“…␣-Fe 2 O 3 and Fe 3 O 4 ), are generally recognized as most of promising materials because of their low cost, non-toxicity, environmental benignity, and interesting magnetic behaviors, which is of great importance to have potential applications as catalysts, gas sensors, magnetic filters, electrode materials, magnetic storage media, as well as materials for microwave absorbing and shielding research [13][14][15][16][17]. Interestingly, these intrinsic properties of magnetic nanostructures may be tailored by controlling their shape, composition, size, and so forth.…”