Preparation of iron oxide nanocrystals by surfactant-free or oleic acid-assisted thermal decomposition of a Fe(III) alkoxide
Preparation of iron oxide nanocrystals by surfactant-free or oleic acid-assisted thermal decomposition of a Fe(III) alkoxide
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DOI：
10.1016/j.jmmm.2007.08.018
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发表时间：
2008-03-01
影响因子：
2.7
通讯作者：
Bergstrom, Lennart
中科院分区：
文献类型：
--
作者：
Ahniyaz, Anwar;Seisenbaeva, Gulaim A.;Bergstrom, Lennart
开发了一种基于醇盐的非水解合成氧化铁纳米晶的新路线。2-甲氧基乙氧基铁的前驱体在无表面活性剂的条件下热分解，得到了平均尺寸为5.6 nm的均匀的氧化铁纳米晶。透射电子显微镜研究表明，纳米晶体受到表面排斥层的保护，使其不被聚集，该表面层可能来自于烷氧基-醇盐配体。油酸的加入得到了单分散的纳米晶，平均尺寸为4 nm。穆斯堡尔谱分析证实，纳米晶主要由磁铁矿组成。对磁滞回线测量、零场和场冷却测量的分析表明，磁滞回线的大小与单磁区超顺磁性纳米晶的理论非常吻合，并且磁区的大小与透射电子显微镜所得的微晶尺寸有很好的相关性。(C)2007 Elsevier B.V.保留所有权利。
A new non-hydrolytic, alkoxide-based route was developed to synthesize iron oxide nanocrystals. Surfactant-free thermal decomposition of the iron 2-methoxy-ethoxide precursors results in the formation of uniform iron oxide nanocrystals with an average size of 5.6 nm. Transmission electron microscope study shows that the nanocrystals are protected against aggregation by a repulsive surface layer, probably originating from the alkoxy-alkoxide ligands. Addition of oleic acid resulted in monodisperse nanocrystals with an average size of 4 nm. Mossbauer analysis confirmed that the nanocrystals mainly consisted of maghemite. Analysis of the magnetic hysteresis loop measurements and the zero field and field cooled measurements displayed an excellent fit to established theories for single-domain superparamagnetic nanocrystals and the size of the magnetic domains correlated well to the crystallite size obtained from transmission electron microscope. (C) 2007 Elsevier B.V. All rights reserved.