Journal
THIN SOLID FILMS
Volume 518, Issue 15, Pages 4281-4289Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2009.12.112
Keywords
Iron oxide; Nanoparticle; Poly(vinyl alcohol); Nanorods; Freezing/thawing process; Transmission electron microscopy; Magnetic properties
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Magnetite (Fe3O4) nanostructures with different morphologies including uniform nanoparticles, magnetic beads and nanorods were synthesized via a co-precipitation method. The synthesis process was performed at various temperatures in the presence of polyvinyl alcohol (PVA) at different concentrations. It is shown that small amounts of PVA act as a template in hot water (70 degrees C), leading to the oriented growth of Fe3O4 nanorods, which was confirmed by selected area electron diffraction. Individually coated magnetite nanoparticles and magnetic beads were formed at a relatively lower temperature of 30 degrees C in the folded polymer molecules due to the thermo-physical properties of PVA. When a moderate temperature (i.e. 50 degrees C) was used, nanorods and nanobeads co-existed. At higher concentrations of PVA (polymer/iron mass ratio of 5), however, the formation of magnetic beads was favored. The nanorods were shown to be unstable upon exposure to electron beams. Freezing/thawing process was applied post synthesis as temperature programming to fabricate stable nanorods with rigid walls. (C) 2010 Elsevier By. All rights reserved.
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