Easy synthesis and magnetic properties of iron oxide nanoparticles
Easy synthesis and magnetic properties of iron oxide nanoparticles
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DOI：
10.1021/cm049552x
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发表时间：
2004-07-13
影响因子：
8.6
通讯作者：
Lee, SW
中科院分区：
文献类型：
--
作者：
Woo, K;Hong, J;Lee, SW
采用TEM/HRTEM、XRD和穆斯堡尔谱等方法研究了Fe（CO）（5）在体系剩余氧存在下的热分解和连续通风条件下容易制备的氧化铁纳米颗粒[5-和11-nm磁赤铁矿（γ-Fe 2 O3）和19-nm磁铁矿（Fe 3 O 4）]。利用SQUID磁强计和光学显微镜对纳米粒子的磁性进行了研究。结果表明，中间氧化铁纳米颗粒（曝气前）是由Fe（CO）分解后的氧化和晶体生长的竞争过程形成的（5）。在室温下，充气的5-nm颗粒是超顺磁性的，而19-nm的颗粒是亚铁磁性的，颗粒之间没有相互作用。11-nm的氧化铁纳米粒子是超顺磁性的，粒子之间存在一定的相互作用。
Easy preparation of iron oxide nanoparticles [5- and 11-nm maghemite (gamma-Fe2O3) and 19-nm magnetite (Fe3O4)] by thermal decomposition of Fe(CO)(5) in the presence of residual oxygen of the system and by consecutive aeration were investigated by TEM/HRTEM, XRD, and Mossbauer spectroscopy. Also, the magnetic properties of the nanoparticles were studied by SQUID magnetometer and optical microscopy. It was suggested that the intermediate iron oxide nanoparticles (before aeration) were formed by the competing processes of oxidation and crystal growth after decomposition of Fe(CO)(5). At room temperature, the aerated 5-nm particles were superparamagnetic without interaction among the particles, whereas the 19-nm particles were ferrimagnetic. The 11-nm iron oxide nanoparticles were superparamagnetic with some interactions among the particles.