Magnetic and Characterization Studies of CoO/Co3O4 Nanocomposite

Abstract

CoO/Co3O4 nanoparticles (NPs) were synthesized by using a fresh egg white-assisted combustion method which acts as a new approach for green synthesis of this composite. This method was carried out by the direct heat of cobalt precursor with egg white at low temperature for very short period. In fact, this route is a novel, cheap and appropriate technique yielding nanoparticle-based materials. CoO/Co3O4 nanoparticles were characterized by examining the structure and identifying the elements and determining the morphology via XRD, FTIR, SEM, EDS and TEM techniques. The sample magnetic observations were measured through the use of a vibrating sample magnetometer (VSM). The results of XRD, EDS, SEM and TEM confirmed the positive synthesis of the cubic CoO/Co3O4 NPs with sponge crystals which proceed. For the as synthesized composite, 57.75 m2/g, 0.0148 cc/g and 10.31 nm were identified to be the SBET, Vp and ȓ, respectively. The cobalt oxide particles in their nature were polycrystalline, and the crystallite sizes varied from 10 to 20 nm. The magnetic measurement showed that the prepared nanocomposite displays room temperature ferromagnetism with an optimum value, 3.45 emu/g, of saturation magnetization.

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

“…However, it contains high concentrations of both amino acids and proteins, such as albumen and lysozyme [33]. These constituents can act as reducing, capping, and stabilizing agents in the preparation of nanomaterials [34]. In addition, egg white plays a controlling role in the shape of the prepared nano system [35].…”

Fabrication of Cu1.5Mn1.5O4 Nanoparticles Using One Step Self-Assembling Route to Enhance Energy Consumption

“…In addition, the investigated system has superparamagnetism properties depending on its nano particle nature. Moreover, the squareness of the prepared Cu 1.5 Mn 1.5 O 4 NPs was below 0.5, indicating a decrease in anisotropy in the crystal lattice [27]. This behavior could be attributed to magnetostatic interaction between these particles [27].…”

“…Moreover, the squareness of the prepared Cu 1.5 Mn 1.5 O 4 NPs was below 0.5, indicating a decrease in anisotropy in the crystal lattice [27]. This behavior could be attributed to magnetostatic interaction between these particles [27]. Therefore, the prepared Cu 1.5 Mn 1.5 O 4 system can be used in the manufacture of spintronic devices depending upon its room temperature ferromagnetic behavior.…”

“…(i) An extreme broad band detected in the 3650-3100 cm −1 region and a small band of around 1677 cm −1 may due to the stretching and bending vibrations of the adsorbed water molecules of the O-H surface hydroxyl groups [26]. Consequently, these bands validate which high humidity is absorbed by the nanocrystalline system with high surface-to-volume ratio [27]. (ii) The stretching vibration of O=C=O resulted in an IR band observed at 2352 cm −1 [28].…”

Improved Brønsted to Lewis (B/L) Ratio of Co- and Mo-Impregnated ZSM-5 Catalysts for Palm Oil Conversion to Hydrocarbon-Rich Biofuels

“…Concerning the impregnated metals on the ZSM-5 catalyst, more intense investigation on the corresponding characteristic peaks has been conducted. As shown in Figure 1, new peaks appear in the Co/ZSM-5 catalyst at 2θ = 31.3, 36.8, 45, 59.4, and 65.3°, corresponding to the Co3O4 (JCPDS-42-1467) [14][15][16]. It can be observed that the characteristic peaks of Co3O4 at 2θ = 31.3 and 45°, overlap with the characteristic peaks of ZSM-5.…”