Conjugated polymer−titania nanoparticle hybrid films : random lasing action and ultrasensitive detection of explosive vapors

Deng, Changmin, He, Qingguo, He, Chao, Shi, Liqi, Cheng, Jiangong and Lin, Tong 2010, Conjugated polymer−titania nanoparticle hybrid films : random lasing action and ultrasensitive detection of explosive vapors, Journal of physical chemistry B, vol. 114, no. 13, pp. 4725-4730.

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Title Conjugated polymer−titania nanoparticle hybrid films : random lasing action and ultrasensitive detection of explosive vapors
Author(s) Deng, Changmin
He, Qingguo
He, Chao
Shi, Liqi
Cheng, Jiangong
Lin, Tong
Journal name Journal of physical chemistry B
Volume number 114
Issue number 13
Start page 4725
End page 4730
Total pages 6
Publisher American chemical society
Place of publication Washington, D.C.
Publication date 2010-04-08
ISSN 1520-6106
1520-5207
Summary 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 - 1012/cm3) 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.

Language eng
Field of Research 091202 Composite and Hybrid Materials
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30035305

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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