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<p>The synthesized reduced graphene oxide (rGO)/nickel oxide (NiO) nanocomposites were systematically investigated to understand the structural, morphological, optical and electronic properties. The structural properties were studied by X-ray diffraction which confirmed the formation of rGO/NiO nanocomposites with the cubic nature of NiO. Raman spectroscopy was employed to investigate the effect of increasing rGO content on the I<sub>D</sub>/I<sub>G</sub> ratios and to study the additional structural defects. UV–Vis and diffuse reflectance spectroscopy show a slight narrowing of the band gap of the composites due to π–d orbital coupling at the rGO-NiO interface. FESEM images show well-dispersed NiO nanoparticles on wrinkled rGO sheets, while EDX and elemental mapping confirmed the uniform spatial distribution of Ni, O and C elements. FTIR spectra exhibited characteristic Ni<b>─</b>O vibrational modes accompanied by a decrease in oxygenated carbon functionalities. XPS confirmed the presence of Ni<sup>2+</sup> species and demonstrated electronic interactions between NiO and rGO. Photoluminescence (PL) analysis was used to investigate the near-band-edge and defect-level emissions associated with interstitial defects and oxygen vacancies present in the composites.</p>

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Study of structural, electrical and optical properties of rGO/NiO nanocomposites

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Saurabh Pandey,
  • Subhash Chandra,
  • Samten Bhutia,
  • Rakesh Malik,
  • S. Annapoorni,
  • R. C. Ramola

摘要

The synthesized reduced graphene oxide (rGO)/nickel oxide (NiO) nanocomposites were systematically investigated to understand the structural, morphological, optical and electronic properties. The structural properties were studied by X-ray diffraction which confirmed the formation of rGO/NiO nanocomposites with the cubic nature of NiO. Raman spectroscopy was employed to investigate the effect of increasing rGO content on the ID/IG ratios and to study the additional structural defects. UV–Vis and diffuse reflectance spectroscopy show a slight narrowing of the band gap of the composites due to π–d orbital coupling at the rGO-NiO interface. FESEM images show well-dispersed NiO nanoparticles on wrinkled rGO sheets, while EDX and elemental mapping confirmed the uniform spatial distribution of Ni, O and C elements. FTIR spectra exhibited characteristic Ni─O vibrational modes accompanied by a decrease in oxygenated carbon functionalities. XPS confirmed the presence of Ni2+ species and demonstrated electronic interactions between NiO and rGO. Photoluminescence (PL) analysis was used to investigate the near-band-edge and defect-level emissions associated with interstitial defects and oxygen vacancies present in the composites.