Structural evaluation and nonlinear optical properties of Ni/NiO, Ni/NiCo2O4 and Co/Co3O4 nanocomposites

•Pure and mixed nickel–cobalt nanocomposites were synthesized by chemical method.•The XRD pattern confirms that the nickel–cobalt nanocomposites formed has a spinel structure.•The magnetic hysteresis (M–H) curves of the nanocomposites show excellent ferromagnetic (FM) nature at room temperature.•Ope...

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Bibliographic Details
Published in:Applied surface science 2013-10, Vol.282, p.656-661
Main Authors: Rahulan, K. Mani, Padmanathan, N., Philip, Reji, Balamurugan, S., Kanakam, Charles C.
Format: Article
Language:English
Subjects:
Chemical technique
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Constraining
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Ferromagnetic
Ferromagnetism
Fittings
Nanocomposites
Nanostructure
Nickel
Nonlinearity
Optical limiting
Physics
Reduction (chemical)
Reverse saturable absorption
X-rays
Z-scan
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Summary:•Pure and mixed nickel–cobalt nanocomposites were synthesized by chemical method.•The XRD pattern confirms that the nickel–cobalt nanocomposites formed has a spinel structure.•The magnetic hysteresis (M–H) curves of the nanocomposites show excellent ferromagnetic (FM) nature at room temperature.•Open aperture Z-scan studies demonstrated strong effective two photon absorption to be responsible for the nonlinear absorption.•It is seen that optical limiting is higher for Co3O4 and Ni/NiCo2O4 with larger volume ratio of Co3O4 content. Nanocomposites of Ni/NiO, Ni/NiCo2O4 and Co/Co3O4 have been synthesized by a chemical reduction technique. X-ray diffraction (XRD) and transmission electron microscopy (TEM) images confirm the mixed composite nature of the sample and uniform particle size of approximately 13nm. Formation of Ni/NiCo3O4 solid solution or NiCo2O4 spinel phase in the mixed composite is confirmed by energy dispersive X-ray (EDX) spectrum. Magnetic hysteresis (M–H) curves of the nanocomposites show excellent ferromagnetic (FM) nature at room temperature. Nonlinear optical transmission of the nanocomposites is measured using the open aperture Z-scan technique employing 7 nanosecond laser pulses at 532nm. Experimental results show that NiO/NiO–Co3O4/Co3O4 nanocomposites exhibit good optical limiting performance. From the measurements and numerical fitting of the data to theory, it is found that nonlinear absorption has contributions from excited state absorption and two-photon absorption. Optical limiting is enhanced in Co3O4 and Ni/NiCo2O4 in which the Co3O4 content has a larger volume ratio.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2013.06.028