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首页> 外文期刊>Nanotechnology >Synthesis of a alpha-Fe_2O_3 nanocrystal in its different morphological attributes: growth mechanism, optical and magnetic properties
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Synthesis of a alpha-Fe_2O_3 nanocrystal in its different morphological attributes: growth mechanism, optical and magnetic properties

机译：具有不同形态属性的α-Fe_2O_3纳米晶体的合成：生长机理，光学和磁性

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摘要

Nanospindle and nanorhombohedron and nanocube structured alpha-Fe_2O_3 was synthesized by the solvothermal method. An intermixing of ethylenediamine (EN) either with ethanol (EtOH) or water in different volume ratios (either 15:85, 50:50 or 85:15 in particular) was used to generate the structural forms of alpha-Fe_2O_3. The study showed that, during synthesis, EN functioned as a ligand and facilitated the growth of nanostructured samples. The probable growth mechanism is discussed in this paper. Field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM) investigations revealed that the nanostructures were formed through oriented attachment of primary nanocrystals. Fourier transform infrared spectroscopy (FTIR) results showed the presence of Fe-O or Fe-O-Fe vibrational bands whereas UV-vis-NIR optical absorbance spectra showed two prominent absorption bands around 540-560 and 670-680 nm. The room temperature magnetization measurement revealed that the remanence and coercivity depend on the morphological attributes of the nanocrystals. The magnetic hysteresis measurement also revealed that alpha-Fe_2O_3 nanostructures displayed weak ferromagnetic behaviour at room temperature.
机译：通过溶剂热法合成了纳米锭，纳米菱面体和纳米立方体结构的α-Fe_2O_3。乙二胺（EN）与乙醇（EtOH）或水以不同的体积比（特别是15：85、50：50或85:15）混合使用以生成α-Fe_2O_3的结构形式。研究表明，在合成过程中，EN充当配体并促进纳米结构样品的生长。本文讨论了可能的增长机制。场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）研究表明，纳米结构是通过原始纳米晶体的定向附着而形成的。傅里叶变换红外光谱（FTIR）结果表明存在Fe-O或Fe-O-Fe振动谱带，而UV-vis-NIR光学吸收谱表明在540-560和670-680 nm附近有两个突出的吸收谱带。室温磁化强度测量表明，剩磁和矫顽力取决于纳米晶体的形态属性。磁滞测量还表明，α-Fe_2O_3纳米结构在室温下显示出弱的铁磁行为。

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