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Electron energy-loss spectroscopy characterization and microwave absorption of iron-filled carbon-nitrogen nanotubes

机译：铁填充碳氮纳米管的电子能量损失谱表征和微波吸收

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摘要

Iron-filled carbon-nitrogen ( Fe/CNx) nanotubes and iron-filled carbon ( Fe/C) nanotubes were synthesized at 900 degrees C through a pyrolysis reaction of ferrocene/acetonitrile and ferrocene/xylene, respectively. The differences of structure and composition between the Fe/CNx nanotubes and Fe/C nanotubes were investigated by transmission electron microscopy and electron energy-loss spectroscopy ( EELS). It was found that the morphology of Fe/CNx nanotubes is more corrugated than that of the Fe/C nanotubes due to the incorporation of nitrogen. By comparing the Fe L-2,L-3 electron energy-loss spectra of Fe/CNx nanotubes to those of the Fe/C nanotubes, the electron states at the interface between Fe and the tubular wall of both Fe/CNx nanotubes and Fe/C nanotubes were investigated. At the boundary between Fe and the wall of a CNx nanotube, the additional electrons contributed from the doped 'pyridinic-like' nitrogen might transfer to the empty 3d orbital of the encapsulated iron, therefore leading to an intensity suppression of the iron L-2,L-3 edge and an intensity enhancement of the carbon K edge. However, such an effect could not be found in Fe/C nanotubes. Microwave absorption properties of both Fe/CNx and Fe/C nanocomposites at 2-18 GHz band were studied.
机译：分别通过二茂铁/乙腈和二茂铁/二甲苯的热解反应在900摄氏度下合成了铁填充的碳氮（Fe / CNx）纳米管和铁填充的碳（Fe / C）纳米管。通过透射电子显微镜和电子能量损失谱（EELS）研究了Fe / CNx纳米管和Fe / C纳米管在结构和组成上的差异。发现由于氮的引入，Fe / CNx纳米管的形态比Fe / C纳米管的波纹更波纹。通过比较Fe / CNx纳米管的Fe L-2，L-3电子能谱和Fe / C纳米管的电子能谱，电子在Fe与Fe / CNx纳米管和Fe的管壁之间的界面处研究了/ C纳米管。在Fe和CNx纳米管壁之间的边界处，由掺杂的“吡啶样”氮贡献的额外电子可能转移到封装铁的空3d轨道上，因此导致了铁L-2的强度抑制，L-3边缘和碳K边缘的强度增强。但是，在Fe / C纳米管中未发现这种效果。研究了Fe / CNx和Fe / C纳米复合材料在2-18 GHz频段的微波吸收特性。

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