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首页> 外文期刊>Crystal growth & design >Nanocystals of hematite with unconventional shape-truncated hexagonal bipyramid and its optical and magnetic properties
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Nanocystals of hematite with unconventional shape-truncated hexagonal bipyramid and its optical and magnetic properties

机译：具有非常规形状截断六角形双锥体的赤铁矿纳米囊及其光学和磁性

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摘要

The capping agent plays a critical function in anisotropic crystal growth to induce polyhedral morphology of a nanocrystal. Uniform and single-crystalline a-Fe _2O _3 polyhedral nanoparticles in the hexagonal single crystal system named truncated hexagonal bipyramid for the first time were successfully synthesized by a facile one-step hydrothermal method with the aid of carboxymethyl cellulose and hydrazine molecules. The appearance and crystal structure of these iron oxide nanoparticles were characterized in detail by physicochemical methods. The results show that the as-synthesized a-Fe _2O _3 particles are bound by 12 same-side crystalline facets {101} and two other same facets {001} at the tops. These obtained iron oxide particles belong to a pure hematite phase, and the particle size is around 400 nm. The optical property of the assynthesized product was analyzed, and the determined indirect band gap value Eg is 2.08 eV. The magnetic property studies of truncated hexagonal bipyramid hematite particles have shown that this kind of a-Fe _2O _3 possess a weak ferromagnetism under the TM, and the saturation points do not reach up to the maximum applied magnetic field. Role of the reactants was discussed and investigated systematically in the work. Furthermore, a schematic illustration for the probable formation of this a-Fe2O3 morphology in whole of the synthetic process was also proposed.
机译：封端剂在各向异性晶体生长中起关键作用，以诱导纳米晶体的多面体形态。借助羧甲基纤维素和肼分子，通过简便的一步水热方法成功地首次成功地合成了六方单晶六方六面体的均相和单晶a-Fe _2O _3多面体纳米粒子。通过物理化学方法详细表征了这些氧化铁纳米颗粒的外观和晶体结构。结果表明，合成后的α-Fe_2O _3粒子在顶部被12个相同侧面的结晶小面{101}和另外两个相同侧面{001}束缚。这些获得的氧化铁颗粒属于纯赤铁矿相，并且粒径为约400nm。分析了合成产物的光学性质，确定的间接带隙值Eg为2.08eV。截断的六方双锥型赤铁矿颗粒的磁性研究表明，这种a-Fe _2O _3在TM下具有弱的铁磁性，并且饱和点未达到最大施加磁场。在工作中系统地讨论和调查了反应物的作用。此外，还提出了在整个合成过程中可能形成这种α-Fe2O3形态的示意图。

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