期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 114, 期 13, 页码 4725-4730出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp9117198
关键词
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资金
- Ministry of Science and Technology of China [2007AA06A407, 2009BAK64B00-03, 2009BAK43B15]
- National Natural Science Foundation of China [60977067, 50973128]
- CAS
- Shanghai Science and Technology Committee [09XD1405000, 08JC1421900]
We have first demonstrated that a random laser action generated by a hybrid film composed of a semiconducting organic polymer (SOP) and TiO2 nanoparticles can be used to detect 2,4,6-trinitrotoluene (TNT) vapors. The hybrid film was fabricated by spin-casting SOP solution dispersed with nanosized TiO2 particles on quartz glass. The SOP in the hybrid film functioned as both the gain medium and the sensory transducer. A random lasing action was observed with a certain pump power when the size (diameter of 50 nm) and concentration (8.9 x 10(12)/cm(3)) of TiO2 nanoparticles were optimized. Measurements of fluorescence quenching behavior of the hybrid film in TNT vapor atmosphere (10 ppb) showed that attenuated lasing in optically pumped hybrid film displayed a sensitivity to vapors of explosives more than 20 times higher than was observed from spontaneous emission. This phenomenon has been explained with the four-level laser model. Since the sensory transducer used in the hybrid polymer/nanoparticles system could be replaced by other functional materials, the concept developed could be extended to more general domains of chemical or environment detection.
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