期刊
ACS NANO
卷 3, 期 11, 页码 3749-3761出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn900941e
关键词
hematite; ionic liquid; superstructures; porous materials; magnetic properties
类别
资金
- National Natural of Science Foundation of China [20571044, 20971070]
- Project Fundamental and Applied Research of Tianjin
The alpha-Fe2O3 with various morphologies has been successfully synthesized via an ionic liquid-assisted hydrothermal synthetic method. The samples are characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscope (FE-SEM), transmission electron microscopy, and high-resolution transmission electron microscopy. The results indicate that the as-prepared samples are alpha-Fe2O3 nanoparticles, mesoporous hollow microspheres, microcubes, and porous nanorods. The effects of the ionic liquid 1-n-butyl-3-methylimidazolium chloride ([bmim][Cl]) on the formation of the alpha-Fe2O3 with various morphologies have been investigated systematically, The proposed formation mechanisms have also been investigated on the basis of a series of FE-SEM studies of the products obtained at different durations. Because of the unique porous structure, the potential application in water treatment of the alpha-Fe2O3 porous nanorods was investigated. The UV-vis measurements suggest that the as-synthesized pure alpha-Fe2O3 with various morphologies possess different optical properties depending on the shape and size of the samples. The magnetic hysteresis measurements indicate the interesting magnetic property evolution in the as-prepared alpha-Fe2O3 samples, which is attributed to the superstructure or the shape anisotropy of the samples. This method is expected to be a useful technique for controlling the diverse shapes of crystalline inorganic materials for a variety of applications, such as sensors, gas and heavy metal ion adsorbents, catalytic fields, hydrogen and Li ion storage, and controlled drug delivery, etc.
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