期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 12, 期 3, 页码 877-893出版社
SPRINGER
DOI: 10.1007/s11051-009-9636-8
关键词
Hematite nanoparticles; Nanodiscs; Hydrothermal synthesis
资金
- Australia Research Council (ARC) through the ARC Centre of Excellence for Functional Nanomaterials
- Natural Science Foundation of China [NSF50671019]
- China Postdoctoral Science Foundation [2005038252]
This study reports a facile hydrothermal method for the synthesis of monodispersed hematite (alpha-Fe2O3) nanodiscs under mild conditions. The method has features such as no use of surfactants, no toxic precursors, and no requirements of high-temperature decomposition of iron precursors in non-polar solvents. By this method, alpha-Fe2O3 nanodiscs were achieved with diameter of 50 +/- 10 nm and thickness of similar to 6.5 nm by the hydrolysis of ferric chloride. The particle characteristics (e. g., shape, size, and distribution) and functional properties (e. g., magnetic and catalytic properties) were investigated by various advanced techniques, including TEM, AFM, XRD, BET, and SQUID. Such nanodiscs were proved to show unique magnetic properties, i.e., superparamagnetic property at a low temperature (e. g., 20 K) but ferromagnetic property at a room temperature (similar to 300 K). They also exhibit low-temperature (<623 K) catalytic activity in CO oxidation because of extremely clean surfaces due to non-involvement of surfactants, compared with those spheres and ellipsoids capped by PVP molecules.
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