纳米氧化铁的制备及形貌分析

以九水硝酸铁（Fe（NO₃）₃·9H₂O）为铁源，无水乙醇和乙二胺为表面活性剂，采用水热法制备了纳米氧化铁（Fe₂O₃纳米棒），通过扫描电子显微镜观察分析了Fe₂O₃纳米棒形貌，研究了（Fe（NO₃）₃·9H₂O）质量分数及反应温度对Fe₂O₃纳米棒颗粒尺寸的影响。结果表明，纳米棒的长度和宽度分别约为500～600 nm和50～60 nm；在160～220 ℃范围内，温度对Fe₂O₃纳米棒形貌的影响不显著；在一定范围内提高铁源质量分数可使纳米棒颗粒尺寸变小。Fe₂O₃纳米棒的形成机理为:铁源在强碱性的溶液中反应生成棕黄色絮状沉淀α-FeOOH，该沉淀在高温高压的环境中，在乙二胺作用下脱水形成Fe₂O₃纳米棒。

Preparation and morphology analysis of nano-sized iron oxide

The nano-sized iron oxide(Fe2O3 nano-rods)was prepared by hydrothermal method with Fe(NO3)3·9H2O as the iron source,using anhydrous ethanol and ethylenediamine as the surfactant.The morphology of the Fe2O3 nano-rods was observed and analyzed by scanning electron microscope,and the effects of the Fe(NO3)3·9H2O mass fraction and the reaction temperature on the particle size of Fe2O3 nano-rods were studied.The results show that,the length and width of the Fe2O3 nano-rods are about 500~600 nm and 50~60 nm,respectively.The effect of temperature on the Fe2O3 nano-rod morphology is not significant at 160~220℃.The increase of iron source mass fraction in a certain range decreases the particle size of Fe2O3 nano-rods.The formation mechanism of the Fe2O3 nano-rods is as follows:the iron source reacts in the strongly alkaline solution to form the brown-yellow flocculent precipitatedα-FeOOH,which is dehydrated to form the Fe2O3 nano-rods under the influence of ethylenediamine in a high temperature and high pressure environment.