Preparation and properties of nickel ferrite (NiFe2O4) nanoparticles via sol–gel auto-combustion method

Using nickel and ferric nitrates and citric acid, NiFe2O4 nanoparticles are prepared by a simple and cost-effective polyvinylpyrrolidone (PVP) assisted sol–gel auto-combustion method. The synthesised nanoparticles consist of single phase inverse spinel structure of NiFe2O4. The particles are in spherical shape with an average size of ∼8 nm. The vibrational properties show tetrahedral and octahedral sites of NiFe2O4 nanoparticles. The super-paramagnetism is observed with magnetic saturation (Ms) of 50.4 emug−1.

Graphical abstractThe synthesis of nickel ferrite nanoparticles through sol–gel auto-combustion method which is a unique combination of the ignition and the chemical gelatine processes. This method has the advantages of simple preparation, cost-effective and gentle chemistry route resulting in ultra fine and homogeneous powder. The ability to obtain single-phase nickel ferrite magnetic nanoparticles with controllable particle size and size distribution improves its adequacy in a wide range of technological applications.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► NiFe2O4 nanoparticles have been synthesised by a simple and cost-effective polyvinylpyrrolidone (PVP) assisted sol–gel auto-combustion method. ► The particles were in spherical shape with average size of ∼8 nm. ► The superparamagnetic properties were observed.