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Issue 22, 2012
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Electric field-assisted levitation-jet aerosol synthesis of Ni/NiO nanoparticles

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Ni/NiO powdered nanoparticles with average sizes 10–30 nm were prepared by a levitation-jet method involving the condensation of Ni metal vapour in a mixture of helium with various amounts of air or oxygen. The process was undertaken with the application of a DC electric field up to 6.5 kV cm−1. The particles were characterized by X-Ray diffraction, transmission electron microscopy, BET adsorption and vibrating sample magnetometry. It was found that the intensity of the applied electric field and partial oxygen pressure correlated with the main structural and magnetic parameters of the nanoparticles, such as average particle size, residual ratio of nickel, coercivity and maximum magnetisation. The specific surface area of the particles correlated with the magnitude of the external electric field. Room-temperature hysteresis loops of weakly oxidized nanoparticles show ferromagnetic-like behaviour, whereas the strongly oxidized ones exhibit a low-field ferromagnetic feature superimposed to a paramagnetic signal, regardless of the particle size. Magnetic measurements allowed for the estimation of the residual metal Ni content in the powdered nanoparticles, which can be as low as 0.04 at.% depending on oxygen partial pressure and external electric field strength.

Graphical abstract: Electric field-assisted levitation-jet aerosol synthesis of Ni/NiO nanoparticles

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Publication details

The article was received on 28 Feb 2012, accepted on 28 Mar 2012 and first published on 29 Mar 2012

Article type: Paper
DOI: 10.1039/C2JM31233F
Citation: J. Mater. Chem., 2012,22, 11214-11223
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    Electric field-assisted levitation-jet aerosol synthesis of Ni/NiO nanoparticles

    Yu. G. Morozov, O. V. Belousova, M. V. Kuznetsov, D. Ortega and I. P. Parkin, J. Mater. Chem., 2012, 22, 11214
    DOI: 10.1039/C2JM31233F

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