Synthesis of Monodispersed Co(Fe)/Carbon Nanocomposite Microspheres with Very High Saturation Magnetization
Synthesis of Monodispersed Co(Fe)/Carbon Nanocomposite Microspheres with Very High Saturation Magnetization
复制标题
具有极高饱和磁化强度的单分散Co(Fe)/碳纳米复合微球的合成
DOI：
10.1021/jp810395j
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发表时间：
2009-03-12
影响因子：
3.7
通讯作者：
Wang, Changchun
中科院分区：
文献类型：
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作者：
Chu, Yiwen;Zhang, Peng;Wang, Changchun
通过在温和的条件下使聚丙烯腈（PAN）微球中的氰基与钴（铁）离子络合，可以有效地制备含钴（铁）的PAN微球，然后将复合微球在新西兰气氛下于800 ℃热分解，可以制备Co（Fe）/碳纳米复合微球，Co（Fe）/碳纳米复合微球中金属含量高达约71wt%。热重分析、透射电子显微镜和振动样品磁强计研究表明，几乎所有的钴纳米颗粒都嵌入到碳微球的内部，从而保护了金属纳米晶体（Co或Fe）不被氧化。该微球具有较高的磁化强度（Ms可达161 emu/g），室温下剩磁和矫顽力均接近于零（He可达0.012 KOe），是一种具有高磁导率和零磁滞损耗的优良软磁材料。
Through the complexation of cyano groups in polyacrylonitrile (PAN) microspheres with cobalt (iron) ions under mild conditions, cobalt (iron)-containing PAN microspheres could be prepared effectively, then after pyrolyzation of the composite microspheres at 800 C under NZ atmosphere, Co(Fe)/carbon nanocomposite microspheres could be prepared, and the metal content is up to similar to 71 wt % in the Co(Fe)/carbon nanocomposite microspheres. Thermogravimetric analysis, transmission electron microscopy, and vibrating sample magnetometry investigation proved that almost all the cobalt nanoparticles were embedded in the interior of the carbon microspheres, which protected the metal nanocrystals (Co or Fe) from oxidation. The microspheres possess high magnetization (Ms is up to similar to 161 emu/g) and show near-zero remanence and coercivity (He is down to similar to 0.012 KOe) at room temperature, suggesting that they are, outstanding soft ferromagnets with high magnetic susceptibilities and practically nil hysteresis loss.