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Proceedings Paper

NO2 chemical oxidation doping effect on spin-coated poly(3-octylthiophene) thin films for NO2 sensing applications
Author(s): J. Ceron Solis; Elder De La Rosa; E. Pena Cabrera
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Paper Abstract

Chemical oxidation doping effect produced by 3000 ppm of NO2 with N2 balance on spin coated regioregular head-to-tail poly(3-octylthiophene) (P3OT) thin films is reported. Undoped and doped states mechanisms are discussed based on changes in optical absorptiometry, surface analysis and refractive index. The two midgaps created for few minutes in the P3OT under NO2 doping effect by the polarons and bipolarons for mobility capabilities and its final doped state has been optically monitored and discussed. A significant change on the surface of undoped and doped P3OT thin films was inspected by atomic force microscopy (AFM). A P3OT refractive index transition from 1.69 (undoped) to 1.55 (doped) has been observed and discussed. Finally, the electrostatic attraction between the polaron and its counter ion (NO2-) has been analyzed for the possibility to diffuse the counter ion from the P3OT thin films and make possible its backward state (reversibility). The theoretical and experimental data results presented are part of a fiber optic chemical sensor (FOCS) project for NO2 particles detection.

Paper Details

Date Published: 14 February 2005
PDF: 7 pages
Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); doi: 10.1117/12.611673
Show Author Affiliations
J. Ceron Solis, Ctr. de Investigaciones en Optica, A.C. (Mexico)
Elder De La Rosa, Ctr. de Investigaciones en Optica, A.C. (Mexico)
E. Pena Cabrera, Univ. de Guanajuato (Mexico)

Published in SPIE Proceedings Vol. 5776:
Eighth International Symposium on Laser Metrology
R. Rodriguez-Vera; F. Mendoza-Santoyo, Editor(s)

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