通过电弧等离子体辅助化学气相沉积法合成及表征碳包覆磁性纳米颗粒

Synthesis and characterization of carbon-encapsulated magnetic nanoparticles via arc-plasma assisted CVD.

作者信息

Li Zhentao, Hu Chao, Yu Chang, Qiu Jieshan

机构信息

Carbon Research Laboratory, Center for Nano Materials and Science, State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, PO Box 49, Dalian 116012, China.

出版信息

J Nanosci Nanotechnol. 2009 Dec;9(12):7473-6. doi: 10.1166/jnn.2009.1757.

DOI:10.1166/jnn.2009.1757

PMID:19908811

Abstract

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).

摘要

通过电弧等离子体辅助化学气相沉积法在乙炔中大规模制备了碳包覆磁性纳米颗粒（CEMNs）。以煤衍生的含金属（铁、钴和镍）碳棒为阳极，同时使用高纯度石墨棒作为阴极，该阴极在电弧过程中保持不变。对所得的CEMNs进行了透射电子显微镜（TEM）、X射线衍射（XRD）、拉曼光谱、N₂吸附等温线和振动样品磁强计（VSM）表征。所得CEMNs的直径分布在10至70nm之间，其中金属核的直径约为5至50nm。Fe(C)纳米颗粒的核心相为体心立方铁和正交晶系Fe₃C，而Co(C)纳米颗粒和Ni(C)纳米颗粒表现出面心立方结构的特征。具有有序石墨壳的Fe(C)、Co(C)和Ni(C)纳米颗粒的表面积分别为89m²/g、72m²/g和75m²/g。CEMNs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）之比。