Fe_3O_4纳米晶的水热法合成及表征

Hydrothermal Synthesis and Characterization of Fe_3O_4 Nanocrystallite

利用铁粉和水之间水热反应合成Fe3O4纳米晶。XRD、FTIR、TEM和TG—DSC等分析测试结果表明：采用该法，在无任何表面活性剂或模板存在的情况下，在150℃，24h合成了平均厚度为82nm的片状Fe3O4纳米结构；在180℃，10h合成了平均厚度为96nm的片状Fe3O4纳米结构；在180℃，24h合成了直径大小为35～47nm和长度为190～714nm的枝晶状Fe3O4纳米晶。最后，探讨了Fe3O4纳米晶的水热合成机理。

Fe3O4 Nanocrystallite was synthesized by the hydrothermal method using iron powders and water, and was characterized by means of XRD, FTIR, TEM and TG - DSC. The results show that the Fe3O4 obtained at 150℃ for 24h or at 180℃ for 10h consists of nanoplates with an average thickness of about 82 nm or 96 nm, respectively, while that obtained at 180℃ for 24h comprises nanodentries with the diameter in the range of 35 -47 nm and 190 -714 nm in length. The use of any extra surfactant or template during the synthesis was avoided. The possible formation mechanism of Fe3O4 in this hydrothermal system was discussed.