Synthesis and characterization of carbon-encapsulated magnetic nanoparticles via arc-plasma assisted CVD.
Synthesis and characterization of carbon-encapsulated magnetic nanoparticles via arc-plasma assisted CVD.
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DOI：
10.1166/jnn.2009.1757
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发表时间：
2009-12
影响因子：
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通讯作者：
Zhentao Li;Chao Hu;Chang Yu;J. Qiu
中科院分区：
文献类型：
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作者：
Zhentao Li;Chao Hu;Chang Yu;J. Qiu
采用电弧等离子体辅助化学气相沉积法在乙炔中制备了碳包覆磁性纳米颗粒。煤衍生的含金属（Fe，Co和Ni）的碳棒被用作阳极，而高纯度的石墨棒被用作阴极，在电弧过程中保持不变。采用TEM、XRD、拉曼光谱、N2吸附等温线和振动样品磁强计对所制备的CEMN进行了表征。所得CEMN的直径分布在10 ~ 70 nm之间，其中金属核的直径约为5-50 nm。Fe（C）纳米粒子的核相为体心立方Fe和正交Fe 3C，而Co（C）纳米粒子和Ni（C）纳米粒子的核相为面心立方结构。Fe（C）、Co（C）和Ni（C）纳米颗粒具有良好的石墨壳结构，比表面积分别为89 m2/g、72 m2/g和75 m2/g。CEMN表现出铁磁性，其特征在于剩余磁化强度（MR）与饱和磁化强度（MS）的比值。
Carbon-encapsulated magnetic nanoparticles (CEMNs) were fabricated on a large scale by arc-plasma assisted CVD in acetylene. The coal-derived metal-containing (Fe, Co and Ni) carbon rods were used as anodes, while a high-purity graphite rod was used as a cathode that remained unchanged during the arcing process. The CEMNs obtained were characterized by TEM, XRD, Raman spectroscopy, N2 adsorption isotherms and VSM. The diameter distribution of the obtained CEMNs varies from 10 to 70 nm, of which the metal cores are proximately 5-50 nm. The core phases in Fe(C) nanoparticles are body-centered cubic Fe and orthorhombic Fe3C while Co(C) nanoparticles and Ni(C) nanoparticles show the characteristic of a face-centered cubic structure. The Fe(C), Co(C) and Ni(C) nanoparticles with well-ordered graphitic shells have the surface area of 89 m2/g, 72 m2/g and 75 m2/g, respectively. The CEMNs show ferromagnetic of which was characterized by a ratio of remnant magnetization (MR) to saturation magnetization (MS).