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<p>A combination of chemical approach and microwave technique was used to prepare the NiO/rGO nanocomposite by changing the concentration of rGO from 0.2 to 1&#xa0;g and adding 1&#xa0;mM nickel acetate as the precursor for NiO nanoparticles. The structural properties of the NiO/rGO nanocomposite were validated using the X-ray diffraction (XRD) Technique. The presence of various diffraction peaks at 24.6, 37.3, 44.8, 52.2, and 76.8° with the corresponding planes of (002) for rGO, (111) NiO, (200) NiO, (200) Ni, and (311) NiO, respectively, confirms the successful formation of NiO/rGO nanocomposites. The chemical properties of the NiO/rGO nanocomposites were evaluated by using Fourier transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX), and X-ray Photoelectron Spectroscopy (XPS) techniques. Furthermore, the morphological study of the samples was conducted using the Field Emission Scanning Electron Microscopy (FESEM) technique. The presence of a flower-like structure of NiO on the rGO sheet further added to the successful formation of NiO/rGO nanocomposite. The optical band gap (<i>E</i><sub><i>g</i></sub>) of the samples was determined using the Tauc plot derived from the absorption spectra. The <i>E</i><sub><i>g</i></sub> of the composite shifted from 1.84 to 1.7&#xa0;eV as the concentration of rGO was increased from 0.2 to 1&#xa0;g.</p>

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Optical band gap tuning by changing the concentration of reduced graphene oxide in NiO/rGO nanocomposite

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Dhruva Kumar,
  • Joydeep Biswas,
  • Dheeraj Kumar,
  • Rabina Bhujel,
  • Suveksha Tamang

摘要

A combination of chemical approach and microwave technique was used to prepare the NiO/rGO nanocomposite by changing the concentration of rGO from 0.2 to 1 g and adding 1 mM nickel acetate as the precursor for NiO nanoparticles. The structural properties of the NiO/rGO nanocomposite were validated using the X-ray diffraction (XRD) Technique. The presence of various diffraction peaks at 24.6, 37.3, 44.8, 52.2, and 76.8° with the corresponding planes of (002) for rGO, (111) NiO, (200) NiO, (200) Ni, and (311) NiO, respectively, confirms the successful formation of NiO/rGO nanocomposites. The chemical properties of the NiO/rGO nanocomposites were evaluated by using Fourier transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX), and X-ray Photoelectron Spectroscopy (XPS) techniques. Furthermore, the morphological study of the samples was conducted using the Field Emission Scanning Electron Microscopy (FESEM) technique. The presence of a flower-like structure of NiO on the rGO sheet further added to the successful formation of NiO/rGO nanocomposite. The optical band gap (Eg) of the samples was determined using the Tauc plot derived from the absorption spectra. The Eg of the composite shifted from 1.84 to 1.7 eV as the concentration of rGO was increased from 0.2 to 1 g.