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Journal of Materials Science

, Volume 46, Issue 13, pp 4646–4653 | Cite as

Dielectric relaxation behavior of CdS nanoparticles and nanowires

  • Anoop Chandran
  • M. Soosen Samuel
  • Jiji Koshy
  • K. C. George
Article

Abstract

The dielectric relaxation and scaling behavior of CdS nanoparticles and nanowires were investigated in the frequency range 102–106 Hz and in the temperature range 373–573 K by complex impedance spectroscopy and electric modulus spectroscopy. Studies on the complex permittivity revealed that the dielectric relaxation in CdS nanostructures deviates from Debye like behavior. A detailed study on the grain and grain boundary charge transport was carried out. The charge carrier transport in CdS nanostructures was identified to be hopping of polarons. From the combined analysis of the variation of imaginary part of electric modulus and complex impedance with frequency, it was found that at high temperatures localized conduction is dominant in CdS nanoparticles where as the long range hopping process is dominant with nanowires. It was also found that the scaling behavior of CdS nanoparticles varied considerably from that reported earlier.

Keywords

Dielectric Permittivity Dielectric Relaxation Cadmium Sulfide Boundary Resistance Electric Modulus 

Notes

Acknowledgements

The authors wish to thank Kerala State Council for Science Technology and Environment (KSCSTE) (No. (T) 012/SRS/2008/CSTE) for the financial support. The first author would like to thank STIC (Cochin) and the Common Instrumentation Facility, SB College for the analyses carried out.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Anoop Chandran
    • 1
  • M. Soosen Samuel
    • 1
  • Jiji Koshy
    • 1
  • K. C. George
    • 1
  1. 1.Department of PhysicsS. B. CollegeChanganasseryIndia

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