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23 September 2011 Polyaniline nanofilms as a base for novel optical sensor structures
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Abstract
Polyaniline hydrochloride was prepared by the oxidation of aniline hydrochloride with ammonium peroxodisulfate in dilute hydrochloric acid. The polyaniline films were produced during the polymerization on the microscope glass surfaces immersed in the reaction mixture. The thin film was created and its thickness has been about 100 nm. We have measured the spectral transmittance together with temperature changes. The polyaniline thin film is conductive and we observed changes in optical transmittance spectra and reflective spectra with electric current. Optical spectra have been measured in range from 380 nm to 1010 nm. The electric conductivity has been changed with silicate substrate. This substrate influenced the free electrons distribution and therefore the optical properties of polyaniline. Due to electric current going through the nanofilm its sensitivity to temperature has been increased. We also observed two specific spectral windows. The first one was characterized by its insensitivity to temperature; the second one has been temperature sensitive. The central wavelength of insensitive window is about 500nm. This property can be the base for novel sensors structures. We used Ocean Optics USB spectrometer for evaluation of spectral changes. Wideband white light halogen source from the same manufacturer has been applied as a light source. Small polarizing dependence of reflected light has been observed too.
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Vladimir Vasinek, Jiri Bocheza, Stanislav Hejduk, Jan Latal, Petr Koudelka, and Jan Vitasek "Polyaniline nanofilms as a base for novel optical sensor structures", Proc. SPIE 8102, Nanoengineering: Fabrication, Properties, Optics, and Devices VIII, 81020H (23 September 2011); https://doi.org/10.1117/12.893085
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