Influence of particle size on Magnetic behavior of nickel oxide nanoparticles

The influence of the particle size on magnetic behaviors of nickeloxide nanoparticles (NiO NPs) was reported. NiO NPs with a uniform particlesize were synthesized via a facile sol-gel method, and various sizes of NiO NPs(11, to 49 nm) were achieved by calcination at various temperatures (400, to 700°C). X-ray diffraction (XRD) analysis revealed that increasing the calcinationtemperature increased the crystallite size. TEM observations and XRD analysiswere used to determine the particle size of the NiO NPs. The field emissionscanning electron microscopy (FESEM) and transmission electron microscopy(TEM) images showed flake-like morphologies, which consisted ofinterconnected nanoparticles with a porous channel. The magnetic properties ofNiO NPs with different size were studied using vibrating sample magnetometer(VSM). The results suggested that the particle size plays an important role inmagnetic property of NiO nanoparticles.