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

被引：24
|
作者：
Kim, J. H.
Kim, J.
Park, J. H.
Kim, C. K.
Yoon, C. S. [1 ]
Shon, Y.
机构：
[1] Hanyang Univ, Div Engn & Mat Sci, Seoul 133791, South Korea
[2] Dongguk Univ, Quantum Funct Semicond Res Ctr, Seoul 100715, South Korea
来源：
NANOTECHNOLOGY | 2007年 / 18卷 / 11期
关键词：
D O I：
10.1088/0957-4484/18/11/115609
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A monolayer of 20 nm sized Fe3C 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 Fe3C particles when annealed above 600 degrees C. Carbon-encapsulated Fe3C nanoparticles with a narrow size distribution were produced by introducing two-step annealing to initially produce a monolayer of gamma-Fe2O3 particles which was converted into carbon-encapsulated Fe3C 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.
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页数：6
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