氧化石墨的磁性：环氧基的作用
Magnetism in graphite oxide: The role of epoxy groups
摘要：
我们用可控氧化法研究了石墨的磁性。我们的方法使石墨成为绝缘体，同时保持其结构。傅里叶变换红外光谱和X射线吸收近边结构谱表明，氧化石墨表面含有环氧基团，不具有热稳定性。磁化率数据表现出负居里温度，场不可逆性，和缓慢的弛豫。环氧基被破坏后，磁性降低。总体结果表明，意外的磁性与环氧基团的存在有关。
英文摘要：
We investigate the magnetism in graphite by controlled oxidation. Our approach renders graphite an insulator while maintaining its structure. Fourier transform infrared spectroscopy and X-ray absorption near edge structure spectra reveal that graphite oxide has epoxy groups on its surface and it is not thermally stable. Magnetic susceptibility data exhibit negative Curie temperature, field irreversibility, and slow relaxation. The magnetic properties diminish after the epoxy groups are destroyed. The overall results indicate the unexpected magnetism is associated with the presence of epoxy groups.
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