Pentiptycene-tbutylpyrene based poly(arylene-ethynylene)s: Highly sensitive and selective TNT sensor in aqueous as well as vapor phase
| Autor: | S. K. Sharma, Sangram K. Rath, Tanaji K. Ghorpade, Sarada P. Mishra, P. K. Pujari, Akshaya K. Palai, Kathi Sudarshan, Manoranjan Patri |
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| Rok vydání: | 2017 |
| Předmět: |
Quantum yield
02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences chemistry.chemical_compound Polymer chemistry Materials Chemistry medicine Thermal stability Electrical and Electronic Engineering Instrumentation chemistry.chemical_classification Aqueous solution Chemistry Arylene Metals and Alloys Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Pyrene 0210 nano-technology Vapours |
| Zdroj: | Sensors and Actuators B: Chemical. 252:901-911 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2017.06.059 |
| Popis: | A series of poly(arylene-ethynylene)s (PAEs) containing pentiptycene and tbutylpyrene or pyrene in the main chain were synthesized. Introduction of pyrene moiety in the pentiptycene polymeric backbone made the polymers extremely sensitive and selective towards TNT in aqueous solution as well as vapour phase as compared to the other interfering nitroaromatic compounds (NACs) like DNT and PA. In solid state, one of the polymer P2 showed superior sensitivity towards TNT vapours with 60.4% and 90% fluorescence loss within respective 10 s and 30 s of exposure to TNT vapours, which is much higher than most of the reported NACs sensors. Even towards aqueous NACs, the performance of P2 is the best, with 69.8% fluorescence of P2 film getting quenched within 60 s of immersion in aqueous solution of TNT (50 μM). Fluorescence regain study showed that 94% fluorescence is re-gained after dipping the fluorescence-quenched polymer film in methanol for 20 s. The polymers were found to possess high thermal stability (282–585 °C) and appreciably high fluorescence quantum yield (0.39–0.65). We also report the sub-nanoscopic free volume and its distribution in the polymers, as quantified by positron annihilation life time spectroscopy (PALS). |
| Databáze: | OpenAIRE |
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