Design of Zn0.5-xMg0.5NixFe2O4/CeO2/NiFe2O4 nanocomposites with superior energy storage and biocompatibility

초록

This study reports the successful synthesis and comprehensive characterization of Zn0.5-xMg0.5NixFe2O4(x = 0.1-0.3)/CeO2/NiFe(2)O(4)nanocomposites (designated as ZNMCF-1, ZNMCF-2, and ZNMCF-3). X-ray diffraction (XRD) confirmed the coexistence of high-purity cubic spinel ferrite and face-centred cubic fluorite CeO(2)phases, with crystallite sizes ranging from 6 to 11 nm. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) revealed quasi-spherical, densely packed nanoparticles with average grain sizes of 12-16 nm, while energy-dispersive X-ray spectroscopy (EDS) and elemental mapping demonstrated the uniform distribution of all constituent elements. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analyses verified the oxidation states of Ni2+, Mg2+, Zn2+, Ce4+, and Fe(3+)and indicated the presence of short-range magnetic ordering. The nanocomposites exhibited superparamagnetic behavior, with saturation magnetization (Ms) values ranging from 30.68 to 34.61 emu g(-1). Among the synthesized samples, ZNMCF-1 demonstrated the best electrochemical performance, delivering a specific capacity (Cs) of similar to 131.07 C g(-1)at a current density of 1.50 A g(-1), owing to its low internal resistance and enhanced ion diffusion. In addition, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) cell viability assays and fluorescence imaging performed on mouse muscle fibroblast (BLO-11) and human pancreatic carcinoma (PANC-1) cell lines demonstrated excellent biocompatibility, with cell viability exceeding 82% even at a concentration of 1000 mu g mL(-1). These findings indicate that the synthesized nanocomposite series is a promising multifunctional material for high-performance energy storage and safe biomedical applications.

키워드