ]
Gentle, Ian R. [1 ]
Meredith, Paul [1 ]
Shaw, Paul E. [1 ]
机构
[1] Univ Queensland, Sch Math & Phys, Sch Chem & Mol Biosci, Ctr Organ Photon & Elect, Brisbane, Qld 4072, Australia
基金
澳大利亚研究理事会;
关键词
conjugated polymers; explosives; fluorescence; sensors; time-resolved spectroscopy; POLYMER SENSORS; SOLID-STATE; FLUORESCENT; FILMS; TNT; CHEMOSENSORS; BINDING;
D O I
10.1002/cphc.201600767
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:3350 / 3353
页数:4
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