Preparation, Characterization and Property of Bamboo-Like α-Fe2O3 Nanobars
CHEN Chuan-sheng1, 2, LIU Yong1, HUANG Bai-yun1, LEI Ting1, CHEN Xiao-hua2
1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China 2. College of Physics and Eelectronics Science, Changsha University of Science and Technology, Changsha 410076, China
Abstract：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 ℃ 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 Fe2O3 nano-particles with sizes in the range of 50-100 nm and bamboo-like Fe2O3 nanobars about 10 nm in diameter. The experimental results of XRD and spectrum illuminate that the structures of products are α-Fe2O3. 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·g-1 and 15.13 Oe, respectively.
Key words：Iron oxide;Nanobar;Bamboo-like;X-ray absorption fine structure
[1] Iijima S. Nature, 1991, 354: 56. [2] CHENG Hui-ming(成会明). Carbon Nanotubes Synthesis, Microstructure, Properties and Applications(纳米碳管制备、结构、物性及应用). Beijing：Chemical and Industry Press(北京: 化学工业出版社), 2002. [3] Chen C S, Chen X H, Xu L S, et al. Carbon, 2005, 43(8): 1660. [4] Hou P X, Yang Q H, Bai S. J. Phys. Chem. B, 2002, 106(5): 963. [5] Chen C S, Chen X H, Yi B, et al. Acta Materialia, 2006, 54: 5401. [6] Ma R Z, Liang J, Xu C L. J. Power Sources, 1999, 84: 126. [7] Liu X M, Fu S Y, Xiao H M, et al. J. Solid State Chem., 2005, 178(9): 2798. [8] Ngo A T, Pileni M P. J. Appl. Phys., 2002, 92: 4649. [9] Ni Y H, Ge X W, Zhang Z C. Chem. Mater., 2002, 14: 14. [10] Fu Y, Wang R, Xu J, et al. Chem. Phys. Lett., 2003, 379: 373. [11] Lian S, Wang E, Kang Z, et al. Solid State Commun., 2004, 129(8): 485. [12] Zhu L P, Xiao H M, Liu X M, et al. J. Material. Chem., 2006, 16(19): 1794. [13] Li L L, Chu Y, Liu Y. Nanotechnology, 2007, 18: 105603. [14] Saric A, Music S, Nomura K, et al. Mater. Sci. Engineering (B), 1998, 56: 43. [15] Cornell R M, Schwertmann U. The Iron Oxides: Structure, Properties, Reactions, Occurrence and Uses. New York: VCH Publishers, 1996. 395. [16] Fariad L A, Venancio S S, Oliveira M T. J. Raman Spectrosc., 1997, 28: 873. [17] Zawadzki M, Wrzyszcz J. Materials Research Bulletin, 2000, 35: 109. [18] Wu Z Y, Gota S, Jollet F, et al. Phys. Rev. B, 1997, 55: 2570. [19] Groot F M F, Grioni M, Fuggle J C, et al. Phys. Rev. B, 1989, 40: 5715. [20] Guiot E, Wu Z Y, Gota S. J. Electron Spec. and Related Phenomena, 1999, 101-103: 371.
