Evaluation of bifunctional applications of CuFe2O4 nanoparticles synthesized by a sonochemical method

Formation, Structure and Magnetic Properties of MFe2O4@SiO2 (M = Co, Mn, Zn, Ni, Cu) Nanocomposites

“…After annealing at 1200 °C, the vibration of Mn–O, Ni–O and Cu–O bands shifted towards higher wavenumbers. The bands at 440–488 cm −1 are attributable to the octahedral stretching vibration of Fe–O bond [ 8 , 19 ]. This slight shift towards low wavenumbers with the increase of annealing temperature suggests changes in crystallite size and M–O bond length in ferrite as a consequence of changes in the spinel structure [ 23 ].…”

“…Dissimilarly, in the cases of MFO, ZFO and CuFO, beside the main MnFe 2 O 4 , ZnFe 2 O 4 and CuFe 2 O 4 phases, a secondary phase was remarked, as follows: Fe 2 O 3 (JCPDS card no. 87-1164 [ 32 ]), ZnO (JCPDS card no 89-1397 [ 32 ]) and a prominent monoclinic CuO phase (JCPDS card no 89-5895) [ 8 , 32 ]. The presence of CuO could be a consequence of the larger complexation constant of Fe 3+ compared to that of Cu 2+ , leading to more stable Fe 3+ complexes than the corresponding Cu 2+ complexes [ 8 ].…”

“…Additionally, the Si-O-Si bond length variations under the influence of the neighboring atom could produce the peak wavenumber shift [2,31]. The band at 1643-1699 cm −1 corresponding to the stretching mode vibration of surface-adsorbed H-O-H molecules disappeared in the case of CFO and MFO annealed at 900 and 1200 [8,19]. This slight shift towards low wavenumbers with the increase of annealing temperature suggests changes in crystallite size and M-O bond length in ferrite as a consequence of changes in the spinel structure [23].…”

“…These properties make them suitable for applications such as sodium-ion batteries, microwave absorbers, magnetic liquids, magnetic refrigeration, magnetic storage, dye removal, enhancement of water oxidation processes, magnetic recording, photocatalysis, ferrofluid technology, medical diagnostics, etc. [ 8 , 17 , 18 , 19 , 20 ]. Depending on the size and shape of particles, NFO exhibits paramagnetic or ferromagnetic behavior, while CuFO exhibits ferromagnetic behavior [ 18 ].…”

“…The MFe 2 O 4 @SiO 2 (M = Co, Cu, Mn, Ni, Zn) spinel ferrites possess a cubic structure with tightly packed arrangement of oxygen atoms and metal ions occupying tetrahedral (A) or octahedral (B) sites [1]. Due to their distinctive structure and magnetic, optical, and electrical properties, the transitional divalent metal ferrites are promising functional materials for many applications [1][2][3][4][5][6][7][8][9][10]. Among different coating materials, SiO 2 is a notable surface modifier due to its exceptional stability, easy conjugation capacity with numerous functional groups, selective and specific coupling ability with biotargets, non-toxicity, and biocompatibility [11].…”