Abstract
Polythiophene (PT) was chemically synthesized, undoped using aqueous ammonia and then re-doped using FeCl3 as well as iodine. Doping concentration was changed by changing the duration of doping process. FTIR results indicate the complex formation between PT and each of the dopants. Elemental analysis of FeCl3 doped samples show that as the duration increases concentration of Fe+ ions increases. In case of iodine doped samples atom equivalent of iodine per thiophene unit increases with doping duration. XRD analysis has been used to calculate crystallinity. It is observed that for FeCl3 and iodine (except 120 min) doped samples there is increase in crystallinity due to doping and crystallinity increases with increase in dopant concentration. TGA analysis shows that FeCl3 doped samples are thermally stable compared to iodine doped samples. Results of DTA as well as DSC indicate that Tg values vary with dopant as well as with dopant concentrations. Reduction in Tg values for all FeCl3 doped samples indicate that FeCl3 acts as plasticizer in PT. In iodine doped samples for low values of dopant concentrations Tg increases indicating anti-plasticizer effect whereas for high concentration of iodine, there is decrease in Tg value indicating plasticizer effect of iodine in PT.
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References
J Roncali Chem. Rev. 92 711 (1992)
V Saxena,B D Malhotra Handbook of polymers in electronics (B D Malhotra Ed) (New York: Raptra Technology Ltd.) Chaps. 1, 12, 13, pp 3, 37–411 (1998)
I N Kareiyama Handbook of conductive molecules and polymers (H S Nalwa Ed) (New York: Wiley) Vol. 2, p 271 (1997)
A A Tager The physical chemistry of polymers (D Sobolev Transl) (Moscow: Mir Publishers) Chap 17, p 461–484 (1972)
T Yamamoto, K Sanechika, A Yamamoto J. Polym. Sci. Polym Lett. Ed. 18 9 (1984)
D S Kelkar and A B Chourasia J. Chem. Chem. Tech. 5 3 (2011)
G Tourillion Handbook of conducting polymers (T Skotheim Ed) (New York: Dekker) Chap 9, Sect. 3, p 297 (1986)
G Zotti and G Schiavon J. Electroanal. Chem. 163 385 (1984)
K Nakamoto Infrared spectra of inorganic and coordination compounds (New York: Wiley) Chap. 2, Sect. 2.8, p 109 (1969)
B R Manjunath, A Venkataraman and T Stephen J. Appl. Polym. Sci. 17 1091 (1973)
J P Sharma and S S Sekhon Indian J. Phys. 79 761 (2005)
A K Nath, M Deka and A Kumar Indian J. Phys. 84 1307 (2010)
M Deka, A K Nath and A Kumar Indian J. Phys. 84 1299 (2010)
N Misra, H S Panda, G Kapusetti, S Jaiswal and S Bhattacharya Indian J. Phys. 85 271 (2011)
V A Kargin, P V Kozlov, R M Asimova and L I Ananyeva Dokl. Akad. Nauk USSR 135 357 (1960)
H Kim and P J Harget J. Appl. Phys. 50 6072 (1979)
M J Mehta and R D Andrews Polym. Prep. 14 1260 (1963)
W J Jackson, Jr. and J R Caldwell J. Appl. Polym. Sci. 11 211 (1967)
P Ghersa Modern Plast. 36 135 (1958)
Acknowledgments
The authors were thankful to Prof. V.N. Suryawanshi, Principal, H.P.T. Arts and R.Y.K. Science College, Nasik and Dr. R.S. Varkhede, Head, Department of Chemistry, H.P.T. Arts and R.Y.K. Science College, Nasik for allowing synthesizing the samples in their chemistry research laboratory. The authors were also thankful to Dr. V.D. Bobade and Mr. P.C. Mhaske, Department of Chemistry, H.P.T. Arts and R.Y.K. Science College, Nasik, for valuable discussion and suggestions. Author A.B. Chourasia especially thanked U.G.C., New Delhi for awarding him teacher fellowship (FIP), under XIth plan.
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Kelkar, D.S., Chourasia, A.B. Effect of dopant on thermal properties of polythiophene. Indian J Phys 86, 101–107 (2012). https://doi.org/10.1007/s12648-012-0009-2
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DOI: https://doi.org/10.1007/s12648-012-0009-2