Synthesis of Fe-filled carbon nanocapsules by an electric plasma discharge in an ultrasonic cavitation field of liquid ethanol
Synthesis of Fe-filled carbon nanocapsules by an electric plasma discharge in an ultrasonic cavitation field of liquid ethanol
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DOI：
10.1557/jmr.2006.0316
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发表时间：
2006-10
影响因子：
2.7
通讯作者：
R. Sergiienko;E. Shibata;Z. Akase;Hiroyuki Suwa;D. Shindo;Takashi Nakamura
中科院分区：
文献类型：
--
作者：
R. Sergiienko;E. Shibata;Z. Akase;Hiroyuki Suwa;D. Shindo;Takashi Nakamura
利用超声空化技术在乙醇溶液中产生等离子体，制备了包裹在多层石墨片中的纳米级Fe 3C和χ-Fe2.5C。退火改变了碳纳米管的相组成、结构和尺寸，因为大部分的碳化铁分解成α-Fe相和石墨。在873 K和973 K退火的粉末样品的最大饱和磁化强度值分别为80.6 A m^2/kg和83.4 A m^2/kg，约为块状铁的40%。使用这种方法，将有可能通过选择合适的材料用于超声尖端和电极来合成由石墨壳封装的所选金属的纳米颗粒。
Nanoparticles of iron carbides (Fe_3C and χ-Fe_2.5C) wrapped in multilayered graphitic sheets were synthesized by a developed method in which an electric plasma was generated in an ultrasonic cavitation field containing thousands of tiny activated bubbles in liquid ethanol. Annealing changed the phase composition, structure, and size of the carbon nanocapsules as most of the iron carbides decomposed into the α-Fe phase and graphite. Powder samples annealed at 873 and 973 K have maximal saturation magnetization values equal to 80.6 and 83.4 A m^2/kg, respectively, which is approximately 40% of the value of bulk iron. Using this method, it will be possible to synthesize nanoparticles of a metal of choice encapsulated by graphite shells by selecting appropriate materials for the ultrasonic tip and electrodes.