A transition in the electrical conduction mechanism of CuO/CuFe2O4 nanocomposites

  • Zeynep Güven ÖzdemirEmail author
  • Mehmet Kılıç
  • Yaşar Karabul
  • Banu Süngü Mısırlıoğlu
  • Öznur Çakır
  • Naime Didem Kahya


The complex impedance, complex permittivity and, alternating current (ac) conductivity investigations of the CuO/CuFe2O4 nanocomposites, prepared by using via co-precipitation and sol-gel methods, were performed between 1 Hz and 40 MHz within 296 K–433 K in the present study. The structural analyses of the samples were determined by scanning electron microscope (SEM), X-ray diffraction (XRD) analysis, energy dispersive X-ray (EDX) spectroscopy and X-Ray Fluorescence (XRF) techniques. The ac impedance and complex permittivity results revealed that these ferrite systems have a heterogeneous structure consisting of conducting grains surrounded with less conducting grain boundaries which are expressed by Koop’s model. Additionally, the temperature dependent dc conductivity showed up the semiconductor-conductor and conductor-semiconductor transitions in different temperatures. From this point of view, the nanocomposites exhibiting conductive or semiconductor behavior depending on temperature have the potential to be used in many electronic devices, including sensor applications. Moreover, the activation energies of the samples calculated by the Arrhenius plots of the dc conductivity indicated both electron and hole hopping processes for the conduction. Furthermore, small polaron charge transport mechanism was implied by the high activation energies. Ac conductivity analyses of the samples showed that the ferrites prepared in the present work exhibit correlated barrier hopping dominantly for the ac conduction.

Graphical Abstract


Copper ferrite Semiconductor-metal-semiconductor transition Nanocomposite Ac conductivity CBH model 



This research was supported by Yildiz Technical University Scientific Research Projects Coordination Department with the Project Number FBA-2017-3162. Authors would also like to thank Prof. Dr. Mehmet Acet for his efforts during the XRD measurements.


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of PhysicsYildiz Technical UniversityIstanbulTurkey
  2. 2.Faculty of Sciences, Department of ChemistryAnkara UniversityAnkaraTurkey

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