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Synthesis, characterization and ellipsometric study of ultrasonically sprayed Co3O4 films

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Abstract

In the present study, cobalt oxide (Co3O4) films were produced using ultrasonic spray pyrolysis technique onto the glass substrate at different temperatures (200–250–300–350 °C). The effect of substrate temperature on the structural, optical, surface and electrical properties of Co3O4 films was reported. Thickness, refractive index and extinction coefficient of the films were determined by spectroscopic ellipsometry, and X-ray diffraction analyses revealed that Co3O4 films were polycrystalline fcc structure and the substrate temperature significantly improved the crystal structure of Co3O4 films. The films deposited at 350 °C substrate temperature showed the best structural quality. Transmittance, absorbance and reflectance spectra were taken by means of UV–Vis spectrophotometer, and optical band gap values were calculated using optical method. Surface images and roughness values of the films were taken by atomic force microscopy to see the effect of deposition temperature on surface properties. The resistivity of the films slightly decreases with increase in the substrate temperature from 1.08 × 104 to 1.46 × 102 Ω cm. Finally, ultrasonic spray pyrolysis technique allowed production of Co3O4 films, which are alternative metal oxide film for technological applications, at low substrate temperature.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Çankırı Karatekin University, Çankırı, Turkey

    O. Gençyılmaz

  2. Department of Physics, Faculty of Science, Anadolu University, Eskişehir, Turkey

    T. Taşköprü

  3. Department of Physics, Faculty of Science, Eskişehir Osmangazi University, Eskişehir, Turkey

    F. Atay & İ. Akyüz

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Gençyılmaz, O., Taşköprü, T., Atay, F. et al. Synthesis, characterization and ellipsometric study of ultrasonically sprayed Co3O4 films. Appl. Phys. A 121, 245–254 (2015). https://doi.org/10.1007/s00339-015-9417-4

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