I would like to synthesize Fe2O4 ferromagnetic nanoparticles around 10-20 nm in size. Can any experts in the same topic suggest to me the method to synthesize the Fe2O4 nanoparticles, if possible suggests some articles.
Thank you
The best method for this is co-precipitation method. You can use FeCl3 and NaOH. This will help you.
Co precipitation is the easy and simple method to synthesis these nanoparticles [ if u doesn't care much on mono dispersed particles] else you have to follow hydro thermal or other advanced methods , By varying the FeCl2 and FeCl3 ratio you can tune the particles from Fe3O4 to y-Fe2O3 with addition of NH4OH or NaOH . Also , if the synthesized particles were less than 25 nm then it may exhibit superparamagnetic property rather than ferromagnetic . The size and shape of the particle can be tuned at different temperature and atmosphere.
I suppose ultrasonic assisted Co-precipitation method under N2 flow and using diluted reagent.
dilute reagents prevent coagulation during precipitation process.
for preventing further oxidation of Fe3O4 nano particle you should use protective atmosphere such as Ar or N2 gas flow.
for collecting small size, nano particle you should use ultrasonic ...
also sonication process, reduces poly-dispersity range of nano particles size distribution ...
If you want narrow size distribution and well dispersion, Thermal Decomposition is by far the best method. Although it render nanoparticles only soluble in non polar solvents , there are several methods to "pulling" them to a water environment if such condition is necessary. There are several thermal decomposition methods and they differ in the type of solvents and precursors. I suggest the following: Chem. Mater., Vol. 19, No. 15, 2007.
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