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.

引用

收藏

页数：6

相关论文

共 23 条

[1] Catalytic effect of nickel under carbonization of polyimide films [J].

Bin, YZ ;

Oishi, K ;

Koganemaru, A ;

Zhu, D ;

Matsuo, M .

CARBON, 2005, 43 (08) :1617-1627

[2] POLYIMIDES AS PRECURSORS FOR ARTIFICIAL CARBON [J].

BURGER, A ;

FITZER, E ;

HEYM, M ;

TERWIESCH, B .

CARBON, 1975, 13 (03) :149-157

[3] Synthesis of carbon nanotubes over Fe catalyst on aluminium and suggested growth mechanism [J].

Emmenegger, C ;

Bonard, JM ;

Mauron, P ;

Sudan, P ;

Lepora, A ;

Grobety, B ;

Züttel, A ;

Schlapbach, L .

CARBON, 2003, 41 (03) :539-547

[4] Interpretation of Raman spectra of disordered and amorphous carbon [J].

Ferrari, AC ;

Robertson, J .

PHYSICAL REVIEW B, 2000, 61 (20) :14095-14107

[5] CCVD synthesis and characterization of cobalt-encapsulated nanoparticles [J].

Flahaut, E ;

Agnoli, F ;

Sloan, J ;

O'Connor, C ;

Green, MLH .

CHEMISTRY OF MATERIALS, 2002, 14 (06) :2553-2558

[6] Direct conversion of iron stearate into magnetic Fe and Fe3C nanocrystals encapsulated in polyhedral graphite cages [J].

Geng, JF ;

Jefferson, DA ;

Johnson, BFG .

CHEMICAL COMMUNICATIONS, 2004, (21) :2442-2443

[7] Magnetic thin films of cobalt nanocrystals encapsulated in graphite-like carbon [J].

Hayashi, T ;

Hirono, S ;

Tomita, M ;

Umemura, S .

NATURE, 1996, 381 (6585) :772-774

[8] Low-temperature CVD synthesis of carbon-encapsulated magnetic Ni nanoparticles with a narrow distribution of diameters [J].

He, C. N. ;

Du, X. W. ;

Ding, J. ;

Shi, C. S. ;

Li, J. J. ;

Zhao, N. Q. ;

Cui, L. .

CARBON, 2006, 44 (11) :2330-2333

[9] STRUCTURE AND PROPERTIES OF HIGHLY CRYSTALLIZED GRAPHITE FILMS BASED ON POLYIMIDE KAPTON [J].

HISHIYAMA, Y ;

YASUDA, S ;

YOSHIDA, A ;

INAGAKI, M .

JOURNAL OF MATERIALS SCIENCE, 1988, 23 (09) :3272-3277

[10] Co-Pt alloy nanoparticles produced using a template of nanoparticle array [J].

Kim, Jung H. ;

Kim, Jeon ;

Kim, Chang K. ;

Yoon, Chong S. .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2006, 303 (01) :131-136