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<p>This study reports the synthesis of ternary graphene oxide-functionalized (ZnO)<sub>1−x</sub>(NiO)<sub>x</sub> nanocomposite using a facile hydrothermal technique. Cubic NiO and hexagonal wurtzite ZnO structural phases were gotten, while the percentage compositions were verified using theoretical Rietveld analysis. Field emission scanning electron microscopy (FESEM) showed the morphologies, while EDX studies confirmed the varying compositions. UV–Vis spectroscopy revealed varied bandgaps between 1.9&#xa0;eV and 3.4&#xa0;eV, while the Raman studies showed characteristic D and G peaks centered at ∼&#xa0;1100 and ∼&#xa0;1600&#xa0;cm<sup>−1</sup> belonging to the constituent elemental modes. PL spectroscopy confirmed the presence of GO and the composite oxides. Using selected CO, H<sub>2</sub>S, LPG, NH<sub>3</sub>, and Cl<sub>2</sub> gases, varying performances with high sensitivity were obtained. The photocatalytic degradation after 90&#xa0;min gave 88.5%, 90.4%, and 94.3% for the GOZnO<sub>0.8</sub>NiO<sub>0.2</sub>, GOZnO<sub>0.5</sub>NiO<sub>0.5</sub>, and GOZnO<sub>0.2</sub>NiO<sub>0.8</sub> composites, respectively.</p> Graphical abstract <p>Hydrothermal synthesis and characterizations of functionalized (ZnO)<sub>X</sub>/(NiO)<sub>1−X</sub> composites</p>

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Photocatalytic degradation and gas-sensing properties of hydrothermally synthesized (ZnO)X/(NiO)1−X incorporated with a functionalized graphene oxide

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Femi D. Matthew,
  • Onyekachi M. Nwakanma,
  • Agnes C. Nkele,
  • Adil Alshoaibi,
  • Solomon U. Offiah,
  • Perpetua K. Alor,
  • Gotan H. Jain,
  • Sarika D. Shinde,
  • B. A. Ezekoye,
  • A. B. C. Ekwealor,
  • Ganesh E. Patil,
  • Fabian I. Ezema

摘要

This study reports the synthesis of ternary graphene oxide-functionalized (ZnO)1−x(NiO)x nanocomposite using a facile hydrothermal technique. Cubic NiO and hexagonal wurtzite ZnO structural phases were gotten, while the percentage compositions were verified using theoretical Rietveld analysis. Field emission scanning electron microscopy (FESEM) showed the morphologies, while EDX studies confirmed the varying compositions. UV–Vis spectroscopy revealed varied bandgaps between 1.9 eV and 3.4 eV, while the Raman studies showed characteristic D and G peaks centered at ∼ 1100 and ∼ 1600 cm−1 belonging to the constituent elemental modes. PL spectroscopy confirmed the presence of GO and the composite oxides. Using selected CO, H2S, LPG, NH3, and Cl2 gases, varying performances with high sensitivity were obtained. The photocatalytic degradation after 90 min gave 88.5%, 90.4%, and 94.3% for the GOZnO0.8NiO0.2, GOZnO0.5NiO0.5, and GOZnO0.2NiO0.8 composites, respectively.

Graphical abstract

Hydrothermal synthesis and characterizations of functionalized (ZnO)X/(NiO)1−X composites