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<p>This work presents a systematic study of the structural and optical properties of palladium-modified diamond-like carbon (DLC &lt; Pd&gt; ) films synthesized by magnetron sputtering. The focus is placed on the influence of ion-plasma discharge power and Pd concentration on the refractive index, optical bandgap, and dielectric function of the films. It is shown that increasing the discharge power and Pd content enhances sp² clustering within the amorphous carbon matrix, resulting in a significant restructuring of the material’s optical response. The optical bandgap decreases from 1.78 to 0.61&#xa0;eV, accompanied by a reduction in refractive index and increased optical absorption in the visible and near-infrared spectral regions. Analysis of the spectral dependence of the imaginary part of the dielectric function reveals enhanced π-π* optical transitions associated with sp<sup>2</sup> domains and an increased density of localized electronic states in the band tails. A direct correlation is established between Raman spectroscopy parameters (G-peak position and dispersion) and the spectral behavior of optical constants, linking changes in the electronic structure to the observed optical effects. These results demonstrate the potential for precise tuning of the optical characteristics of DLC &lt; Pd&gt; nanocomposite films across a broad spectral range, highlighting their prospects as functional materials for photonics, optoelectronics, and sensing applications.</p>

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Structure-controlled optical response of palladium nanoparticle modified diamond-like carbon films

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • A. R. Assembayeva,
  • А. P. Ryaguzov,
  • F. Bekmurat,
  • M.F. Kadir,
  • R. R. Nemkayeva,
  • A. B. Koshanova

摘要

This work presents a systematic study of the structural and optical properties of palladium-modified diamond-like carbon (DLC < Pd> ) films synthesized by magnetron sputtering. The focus is placed on the influence of ion-plasma discharge power and Pd concentration on the refractive index, optical bandgap, and dielectric function of the films. It is shown that increasing the discharge power and Pd content enhances sp² clustering within the amorphous carbon matrix, resulting in a significant restructuring of the material’s optical response. The optical bandgap decreases from 1.78 to 0.61 eV, accompanied by a reduction in refractive index and increased optical absorption in the visible and near-infrared spectral regions. Analysis of the spectral dependence of the imaginary part of the dielectric function reveals enhanced π-π* optical transitions associated with sp2 domains and an increased density of localized electronic states in the band tails. A direct correlation is established between Raman spectroscopy parameters (G-peak position and dispersion) and the spectral behavior of optical constants, linking changes in the electronic structure to the observed optical effects. These results demonstrate the potential for precise tuning of the optical characteristics of DLC < Pd> nanocomposite films across a broad spectral range, highlighting their prospects as functional materials for photonics, optoelectronics, and sensing applications.