Highly ordered CoFe2O4 nanowires array prepared via a modified sol-gel templated approach and its optical and magnetic properties
Highly ordered CoFe2O4 nanowires array prepared via a modified sol-gel templated approach and its optical and magnetic properties
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DOI：
10.1016/j.jallcom.2012.10.073
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发表时间：
2013-03-05
影响因子：
6.2
通讯作者：
Deng, Yuan
中科院分区：
文献类型：
--
作者：
Chen, Jingyi;Wang, Yao;Deng, Yuan
一维CoFe 2 O 4纳米线阵列由于其低维效应而具有独特的性质，具有广泛的应用前景。本文采用改进的溶胶-凝胶法，以阳极氧化铝为模板制备了CoFe 2 O 4纳米线阵列。通过X射线衍射、扫描电镜、透射电镜和拉曼光谱对样品进行了微观结构分析，结果表明样品中存在纯的CoFe 2 O 4相。纳米线由平均尺寸为15 nm的多晶CoFe 2 O 4纳米颗粒组成，光致发光光谱证明这导致带隙增加。此外，我们发现CoFe_2 O_4纳米线被非晶Al_2 O_3包覆，形成核壳结构。并对这种结构的形成机理进行了讨论。该纳米线阵列保持了CoFe 2 O 4块体材料良好的磁性，显示了应用的前景。(C)2012年爱思唯尔B。V.保留所有权利。
Highly ordered one-dimensional CoFe2O4 nanowires array possesses unique properties due to the low-dimensional effect, which make it a wide range of potential applications. In this paper, ordered CoFe2O4 nanowires array was prepared by a modified sol-gel method using anodic aluminum oxide template. Microstructure analysis performed by X-ray diffraction, scanning electron microscope, transmission electron microscope, and Raman spectra indicated the crystallization of pure CoFe2O4 phase. The nanowires were constituted by polycrystalline CoFe2O4 nanograins with an average size of 15 nm, which results in an increase of band gap as evidenced by photoluminescence spectra. Furthermore, we found that the CoFe2O4 nanowires were coated with amorphous Al2O3 forming a core-shell structure. The formation mechanism of this structure was discussed. The nanowires array preserved the good magnetic property of CoFe2O4 bulk material, showing the prospect for applications. (C) 2012 Elsevier B. V. All rights reserved.