Applied Physics A

, Volume 120, Issue 3, pp 1059–1068 | Cite as

Electrical conduction mechanism of poly(3,4-ethylenedioxythiophene) nanofiber bundles at low temperature

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Abstract

The nature of charge transport mechanism in poly(3,4-ethylenedioxythiophene) nanofiber bundles has been studied as a function of temperature, magnetic field and AC electric field. High-resolution transmission electron micrographs show the formation of nanofibers with an average diameter of 14 nm. X-ray diffraction analysis depicts the enhancement of polymer chains ordering with increasing dopant concentration. Analysis of the temperature dependence of resistivity reveals a three-dimensional variable range hopping electrical conduction mechanism in the synthesized nanofibers system. A large positive magnetoresistance has been observed at low temperature, which shows a decreasing trend with increasing temperature as well as dopant concentration. The high value of positive magnetoresistance at low temperature has been explained by the wave function shrinkage model. The decrease in frequency exponent s with increasing temperature suggests that the AC conduction takes place through correlated barrier hopping mechanism.

Keywords

Localization Length Sodium Dodecyl Sulfate Concentration Effective Barrier Height Charge Transport Mechanism Positive Magnetoresistance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Authors acknowledge the financial support provided by UGC-DAE-CSR Indore Centre, India, through project Grant No. CSR-I/CRS-50/50. Authors sincerely thank Dr. R. Rawat Scientist UGC-DAE-CSR Indore Centre and Dr. K. Asokan Scientist IUAC for providing the facilities to carry out the DC resistivity, magnetoresistance and AC conductivity measurements and for their scientific discussion during the experiment.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Materials Research Laboratory, Department of PhysicsTezpur UniversityNapaam, TezpurIndia

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