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Characterization of Electrically Conductive Polymers.

The major problem with characterizing electrically conductive polymer films is that they have high light absorbance, while current characterization methods rely on high transmittance. The main objective of this research was to examine two characterization methods, conductivity testing and reflectance spectroscopy. First, polyaniline was synthesized from a solution of aniline and lithium chloride. Film samples were prepared from the polyaniline using different processing techniques. The processing differed in the type of casting and the doping of the films. Some samples were cast films while others were spin-coated onto silicon wafers. The time for which the samples were doped was varied as well. Once all of the samples were prepared, the conductivity of each film was determined from measurements made using the four-point probe resistance testing method. The reflectance spectra of the samples were tested using a spectrophotometer with a reflectance cell attachment. The maximum refractive and attenuation indices were determined from these spectra by using the Kramers-Kronig transformation. After testing, the data was analyzed to determine how useful the methods could be in characterizing the processing methods used in different electrically conductive polymer films. The results showed that conductivity measurements may be useful, but the equipment used for these experiments was not sensitive enough to detect the slight differences in doping time of the films. The measurements of optical properties of the films did show some promise for helping to characterize films, and further testing is warranted.
Chris Kantus
South Carolina Governor's School for Science and Mathematics
COPYRIGHT 2001 South Carolina Academy of Science
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Copyright 2001 Gale, Cengage Learning. All rights reserved.

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Author:Kantus, Chris
Publication:Bulletin of the South Carolina Academy of Science
Article Type:Brief Article
Geographic Code:1USA
Date:Jan 1, 2001
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