Variations of Optical and Structural Properties of C o x O y Thin Films with Thermal Treatment

  • Ekwealor A
  • Offiah S
  • Ezugwu S
  • et al.
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Abstract

The effects of thermal treatment on the optical and structural properties of cobalt oxide C o x O y thin films synthesized in the pores of PVP by chemical bath deposition technique were investigated. Films deposited were crystalline. The optical properties of the films were got from absorbance, transmittance reflectance, refractive index, absorption coefficient, and extinction coefficient measurements. The synthesized C o x O y films turned out to be cobalt oxyhydroxide , CoO(OH), nanocrystals. The crystals obtained were of size 41.84 nm; however, as annealing temperature increased, the size decreased to 16.28 nm. The absorption coefficient, refractive index, and extinction coefficient were found to increase with increase in annealing temperature though not sequentially. For the same energy ranges of the incident photons, the absorption coefficient and refractive index ranged from 0.2 to 1.8 and from 1.4 to 2.3, respectively. The energy band-gap of the films ranged from 1.96 eV to 2.22 eV.

Figures

  • Figure 1: Absorbance spectra for Co π‘₯ O 𝑦 thin films with varying annealing temperatures.
  • Figure 2: Transmittance spectra for Co π‘₯ Oy thin films with varying annealing temperatures.
  • Figure 3: Reflectance spectra for Co π‘₯ O 𝑦 thin films with varying annealing temperatures.
  • Figure 5: Absorption coefficient spectra for Co π‘₯ O 𝑦 thin films with varying annealing temperatures.
  • Figure 4: Band-gap spectra for Co π‘₯ O 𝑦 thin films with varying annealing temperatures.
  • Figure 6: Refractive index spectra forCo π‘₯ O 𝑦 thin filmswith varying annealing temperatures.
  • Figure 7: Extinction coefficient spectra for Co π‘₯ O 𝑦 thin films with varying annealing temperatures.
  • Figure 9: XRDdiffractogram for CoO(OH) films annealed at 473K.

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CITATION STYLE

APA

Ekwealor, A. B. C., Offiah, S. U., Ezugwu, S. C., & Ezema, F. I. (2014). Variations of Optical and Structural Properties of  C  o  x    O  y    Thin Films with Thermal Treatment. Indian Journal of Materials Science, 2014, 1–5. https://doi.org/10.1155/2014/367950

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