Structural, Thermal and Electrical Properties of Doped Poly(3,4 ethylenedioxythiophene)

Deepali Kelkar1 and Ashish Chourasia1, 2
Affiliation: 
1 Department of Physics, Institute of Science, Civil Lines, Nagpur – 440 001, India 2 Electronic Science Department, H.P.T.Arts &R.Y.K.Science College, Nasik, India abchourasiansk@rediffmail.com
DOI: 
https://doi.org/10.23939/chcht10.04.395
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Abstract: 
Poly(3,4-ethylenedioxythiophene) (PEDOT) was chemically synthesized, undoped and then re-doped using FeCl3 as well as camphorsulfonic acid (CSA). FT-IR results confirm the nature of the synthesized and doped samples. XRD analysis indicates crystal structure modification after doping and was also used to calculate crystallinity of samples. Crystallinity increases after FeCl3 doping, whereas it reduces due to CSA doping. TGA-DTA results show reduction in Tg value for FeCl3 doped sample while it increases for CSA doped samples compared to that of undoped PEDOT. Reduction in Tg indicates plasticizing effect of FeCl3 whereas increase in Tg show anti-plasticizing effect of CSA in PEDOT. Conductivity value () increases by two orders of magnitude after doping. Log vs. 1/T graph show metallic nature of undoped PEDOT above 308 K, however both doped samples show semiconducting nature from 301 to 383 K.
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