碳包覆纳米铁镍磁性颗粒的合成

通过在双温控的化学气相沉积炉中热解四吡啶并卟啉铁镍混合物，合成了碳包覆铁镍纳米颗粒。原料中四吡啶并卟啉铁镍的质量比为7∶3；扫描电镜和透射电镜的结果显示碳包覆铁镍纳米颗粒形貌均匀，直径为100~300 nm；能谱结果显示碳包覆铁镍纳米颗粒是由铁、镍和碳组成；拉曼光谱证明产物有大量的缺陷存在，可能是由于球状结构上的碎片引起的；此外，磁性能测试表明室温下，碳包覆铁镍纳米颗粒有很高的饱和磁化强度，为56.3 emu·g^-1；而其产物的矫顽力趋近于零，呈超顺磁性，适合用于催化剂载体。

Synthesis of Carbon Coated Nano Fe-Ni Magnetic Particles

Carbon coated nano Fe-Ni particles (C-FeNi-Ps) have been synthesized through pyrolysis of metal tetrapyrazinoporphyrazines (MPTpzs,M=Fe2+,Ni2+,mFaPTipes∶mNiPTpes=7∶3) in a chemical vapor deposition furnace with two heating zones.The obtained C-FeNi-Ps show a uniform hair-bulb-like structure with diameter ranging from 100～300 nm; C-FeNi-Ps consist of C,Fe and Ni,and have lots of defects due to the edge planes on the ball structure,as supported by Raman spectrum.Besides,Hysteresis curve reveals that saturation magnetization (Ms)of C-FeNi-Ps is 56.3 emu ·g-1,and magnetic hysteresis tends to be 0,indicating superparamagnetic property,suitable for using as catalyst-support particles.