Synthesis and characterization of magnetically active carbon nanofiber/iron oxide composites with hierarchical pore structures
Synthesis and characterization of magnetically active carbon nanofiber/iron oxide composites with hierarchical pore structures
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DOI：
10.1088/0957-4484/19/45/455612
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发表时间：
2008-11
期刊：
影响因子：
3.5
通讯作者：
J. E. Panels;Jinwoo Lee;Kang-Yeol Park;Seung-Yeon Kang;M. Márquez;Ulrich B Wiesner;Y. Joo
中科院分区：
文献类型：
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作者：
J. E. Panels;Jinwoo Lee;Kang-Yeol Park;Seung-Yeon Kang;M. Márquez;Ulrich B Wiesner;Y. Joo
以含氧化铁前驱体乙酰丙酮铁（AAI）的聚丙烯腈（PAN）溶液为原料，通过静电纺丝和热处理制备了具有分层孔结构的导电磁性纳米碳纤维垫。利用各种表征技术检测了所得到的多功能纳米纤维垫的形貌和材料性能，包括表面积和电、磁性能。扫描电镜图像显示，当纤维直径为~ 600 nm时，产生了均匀的纤维，并且当纤维直径为~ 330 nm时，石墨化后这种均匀的纤维形态保持不变。x射线衍射（XRD）和拉曼（Raman）研究表明，石墨和Fe3O4均在热处理后形成晶体，铁的存在可以增强石墨化。结合XRD和透射电镜实验，揭示了石墨纳米颗粒在纤维壁上形成的孔隙以及分布在纤维各处的磁铁矿纳米颗粒的形成。物理吸附实验表明，多功能纤维垫具有较高的比表面积（200-400 m2 g−1），其孔径取决于铁的添加量和石墨化条件。最后，我们证明了这些纤维不仅具有磁性，而且具有导电性。
Polyacrylonitrile (PAN) solution containing the iron oxide precursor iron (III) acetylacetonate (AAI) was electrospun and thermally treated to produce electrically conducting, magnetic carbon nanofiber mats with hierarchical pore structures. The morphology and material properties of the resulting multifunctional nanofiber mats including the surface area and the electric and magnetic properties were examined using various characterization techniques. Scanning electron microscopy images show that uniform fibers were produced with a fiber diameter of ∼600 nm, and this uniform fiber morphology is maintained after graphitization with a fiber diameter of ∼330 nm. X-ray diffraction (XRD) and Raman studies reveal that both graphite and Fe3O4 crystals are formed after thermal treatment, and graphitization can be enhanced by the presence of iron. A combination of XRD and transmission electron microscopy experiments reveals the formation of pores with graphitic nanoparticles in the walls as well as the formation of magnetite nanoparticles distributed throughout the fibers. Physisorption experiments show that the multifunctional fiber mats exhibit a high surface area (200–400 m2 g−1) and their pore size is dependent on the amount of iron added and graphitization conditions. Finally, we have demonstrated that the fibers are electrically conducting as well as magnetically active.