Preparation and magnetic properties of nano size nickel ferrite particles using hydrothermal method

Chemistry Central Journal

Kamellia Nejati¹  Rezvanh Zabihi¹ 

[1] Department of Chemistry, Payame Noor University, PO Box 19395-3697, Tehran, Iran

关键词: Nanostructures;    Surfactants;    Magnetic properties;    Oxides;   

Others  :  788369
DOI  :  10.1186/1752-153X-6-23

 received in 2011-12-17, accepted in 2012-03-30,  发布年份 2012

【 摘 要 】

Background

Nickel ferrite, a kind of soft magnetic materials is one of the most attracting class of materials due to its interesting and important properties and has many technical applications, such as in catalysis, sensors and so on. In this paper the synthesis of NiFe₂O₄ nanoparticles by the hydrothermal method is reported and the inhibition of surfactant (Glycerol or Sodium dodecyl sulfate) on the particles growth is investigated.

Methods

For investigation of the inhibition effect of surfactant on NiFe₂O₄ particles growth, the samples were prepared in presence of Glycerol and Sodium dodecyl sulfate. The X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM) and inductively coupled plasma atomic emission spectrometer (ICP-AES) techniques were used to characterize the samples.

Results

The results of XRD and ICP-AES show that the products were pure NiFe₂O₄ and also nanoparticles grow with increasing the temperature, while surfactant prevents the particle growth under the same condition. The average particle size was determined from the Scherrer's equation and TEM micrographs and found to be in the range of 50-60 nm that decreased up to 10-15 nm in presence of surfactant. The FT-IR results show two absorption bands near to 603 and 490 cm^-1 for the tetrahedral and octahedral sites respectively. Furthermore, the saturated magnetization and coercivity of NiFe₂O₄ nanoparticles were in the range of 39.60 emu/g and 15.67 Q_e that decreased for samples prepared in presence of surfactant. As well as, the nanoparticles exhibited a superparamagnetic behavior at room temperature.

Conclusions

Nanosized nickel ferrite particles were synthesized with and without surfactant assisted hydrothermal methods. The results show that with increasing of temperature, the crystallinity of nanoparticles is increased. In the presence of surfactants, the crystallinity of NiFe₂O₄ nanoparticles decreased in comparison with surfactant- free prepared samples. All of the nickel ferrite nanoparticles were superparamagnetic at room temperature.

Graphical abstract

【 授权许可】

   
2012 Nejati et al

【 图 表 】

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