Abstract
In this thesis, we focus on synthesis of two magnetic nanoparticles-Ni and Fe3O4. We use high-temperature decomposition method to decompose metal precursor, then by controlling the concentration of precursor, temperature, reaction time, and the concentration of protecting agent to get different size nanoparticles. Then, we use microwave-assisted methods and one-pot method to synthesize Ag@Ni and Ag@Fe3O4. In measure parts, we use transmission electron microscopy (TEM) to characterize size and shape of particles. The composition of the nanoparticles was determined by energy dispersion spectrum (EDS). Magnetization measurements were performed with M-H curves on vibrating sample magnetometer (VSM), and M-T and M-H curves on a Superconducting Quantum Interference Device (SQUID) magnetometer. After all, we discuss the relationship between the shape of particles (shell and single sphere) and their coercivity.