Abstract
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.
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One of the authors M. Alagiri is thankful to the SRM University for providing research fellowship.
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Alagiri, M., Ponnusamy, S. & Muthamizhchelvan, C. Synthesis and characterization of NiO nanoparticles by sol–gel method. J Mater Sci: Mater Electron 23, 728–732 (2012). https://doi.org/10.1007/s10854-011-0479-6
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DOI: https://doi.org/10.1007/s10854-011-0479-6