چکیده (انگلیسی):

Nickel oxide nanoparticles have been synthesized
in the presence of agarose polysaccharide by sol–gel
method. The structure, morphology, optical and magnetic
properties of the product was examined by X-ray diffraction,
transmission electron microscopy, UV–visible spectrophotometer
and superconducting quantum interference
device magnetometer. The result of thermogravimetric
analysis of the precursor product showed that the proper
calcination temperature was 400 C. X-ray diffraction
result revealed that the obtained product was nickel oxide
with face-centered cubic structure. TEM image demonstrated
that the nickel oxide nanoparticles have spherical
shape with size around 3 nm. Analysis of FTIR spectra
confirmed the composition of product. The optical absorption
band gap of the NiO nanoparticles was estimated to be
3.51 eV. Magnetic measurement showed that the nickel
oxide nanoparticles exhibit superparamagnetic behavior at
300 K. Moreover, the nanoparticles show ferromagnetic
interactions at 4.2 K owing to the existence of uncompensated
moments on the surface of the nanoparticles.