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arXiv 0912.0085cond-mat.mtrl-scicond-mat.mes-hall
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石墨烯的氧化态:计算光谱学的启示

Oxidation States of Graphene: Insights from Computational Spectroscopy

Wenhua Zhang, Vincenzo Carravetta, Zhenyu Li, Yi Luo, Jinlong Yang

摘要:

当它被氧化时,石墨可以容易地剥离形成氧化石墨烯(GO)。GO是大量生产石墨烯的关键中间体,也是一种具有多种应用潜力的重要材料。由于许多不同的氧化物种随机分布在基底平面上,GO具有复杂的非化学计量原子结构,尽管涉及许多实验技术的深入研究,但仍然没有很好地理解。在实验数据解释中经常存在争议。本文用第一性原理研究了GO中碳1 s轨道的结合能。计算结果可以很好地解释X射线光电子能谱学(XPS)实验数据,并提供统一的谱线归属。基于对XPS的第一性原理理解,提出了一个含有新氧化物种环氧对和环氧-羟基对的GO结构模型。我们的研究结果表明,第一性原理计算光谱提供了一个强大的手段来研究GO结构。

英文摘要:

When it is oxidized, graphite can be easily exfoliated forming graphene oxide (GO). GO is a critical intermediate for massive production of graphene, and it is also an important material with various application potentials. With many different oxidation species randomly distributed on the basal plane, GO has a complicated nonstoichiometric atomic structure that is still not well understood in spite of of intensive studies involving many experimental techniques. Controversies often exist in experimental data interpretation. We report here a first principles study on binding energy of carbon 1s orbital in GO. The calculated results can be well used to interpret experimental X-ray photoelectron spectroscopy (XPS) data and provide a unified spectral assignment. Based on the first principles understanding of XPS, a GO structure model containing new oxidation species epoxy pair and epoxy-hydroxy pair is proposed. Our results demonstrate that first principles computational spectroscopy provides a powerful means to investigate GO structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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