Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Abstract

In the current study, we developed a simple and biocompatible method for producing core-shell nanoparticles (NPs). Citrate auto combustion and green procedures were used to create core-shell Ag/CoGd0.025Er0.05Fe1.925O4 (Ag/CGEFO) sample with an average crystallite size of 26.84 nm. The prepared samples were characterized via different structural techniques, such as X-ray diffraction (XRD), Raman Spectroscopy (RS), High Resolution Transmission Electron Microscopy (HRTEM), and Energy Dispersive X-ray analysis (EDX). These analyses were utilized to characterize and confirm the successful formation of the core-shell architecture. For core–shell NPs, all peaks of Ag and CoGd0.025Er0.05Fe1.925O4 ferrite are detected in the XRD, confirming the co-presence of the ferrite spinel phase and the cubic Ag phase. The magnetic hysteresis curves demonstrate typical hard ferri-magnetic behavior along with maximum magnetic saturation values up to 53.74 emu g−1 for the CGEFO sample, while an enhanced coercivity is detected for the coated sample. Moreover, the width of the hysteresis loop is increased for the Ag/CGEFO sample compared to the uncoated one. This indicates that the addition of Ag as a shell increases magneto crystalline anisotropy (MCA). Moreover, the Eg of uncoated CGEFO is equal to 1.4 eV, increasing to 3.6 eV for coated ones. This implies the influence of CGEFO is diminished when the surface is coated with Ag (shell), and the reflectance of the Ag/CGEFO core-shell is nearly dependent on the reflectance of the Ag shell layer. Consequently, the Ag/CGEFO can be used as a light shielding substance.

Reduced A–B super exchange interaction in zirconium doped cobalt ferrite due to laser irradiation

“…In figures 3(a), (c), and (e) the non-irradiated samples display spherical clusters with varying volumes and highly aggregated particles [43]. Following Nd:YAG LR, the clusters are fragmented into uneven smaller nano clusters with distinct boundaries, as seen in figures 3(b), (d) and (f) [44]. The figure indicates that the NPs are somewhat aggregated due to magnetic particle interaction.…”