Abstract
In the present work, n-type nickel ferrite (NF) particles prepared by sol gel autocombustion method were used to synthesize optimized polyaniline-nickel ferrite (PANI-NF) nanocomposite by in situ polymerization method. Then, NF, PANI and the composite were structurally characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Improved π-electron delocalization in PANI-NF composite as compared to that in PANI was confirmed from FTIR analysis. Interfacial interaction between PANI and NF was confirmed from XRD studies. Highly agglomerated, more densely packed particles of the composite facilitating easier charge transport were confirmed from SEM image. Transmission electron microscopy (TEM) image was analysed to calculate accurate average particle size of the composite by fitting the data to log-normal distribution function. Crystalline nature of the composite was confirmed from selected area electron diffraction (SAED) analysis. Remarkable increase in AC conductivity of the PANI-NF composite as compared to that of PANI due mainly to the formation of interfacial heterojunction barrier between p-type PANI and n-type NF was confirmed experimentally and well supported theoretically by calculating binding energy, hopping distance and density of states at Fermi level as per correlated barrier hopping (CBH) model.
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Acknowledgements
The authors are thankful to University Grants Commission, New Delhi, for their financial support, provided under major research project (41-917/2012 (SR) dated: 23/07/2012) to carry out this work. This paper is a collaborative effort between Government Science College, Chitradurga and Mahatma Gandhi University, Kottayam-686 560, India. The authors also wish to acknowledge SAIF, Cochin, for providing facilities for structural characterization of the samples.
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Megha, R., Ravikiran, Y.T., Vijaya Kumari, S.C. et al. Influence of n-type nickel ferrite in enhancing the AC conductivity of optimized polyaniline-nickel ferrite nanocomposite. Appl. Phys. A 123, 245 (2017). https://doi.org/10.1007/s00339-017-0866-9
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DOI: https://doi.org/10.1007/s00339-017-0866-9