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Preparation and characterization of metalorganic chemical vapor deposited nickel oxide and lithium nickel oxide thin films

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Abstract

Thin films of nickel oxide and lithium nickel oxide were deposited through the pyrolysis of nickel acetylacetonate and lithium nickel acetylacetonate, respectively in the temperature range 350–420 °C. The single solid source precursors, nickel acetylacetonate and lithium nickel acetylacetonate were prepared and characterized using Energy Dispersive X-Ray Fluorescence (EDXRF), X-Ray Diffraction (XRD) and infrared spectroscopy. The composition, optical and electrical properties of the prepared thin films were analysed using a variety of techniques, including, Rutherford Backscattering Spectroscopy (RBS), EDXRF, XRD, UV–Visible Spectrophotometry and van der Pauw conductivity method. The amount of metals in the prepared thin films did not reflect the ratio of the metals in the precursor but was found to depend on the deposition temperature. The energy gaps of the nickel oxide and lithium nickel oxide thin films are 3.7 and 3.2 eV, respectively. The electrical conductivity showed that lithium nickel oxide thin film has an activation energy of 0.11 eV. The conduction was explained by a hopping mechanism.

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Acknowledgement

The RBS was carried out at the D. R. Chick Accelerator Laboratory, University of Surrey, so we thank the staff of the laboratory. We are grateful to the Third World Academy of Science (TWAS, Grant (93-058 R6/PHYS/AF/AC) Italy and Obafemi Awolowo University, Ile-Ife (University Research Committee (URC) for supporting this project. EDXRF was done by Femi Ogunsola of Pollution Laboratory, Obafemi Awolowo University, Ile-Ife. XRD was carried out at EMDI Laboratories, Akure, Nigeria, so we are grateful to all staff of the Institute.

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Authors and Affiliations

  1. Department of Physics, Obafemi Awolowo University, Ile-Ife, Nigeria

    M. A. Eleruja, O. A. Abulude, O. O. Akinwunmi & E. O. B. Ajayi

  2. Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria

    G. O. Egharevba

  3. University of Surrey, Ion Beam Centre, Guildford, Surrey, GU2 7XH, UK

    C. Jeynes

Authors
  1. M. A. Eleruja
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  2. G. O. Egharevba
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  3. O. A. Abulude
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  4. O. O. Akinwunmi
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  5. C. Jeynes
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  6. E. O. B. Ajayi
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Corresponding author

Correspondence to E. O. B. Ajayi.

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Eleruja, M.A., Egharevba, G.O., Abulude, O.A. et al. Preparation and characterization of metalorganic chemical vapor deposited nickel oxide and lithium nickel oxide thin films. J Mater Sci 42, 2758–2765 (2007). https://doi.org/10.1007/s10853-006-1405-9

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  • DOI: https://doi.org/10.1007/s10853-006-1405-9

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