Abstract
The preparation and characterisation of core–shell magnetic nanostructure with nickel oxide (NiO) core and silica (SiO2) as shell has been reported. Nanoparticles of bare NiO were produced by co-precipitation technique, and silica was coated on NiO using the standard Stober’s protocol. Structural and metal oxide vibrations analysed with X-ray diffractometer (XRD) and Fourier transform infrared spectra (FTIR) confirm the formation of core–shell nanostructures. Spherical morphology of the samples was initially observed in SEM, and core–shell nature was further confirmed by high-resolution transmission electron microscopy (HRTEM) analysis. Ultraviolet (UV)–visible spectroscopic studies reveal a strong interaction between core and shell materials which leads to a significant alteration in the optical absorption. A distinct bluish green emission observed in the photoluminescence (PL) studies confirms the presence of oxygen vacancies. Coating of SiO2 on NiO was found to amend the magnetic behaviour of core–shell system, and this change in magnetic ordering was explained on the basis of typical interfacial effects between the core–shell structures.
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The authors acknowledge the Department of Science and Technology, Government of India for providing financial support for Mrs. S. Sumithra under the Women Scientist Scheme (WOS-A) (ref SR/WOS-A/PM-1006/2014).
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Sumithra, S., Jaya, N.V. Synthesis, Structural, Optical and Magnetic Properties of Pure NiO and NiO@SiO 2 Core–Shell Nanospheres. J Supercond Nov Magn 30, 1129–1136 (2017). https://doi.org/10.1007/s10948-017-4025-5
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DOI: https://doi.org/10.1007/s10948-017-4025-5