Facile One-pot Transformation of Iron Oxides from Fe2O3 Nanoparticles to Nanostructured Fe3O4@C Core-Shell Composites via Combustion Waves.
Facile One-pot Transformation of Iron Oxides from Fe2O3 Nanoparticles to Nanostructured Fe3O4@C Core-Shell Composites via Combustion Waves.
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DOI：
10.1038/srep21792
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发表时间：
2016-02-23
影响因子：
4.6
通讯作者：
Choi W
中科院分区：
文献类型：
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作者：
Shin J;Lee KY;Yeo T;Choi W
开发一种低成本、快速、大规模的纳米结构金属氧化物的合成和操作方法对于将具有不同实际应用的材料结合起来是至关重要的。在此，我们提出了一种简单的一锅合成方法，使用燃烧波，同时实现快速还原和直接形成的碳涂层的金属氧化物纳米结构。采用湿浸渍法制备了纳米Fe2O3/硝化纤维素杂化复合材料。我们证明，自传播燃烧波沿着的金属氧化物的表面和化学燃料之间的界面边界，使氧气从Fe2O3的释放。这种加速反应直接将Fe2O3转化为Fe3O4纳米结构。从红棕色Fe2O3到深灰色Fe3O4的独特颜色变化证实了氧化态的转变和材料基本性质的变化。此外，它同时形成了5 - 20 nm厚的碳层，覆盖所得Fe3O4纳米颗粒的表面，这可能有助于保持纳米结构并提高复合材料的导电性。这种新开发的在杂化纳米结构中使用燃烧波可以允许精确操纵其他金属氧化物纳米结构的化学组成，以及形成有机/无机杂化纳米结构。
The development of a low-cost, fast, and large-scale process for the synthesis and manipulation of nanostructured metal oxides is essential for incorporating materials with diverse practical applications. Herein, we present a facile one-pot synthesis method using combustion waves that simultaneously achieves fast reduction and direct formation of carbon coating layers on metal oxide nanostructures. Hybrid composites of Fe2O3 nanoparticles and nitrocellulose on the cm scale were fabricated by a wet impregnation process. We demonstrated that self-propagating combustion waves along interfacial boundaries between the surface of the metal oxide and the chemical fuels enabled the release of oxygen from Fe2O3. This accelerated reaction directly transformed Fe2O3 into Fe3O4 nanostructures. The distinctive color change from reddish-brown Fe2O3 to dark-gray Fe3O4 confirmed the transition of oxidation states and the change in the fundamental properties of the material. Furthermore, it simultaneously formed carbon layers of 5–20 nm thickness coating the surfaces of the resulting Fe3O4 nanoparticles, which may aid in maintaining the nanostructures and improving the conductivity of the composites. This newly developed use of combustion waves in hybridized nanostructures may permit the precise manipulation of the chemical compositions of other metal oxide nanostructures, as well as the formation of organic/inorganic hybrid nanostructures.