Easy Synthesis and Magnetic Properties of Iron Oxide Nanoparticles
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- 作者：Kyoungja Woo ; Jangwon Hong ; Sungmoon Choi ; Hae-Weon Lee ; Jae-Pyoung Ahn ; Chul Sung Kim ; and Sang Won Lee
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：July 13, 2004
- 年：2004
- 卷：16
- 期：14
- 页码：2814 - 2818
- 全文大小：222K
- 年卷期：v.16,no.14(July 13, 2004)
- ISSN：1520-5002
文摘
Easy preparation of iron oxide nanoparticles [5- and 11-nm maghemite (
-Fe2O3) and 19-nm magnetite (Fe3O4)] by thermal decomposition of Fe(CO)5 in the presence of residual oxygenof the system and by consecutive aeration were investigated by TEM/HRTEM, XRD, andMössbauer spectroscopy. Also, the magnetic properties of the nanoparticles were studied bySQUID magnetometer and optical microscopy. It was suggested that the intermediate ironoxide nanoparticles (before aeration) were formed by the competing processes of oxidationand crystal growth after decomposition of Fe(CO)5. At room temperature, the aerated 5-nmparticles were superparamagnetic without interaction among the particles, whereas the 19-nm particles were ferrimagnetic. The 11-nm iron oxide nanoparticles were superparamagneticwith some interactions among the particles.
-Fe2O3) and 19-nm magnetite (Fe3O4)] by thermal decomposition of Fe(CO)5 in the presence of residual oxygenof the system and by consecutive aeration were investigated by TEM/HRTEM, XRD, andMössbauer spectroscopy. Also, the magnetic properties of the nanoparticles were studied bySQUID magnetometer and optical microscopy. It was suggested that the intermediate ironoxide nanoparticles (before aeration) were formed by the competing processes of oxidationand crystal growth after decomposition of Fe(CO)5. At room temperature, the aerated 5-nmparticles were superparamagnetic without interaction among the particles, whereas the 19-nm particles were ferrimagnetic. The 11-nm iron oxide nanoparticles were superparamagneticwith some interactions among the particles.