[Preparation, characterization and property of bamboo-like alpha-Fe2 O3 nanobars]

Firstly, hydroxide iron precursor was prepared by the co-precipitation method through using nitric iron as the source of iron, ammonia as precipitants, and poly-glycol as dispersant. Secondly, the precursor was calcined at 450 degrees C for 2 h under the protection of nitrogen. Finally, the images and structures of resultant powders were investigated by transmission electron microscopes (TEM), X-ray diffraction (XRD), Raman spectrum and the near-edge X-ray absorption fine structure (NEXAFS), respectively, and the magnetic property of resultant powders was measured by a vibrating sample magnetometer (VSM HH-50). The experimental results of TEM show that the products are composed of Fe2 O3 nano-particles with sizes in the range of 50-100 nm and bamboo-like Fe2 O3 nanobars about 10 nm in diameter. The experimental results of XRD and spectrum illuminate that the structures of products are alpha-Fe2 O3. Moreover, magnetic properties measurement reveals that the products exhibit typical magnetic hysteresis loops of ferromagnetism materials, and their saturation magnetization and coercive force are approximately 64.65 emu x g(-1) and 15.13 Oe, respectively.