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首页> 美国卫生研究院文献>Scientific Reports >Water-assisted and controllable synthesis of core/shell/shell structured carbon-based nanohybrids and their magnetic and microwave absorption properties
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Water-assisted and controllable synthesis of core/shell/shell structured carbon-based nanohybrids and their magnetic and microwave absorption properties

机译：核/壳/壳结构碳纳米杂化物的水辅助可控合成及其磁和微波吸收性能

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By controlling the pyrolysis temperature, core/shell/shell structured Fe/Fe5C2/carbon nanotube bundles (Fe/Fe5C2/CNTBs), Fe/Fe3C/helical carbon nanotubes (Fe/Fe3C/HCNTs) and Fe/Fe3C/chain-like carbon nanospheres (Fe/Fe3C/CCNSs) with high encapsulation efficiency could be selectively synthesized in large-scale by water-assisted chemical vapor deposition method. Water vapor was proved to play an important role in the growth process. Because of α-Fe nanoparticles tightly wrapped by two layers, the obtained core/shell/shell structured nanohybrids showed high stabilities and good magnetic properties. The minimum reflection loss values of the as-prepared nanohybrids reached approximately −15.0, −46.3 and −37.1 dB, respectively. The excellent microwave absorption properties of the as-prepared core/shell/shell structured nanohybrids were considered to the quarter-wavelength matching model. Moreover, the possible enhanced microwave absorption mechanism of the as-prepared Fe/Fe3C/HCNTs and Fe/Fe3C/CCNSs were discussed in details. Therefore, we proposed a simple, inexpensive and environment-benign strategy for the synthesis of core/shell/shell structured carbon-based nanohybrids, exhibiting a promising prospect as high performance microwave absorbing materials.
机译：通过控制热解温度，可形成核/壳/壳结构的Fe / Fe5C2 /碳纳米管束（Fe / Fe5C2 / CNTBs），Fe / Fe3C /螺旋碳纳米管（Fe / Fe3C / HCNTs）和Fe / Fe3C /链状碳利用水辅助化学气相沉积法可以选择性地大规模合成高包封率的纳米球（Fe / Fe3C / CCNSs）。事实证明，水蒸气在生长过程中起着重要作用。由于α-Fe纳米颗粒被两层紧密包裹，因此获得的核/壳/壳结构纳米杂化物表现出高稳定性和良好的磁性。所制备的纳米杂化物的最小反射损耗值分别达到约-15.0，-46.3和-37.1 dB。将所制备的核/壳/壳结构的纳米杂化物的优异的微波吸收特性考虑到四分之一波长匹配模型。此外，详细讨论了所制备的Fe / Fe3C / HCNTs和Fe / Fe3C / CCNSs可能增强的微波吸收机理。因此，我们提出了一种简单，廉价且对环境有益的策略，用于合成核/壳/壳结构的碳基纳米杂化物，作为高性能微波吸收材料具有广阔的前景。

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