竹节状α-Fe2O3纳米棒的制备、表征和性能研究 |
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引用本文: | 陈传盛,刘咏,黄伯云,雷霆,陈小华.竹节状α-Fe2O3纳米棒的制备、表征和性能研究[J].光谱学与光谱分析,2009,29(10):2871-2874. |
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作者姓名: | 陈传盛 刘咏 黄伯云 雷霆 陈小华 |
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作者单位: | |
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基金项目: | 国家自然科学基金,湖南省自然科学基金,中国博士后科学基金 |
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摘 要: | 以硝酸铁为铁源,氨水为沉淀剂,聚乙二醇(PEG)为分散剂,采用共沉淀法制备氢氧化铁前驱体,然后将获得的前驱体在450℃、氮气保护下热处理2 h,最后利用透射电镜、X射线衍射、拉曼光谱和近边X射线精细结构光谱(NEXAFs)表征样品的形貌和结构,并使用HH-50型振动样品磁强计测量样品在室温下的磁学行为.透射电镜结果显示,获得的样品由氧化铁纳米颗粒和竹节状氧化铁纳米棒组成,纳米颗粒的粒径范围为50~100 nin,纳米棒的直径大约为10 nin.XRD表征显示样品中氧化铁纳米棒和纳米颗粒为赤铁矿型α-Fe2O3;光谱实验结果证实了样品中氧化铁纳米颗粒和纳米棒的结构是α-Fe2O3;磁学性能测试表明获得的样品表现为典型铁磁性材料的磁滞回线,其饱和磁感应强度约为64.65 emu·g-1,矫顽力的大小约为15.13 Oe.
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关 键 词: | 氧化铁 纳米棒 竹节状 X射线精细结构 |
收稿时间: | 2008/3/29 |
Preparation,Characterization and Property of Bamboo-Like α-Fe2O3 Nanobars |
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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 a-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. |
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Keywords: | Iron oxide Nanobar Bamboo-like X-ray absorption fine structure |
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