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<p>Two-dimensional transition metal dichalcogenides (TMDs) have attracted considerable interest due to their electronic and optical properties. We synthesized WSe₂/copper-doped zinc oxide nanocomposites using a controlled hydrothermal method with varying copper doping concentrations (2% and 5%). Comprehensive characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis) spectroscopy, zeta potential analysis, and Fourier transform infrared (FTIR) spectroscopy revealed the structural, morphological, and optoelectronic properties of the materials. XRD analysis confirmed the hexagonal crystal structure of WSe₂ and showed lattice modifications from copper doping. SEM investigations demonstrated successful integration of copper-doped ZnO nanorods with WSe₂ nanosheets, forming hybrid structures with concentration-dependent morphological variations. UV-visible spectroscopy showed a pronounced blue shift in optical absorption, with band gap energies increasing from 3.59&#xa0;eV for pristine WSe₂ to 4.73&#xa0;eV for 5% doped composites. This significant blue shift was attributed to the Burstein-Moss effect, where increased carrier density from copper doping positions the Fermi level within the conduction band. Zeta potential measurements indicated improved surface stability at optimal doping levels. FTIR spectroscopy confirmed successful chemical incorporation and revealed doping-induced vibrational changes. These findings provide a strategy for tailoring WSe₂/Cu-ZnO nanocomposites for optoelectronics, sensing, and catalysis applications.</p>

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Synergistic optoelectronic enhancement in WSe₂/Copper-Doped ZnO nanocomposites: a hydrothermal approach

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Santosh Chackrabarti,
  • Manika Khanuja

摘要

Two-dimensional transition metal dichalcogenides (TMDs) have attracted considerable interest due to their electronic and optical properties. We synthesized WSe₂/copper-doped zinc oxide nanocomposites using a controlled hydrothermal method with varying copper doping concentrations (2% and 5%). Comprehensive characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis) spectroscopy, zeta potential analysis, and Fourier transform infrared (FTIR) spectroscopy revealed the structural, morphological, and optoelectronic properties of the materials. XRD analysis confirmed the hexagonal crystal structure of WSe₂ and showed lattice modifications from copper doping. SEM investigations demonstrated successful integration of copper-doped ZnO nanorods with WSe₂ nanosheets, forming hybrid structures with concentration-dependent morphological variations. UV-visible spectroscopy showed a pronounced blue shift in optical absorption, with band gap energies increasing from 3.59 eV for pristine WSe₂ to 4.73 eV for 5% doped composites. This significant blue shift was attributed to the Burstein-Moss effect, where increased carrier density from copper doping positions the Fermi level within the conduction band. Zeta potential measurements indicated improved surface stability at optimal doping levels. FTIR spectroscopy confirmed successful chemical incorporation and revealed doping-induced vibrational changes. These findings provide a strategy for tailoring WSe₂/Cu-ZnO nanocomposites for optoelectronics, sensing, and catalysis applications.