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<p>Hybrid metal–organic framework (MOF)–oxide architectures offer an effective approach to tuning dielectric and charge-transport properties through interfacial design. In this work, Ni-MOF, CeO<sub>2</sub>, and Ni-MOF@CeO<sub>2</sub> nanocomposites were synthesized via a controlled hydrothermal route and systematically investigated to establish structure–property correlations. X-ray diffraction confirms the formation of phase-pure crystalline components, while FESEM analysis reveals a transformation from compact CeO<sub>2</sub> particles and lamellar Ni-MOF sheets into a well-interconnected hybrid architecture, indicating effective interfacial contact. HRTEM analysis further reveals lattice fringes (~ 0.210&#xa0;nm) corresponding to the (111) plane of crystalline CeO<sub>2</sub>. Electrochemical impedance spectroscopy shows a notable reduction in impedance for the composite (~ 2 Ω), suggesting improved electrical conductivity and enhanced charge-transport behavior. Dielectric measurements demonstrated a high permittivity at low frequencies, followed by a stable response at higher frequencies with reduced loss (tan δ). The AC conductivity reached the order of ~ 10⁻<sup>5</sup> S cm⁻<sup>1</sup>, and the activation energy decreased to ~ 0.013&#xa0;eV at 1&#xa0;MHz, suggesting facilitated charge carrier mobility. Additionally, the composite exhibits a low but measurable saturation magnetization (Ms ≈ 0.04&#xa0;emu/g), indicating weak magnetic responsiveness; however, its practical magnetic separability requires further investigation. Overall, the improved functional behavior is attributed to heterojunction effects and defect-related polarization mechanisms. These findings suggest that Ni-MOF@CeO<sub>2</sub> is a promising candidate for high-frequency dielectric and energy-storage applications.</p>

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Ni-MOF@CeO2 heterostructures: interfacial engineering and dielectric–magnetic response for advanced functional materials

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • M. Sudhakar,
  • K. Ganesh Kumar,
  • G. Sathiyabama,
  • Zhen Fang,
  • Sandhanasamy Devanesan,
  • Mohammad Ahmad Wadaan,
  • K. V. Thilagar

摘要

Hybrid metal–organic framework (MOF)–oxide architectures offer an effective approach to tuning dielectric and charge-transport properties through interfacial design. In this work, Ni-MOF, CeO2, and Ni-MOF@CeO2 nanocomposites were synthesized via a controlled hydrothermal route and systematically investigated to establish structure–property correlations. X-ray diffraction confirms the formation of phase-pure crystalline components, while FESEM analysis reveals a transformation from compact CeO2 particles and lamellar Ni-MOF sheets into a well-interconnected hybrid architecture, indicating effective interfacial contact. HRTEM analysis further reveals lattice fringes (~ 0.210 nm) corresponding to the (111) plane of crystalline CeO2. Electrochemical impedance spectroscopy shows a notable reduction in impedance for the composite (~ 2 Ω), suggesting improved electrical conductivity and enhanced charge-transport behavior. Dielectric measurements demonstrated a high permittivity at low frequencies, followed by a stable response at higher frequencies with reduced loss (tan δ). The AC conductivity reached the order of ~ 10⁻5 S cm⁻1, and the activation energy decreased to ~ 0.013 eV at 1 MHz, suggesting facilitated charge carrier mobility. Additionally, the composite exhibits a low but measurable saturation magnetization (Ms ≈ 0.04 emu/g), indicating weak magnetic responsiveness; however, its practical magnetic separability requires further investigation. Overall, the improved functional behavior is attributed to heterojunction effects and defect-related polarization mechanisms. These findings suggest that Ni-MOF@CeO2 is a promising candidate for high-frequency dielectric and energy-storage applications.