The preparation of well-dispersed Ni–B amorphous alloy nanoparticles at room temperature

The air-stable well-dispersed Ni–B amorphous alloy nanoparticles in the similar size of 5 nm with narrow deviation were prepared by a chemical solution alloying process at room temperature in a positive microemulsion system. The proposed interface reaction mechanism, element analysis and thermal stability as well as the magnetic behavior of Ni–B amorphous alloy nanoparticles were characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), infrared spectroscopy (IR), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). All the results showed that as synthesized Ni–B amorphous alloy nanoparticles are air-stable in room temperature and coated by macromolecular compound oleic acid. The magnetic property of the as synthesized Ni–B amorphous alloy was discussed based on the obtained results.