Abstract
A graphene quantum dot (GQD)-decorated ZnFe2O4 hybrid nanocomposite [GQD-ZHN] was synthesized using the sol–gel technique. In the X-ray diffraction (XRD) analysis, a cubic spinel structure was identified with the space group Fd-3 m. Fourier-transform infrared (FT-IR) analysis revealed the vibration bands of the samples, while the existence of GQDs in GQD-ZHN was confirmed by the Raman spectra. Field emission scanning electron microscopy (FESEM) provided insights into the microstructural morphological topology of the surface. The dielectric properties of GQD-ZHN were analysed with respect to their dependence on frequency and temperature and explained by Maxwell–Wagner-type polarization. The frequency-dependent ac conductivity (σac) followed Jonscher’s power law and investigated the dynamics of ion hop** in GQD-ZHN. Impedance and modulus spectroscopy were used to further evaluate electrical characteristics such as relaxation time (τ). Nyquist plots have been used to estimate grain and grain boundary contributions. The GQD-ZHN exhibited superparamagnetic properties at room temperature. At room temperature, GQD-ZHN exhibited a strong magneto-dielectric coupling (MD) and showed negative magneto-dielectric properties in low-frequency regions. These properties of GQD-ZHN enable it to be used as a potential application in microelectronic systems, spintronics and memory devices.
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Funding
For the DST Inspire Fellowship, Rutam Biswal acknowledges DST, New Delhi. We appreciate the financial support provided to Centre of Materials Sciences under the FIST Programme by DST (Grant No. SR/FST/PSI-216/2016).
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RB: Synthesis, Writing original draft, Conceptualization, Data curation and Formal analysis. PY: Formal analysis. PK: Characterization and Formal analysis. MKS: Conceptualization, editing, Formal analysis and supervision.
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Biswal, R., Yadav, P., Kumar, P. et al. Synthesis, Structural, Dielectric, Magnetic and Magnetodielectric Properties of Graphene Quantum Dots (GQDs) Decorated ZnFe2O4 Hybrid Nanocomposite (GQD-ZHN). J Inorg Organomet Polym (2024). https://doi.org/10.1007/s10904-023-02976-3
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DOI: https://doi.org/10.1007/s10904-023-02976-3