NO2 chemical oxidation doping effect on spin-coated poly(3-octylthiophene) thin films for NO2 sensing applications

J. Ceron Solis; Elder De La Rosa; E. Pena Cabrera

doi:10.1117/12.611673

14 February 2005 NO₂ chemical oxidation doping effect on spin-coated poly(3-octylthiophene) thin films for NO₂ sensing applications

J. Ceron Solis, Elder De La Rosa, E. Pena Cabrera

Author Affiliations +

Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005) https://doi.org/10.1117/12.611673
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico

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.

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J. Ceron Solis, Elder De La Rosa, and E. Pena Cabrera "NO₂ chemical oxidation doping effect on spin-coated poly(3-octylthiophene) thin films for NO₂ sensing applications", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); https://doi.org/10.1117/12.611673

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