Abstract
In this work we present a controllable synthesis of hollow nanostructures of α-Fe2O3 by a facile hydrothermal route using FeCl3·6H2O as the iron source and NH4H2PO4 as the shape-directing agent. We found that the morphology of α-Fe2O3 experienced a continuous change from thin nanospindles to flat nanodisks via finely tuning the phosphate ion concentration due to the selective absorption of phosphate ions onto the Fe2O3 nanostructures. At a given phosphate ion concentration, prolonging the reaction time led to the formation of hollow nanostructures (nanotubes, nanobeads, and nanorings) due to the dissolution and re-crystallization of Fe2O3. We also found that morphology-preserved conversion from α-Fe2O3 to magnetic Fe3O4/C can be achieved during the CVD reactions in C2H2. The Fe3O4/C nanocomposites with uniformly coated carbon layers exhibited morphology-dependent magnetic properties.
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