Preparation of iron oxide nanocrystals by surfactant-free or oleic acid-assisted thermal decomposition of a Fe(III) alkoxide

被引：34

作者：

Ahniyaz, Anwar ^{[1
]}

Seisenbaeva, Gulaim A. ^{[2
]}

Haggstrom, Lennart ^{[3
]}

Kamali, Saeed ^{[3
]}

Kessler, Vadim G. ^{[2
]}

Nordblad, Per ^{[4
]}

Johansson, Christer ^{[5
]}

Bergstrom, Lennart ^{[1
]}

机构：

[1] Stockholm Univ, Dept Phys Inorgan & Struct Chem, Arrhenius Lab, Mat Chem Res Grp, S-10691 Stockholm, Sweden

[2] Swedish Univ Agr Sci, Dept Chem, S-75007 Uppsala, Sweden

[3] Uppsala Univ, Dept Phys, S-75121 Uppsala, Sweden

[4] Uppsala Univ, Dept Engn Sci, S-75121 Uppsala, Sweden

[5] Imego Inst, S-41133 Gothenburg, Sweden

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 06期

关键词：

ironoxide; nanocrystal; synthesis; alkoxide; superparamagnetic;

D O I：

10.1016/j.jmmm.2007.08.018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：781 / 787

页数：7

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