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Absorption edge and the refractive index dispersion of carbon-nickel composite films at different annealing temperatures

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Abstract.

In this paper, the optical properties of carbon-nickel films annealed at different temperatures 300, 500, 800 and 1000 ° C, with a special emphasis on the absorption edge, were investigated. The optical transmittance spectra in the wavelength range 300-1000nm were used to compute the absorption coefficient. The optical dispersion parameters were calculated according to Wemple and DiDomenico (WDD) single-oscillator model. Photoluminescence (PL) measurements of carbon-nickel films exhibit two main peaks at about 2.5 and 3.3eV which correspond to the fundamental indirect and direct gap, respectively. The field emission scanning electron microscopy (FESEM) showed that the absorption edge in the films was controlled by the nanoparticle size. The films annealed at 500 ° C have minimum indirect optical band gap and maximum disorder.

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Authors and Affiliations

  1. Department of Physics, Malayer University, Malayer, Iran

    Vali Dalouji

  2. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Seyed Mohammad Elahi

  3. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Shahram Solaymani & Atefeh Ghaderi

Authors
  1. Vali Dalouji
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  2. Seyed Mohammad Elahi
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  3. Shahram Solaymani
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  4. Atefeh Ghaderi
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Correspondence to Vali Dalouji.

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Dalouji, V., Elahi, S., Solaymani, S. et al. Absorption edge and the refractive index dispersion of carbon-nickel composite films at different annealing temperatures. Eur. Phys. J. Plus 131, 84 (2016). https://doi.org/10.1140/epjp/i2016-16084-8

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  • DOI: https://doi.org/10.1140/epjp/i2016-16084-8

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