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arXiv 1007.0287cond-mat.mtrl-sci
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不同制备时间氧化石墨中的$sp^{2}$ / $sp^{3}$碳比

$sp^{2}$/$sp^{3}$ carbon ratio in graphite oxide with different preparation times

D. W. Lee, J. W. Seo

摘要:

氧化石墨是一种无定形绝缘体。虽然已经提出了几种模式,但其结构仍然存在争议。为了阐明这一问题,通过Brodie工艺和Staudenmaier工艺制备了5个样品。用X射线吸收近边结构研究了氧化石墨的电子结构,并用X射线光电子能谱研究了$sp^{2}$与$sp^{3}$键合碳原子的比例随样品制备时间的变化。发现该比率以指数方式接近0.3,特征时间为1.5周。我们认为,这一漫长的特征时间是结构仍然不清楚的原因。

英文摘要:

Graphite oxide is an amorphous insulator. Although several models have been suggested, its structure remains controversial. To elucidate this issue, 5 samples were prepared by the Brodie process and the Staudenmaier process. The electronic structure of graphite oxide was examined with x-ray absorption near edge structure and the ratio of $sp^{2}$ to $sp^{3}$ bonded carbon atoms was investigated with x-ray photoemission spectroscopy as a function of sample preparation times. It was found that this ratio approaches 0.3 exponentially with a characteristic time of 1.5 weeks. We believe this long characteristic time is the reason the structure has remained unclear.

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