Preparation of magnetic graphitic carbon nitride nanocomposites

Preparation of magnetic graphitic carbon nitride nanocomposites
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磁性石墨氮化碳纳米复合材料的制备

DOI:
10.1016/j.matlet.2010.08.064
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发表时间:
2010-12
期刊:
影响因子:
3
通讯作者:
周春晖
周春晖
中科院分区:
材料科学3区
文献类型:
--
作者:
周春晖

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以氰胺和二氧化硅包覆的Fe2O3型纳米粒子为原料,通过热处理制备了磁性石墨碳氮化物纳米复合材料(MGCN)。氰胺在混合物中的热缩聚导致石墨化碳氮化物包裹了二氧化硅包覆的磁性铁物种,从而形成了MGCN纳米复合材料。用傅里叶变换红外光谱、粉末X射线衍射仪、扫描电子显微镜、透射电子显微镜和振动样品磁强计对样品进行了表征。MGCN纳米复合材料的平均粒径约为300 nm。该纳米复合材料具有顺磁性,其总磁化值为23.15emug−1。实验结果表明,在无氢的情况下,该工艺可以直接原位还原α-Fe2O3制备磁芯。提出了氰胺热缩聚生成纳米复合材料和NH3原位还原α-Fe2O3的可能机理。
Magnetic graphitic carbon nitride nanocomposites (MGCN) were prepared by thermal treatment of a mixture of cyanamide and silica-coated Fe2O3species nanoparticles. The thermal polycondensation of cyanamide in the mixture led to the encapsulation of silica-coated magnetic Fe species by graphitic carbon nitride, thereby forming MGCN nanocomposites. The samples were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy and vibration sample magnetometer. The average particle size of MGCN nanocomposites was ca. 300nm. The nanocomposites exhibited paramagnetic properties with a total magnetization value of 23.15emug−1. The experimental results showed that such a process can directly in situ reduce α-Fe2O3to yield magnetic cores in the absence of hydrogen. The possible mechanisms of the formation of MGCN nanocomposites and in situ reduction of α-Fe2O3by NH3from thermal polycondensation of cyanamide were proposed.
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