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arXiv 1601.02215cond-mat.mtrl-scicond-mat.mes-hall
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低表面能碳同素异形体:bcc-C6的情况

A low-surface energy carbon allotrope: the case for bcc-C6

Wen-Jin Yin, Yuan-Ping Chen, Yue-E. Xie, Li-Min Liu, S. B. Zhang

摘要:

石墨可被视为具有很少层-层相互作用的低表面能碳同素异形体。还可能存在其他低表面能但具有更强层-层相互作用的同素异形体。在这里,我们报告了一个已知的碳同素异形体,bcc-C6(体为中心的碳同素异形体与6个原子,每个原始单位),应该有非常低的表面能和小的尺寸依赖性下降到只有一对夫妇层厚度的第一性原理预测。这种独特的性质可以解释在生长过程中相对高能量的bcc-C6的存在。bcc-C6薄膜的电子性质也很有趣:(111)、(110)和(001)薄膜分别具有直接带隙、间接带隙和金属特性。薄层的受抑制的化学反应性在分裂后不会消失,因为锂掺杂(Li掺杂)3层(111)具有显著增加的H2分子结合能,最大存储容量为10.8wt%。

英文摘要:

Graphite may be viewed as a low-surface-energy carbon allotrope with little layer-layer interaction. Other low-surface-energy allotropes but with much stronger layer-layer interaction may also exist. Here, we report a first-principles prediction for one of the known carbon allotropes, bcc-C6 (a body centered carbon allotrope with six atoms per primitive unit) that should have exceptionally low-surface energy and little size dependence down to only a couple layer thickness. This unique property may explain the existence of the relatively-high-energy bcc-C6 during growth. The electronic properties of the bcc-C6thin layers can also be intriguing: the (111), (110), and (001) thin layers havedirect band gap, indirect band gap, and metallic character, respectively. The refrained chemical reactivity of the thin layers does not disappear after cleaving, as lithium-doped (Li-doped) 3-layers (111) has a noticeably increased binding energies of H2 molecules with a maximum storage capacity of 10.8 wt%.

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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