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    • Keywords


      Cobalt oxide; thin films; solar selective coatings; solar thermal applications; electroplating.

    • Abstract


      This communication presents the optical characterization of Co$_3$O$_4$ films electroplated on Cu- and Ni-coated Cu substrates. Co$_3$O$_4$ films were successfully deposited by using the electrochemical deposition method with cobalt acetate tetrahydrate as a cobalt precursor followed by annealing at 350$^{\circ}$C. The as-prepared films were characterized using X-raydiffraction, UV–visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy and stagnation temperature test.The characterization shows the presence of only the cubic spinal Co$_3$O$_4$ phase in all films. The morphological analysis revealed the generation of unique fish-shaped Co$_3$O$_4$ particles with uniform size distribution for the films obtained on the Ni-coated Cu substrate. The Cu substrate with and without nickel plating used for deposition has shown a profound effect on the optical characteristics of films. The solar absorbance as high as 0.96 and thermal emittance as low as 0.02 were obtained for the films deposited on the Ni-coated Cu substrate. The highest value of the figure of merit ($F_1$) of $\sim$0.34 and extrapolated stagnation temperature of $\sim$362$^{\circ}$C were realized for films having better optical characteristics. The results obtained indicate very good potential of the deposited films for solar thermal applications.

    • Author Affiliations



      1. Department of Physics, School of Energy Studies, Savitribai Phule Pune University, Pune 411 007, India
      2. Department of Physics, C. T. Bora College, Pune 412 210, India
    • Dates

  • Bulletin of Materials Science | News

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