Hollow Magnetic Ferrites MFe2O4 (M = Fe, Mn, Co, Zn) Fabrication and Comparison by Using Double Ammonium Salts Orientation
Hollow MFe2O4(M = Fe, Mn, Co, Zn) particles were synthesized via facile solvothermal route employing ammonium bicarbonate (NH4HCO3 and ammonium acetate (NH4Ac) as structureorientated reagents. Among the targeted ferrites, hollow Fe3O4 particles (MFe2O4, M = Fe) were formed by adding NH4HCO3 and NH4Ac, or by only one of them. However, the ferrite MFe2O4(M = Mn, Co, Zn) samples as-prepared with NH4HCO3 and NH4Ac presented two different morpholo- gies which distinguished from the hollow Fe3O4 particles under the same condition. Meanwhile, the monodisperse hollow MFe2O4 (M = Mn, Co, Zn) particles were obtained with NH4Ac, but that similar particles couldn't be obtained with NH4HCO3 only. The results prove that the NH4HCO3 is vital to the formation of hollow MFe2O4 (M = Mn, Co, Zn) particles, and both the concentration of NH4HCO3 and NH4Ac highly determined the composition and structure evolution (whether it is hollow or solid) of magnetic ferrites MFe2O4 (M = Fe, Mn, Co, Zn) particles. Also, a possible mechanism of ferrite hollow spheres formation and evolution is proposed and discussed. Such a reaction system of double ammonium salts orientation provides useful references for nanoscale hollow fabrication.
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Document Type: Short Communication
Publication date: June 1, 2012
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- Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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