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Synthesis of carbon-encapsulated iron carbide nanoparticles on a polyimide thin film

机译:聚酰亚胺薄膜上碳包覆的碳化铁纳米粒子的合成

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摘要

A monolayer of 20 nm sized Fe_3C nanoparticles encapsulated by graphite was fabricated by heat treating a polyimide/Fe/polyimide thin-film stack. Transmission electron microscopy and Raman spectroscopy confirmed the graphitization of the polyimide film in the vicinity of the Fe_3C particles when annealed above 600 deg C. Carbon-encapsulated Fe_3C nanoparticles with a narrow size distribution were produced by introducing two-step annealing to initially produce a monolayer of y-Fe_2O_3 particles which was converted into carbon-encapsulated Fe_3C nanoparticles during the second annealing stage. The thus-produced nanoparticles exhibited a saturation magnetization of 55.4 emu g~(-1) and coercivity of 360 Oe at room temperature.
机译:通过对聚酰亚胺/ Fe /聚酰亚胺薄膜叠层进行热处理,制备了由石墨包裹的20 nm尺寸的Fe_3C纳米颗粒单层。透射电子显微镜和拉曼光谱证实,当在600摄氏度以上退火时,Fe_3C颗粒附近的聚酰亚胺薄膜会发生石墨化。通过引入两步退火以初步制备单层膜,制得了窄尺寸分布的碳包裹Fe_3C纳米颗粒y-Fe_2O_3颗粒的数量,在第二个退火阶段将其转化为碳包裹的Fe_3C纳米颗粒。如此产生的纳米颗粒在室温下表现出55.4emu g·(-1)的饱和磁化强度和360Oe的矫顽力。

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