arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0901.3624cond-mat.mtrl-sci
收藏

石墨烯-碳纳米管复合材料

Graphene-carbon nanotube composites

Elena F. Sheka, Leonid A. Chernozatonskii

摘要:

石墨烯-纳米管复合材料的形成解决了一些基本问题。首先,这两个合作伙伴是良好的电子供体和受体,这显着复杂的分子间相互作用,它们之间的基态能量项的双阱形状。第二个问题是有关奇电子字符的组件。类似于高芳烃和富勒烯,更大的C-C距离提供了纳米管和石墨烯中奇电子相互作用的相当大的削弱,这需要考虑奇电子的构型相互作用。为了避免严重的复杂性,自旋对称性破缺的方法使问题变得可行。此外,不受限制的对称性破缺Hartree-Fock方法具有独特的灵敏度,在揭示增强的化学活性的物种所造成的部分自由基的原子化学敏感性。沿着管和穿过它们的身体以及石墨烯片的化学敏感性曲线在适当的相关加成反应过程中形成了石墨烯-纳米管复合材料的计算合成的基础,并且使得可以选择复合材料的两个主要组,有条件地称为锤子和切割刀片结构。最终产品将取决于组合物的两种组分是可自由获得的还是其中一种是固定的。因此,在满足第一个要求的稀释溶液中,可以预期形成多加数切割刀片复合材料。同时,将碳纳米管或石墨烯片固定在基底上,可以形成锤状复合材料。一种特殊的“支架”复合材料被建议用于由一对纳米管固定的单个石墨烯片。

英文摘要:

The formation of graphen-nanotube composites addresses a few basic problems. First, both partners are good donors and acceptors of electrons, which significantly complicates the intermolecular interaction between them leading to a two-well shape of the ground state energy term. The second problem concerns odd-electron character of the components. Similarly to high aromatics and fullerenes, much larger C-C distances provide a considerable weakening of odd electrons interaction in nanotubes and graphene that necessitates taking the configurational interaction of odd electrons into account. Avoiding a severe complication, the broken spin-symmetry approach makes the problem feasible. Moreover, unrestricted broken-symmetry Hartree-Fock approach possesses a unique sensitivity in revealing enhanced chemical activity of the species caused by their partial radicalization in terms of atomic chemical susceptibility. The chemical susceptibility profiles along the tube and across their body as well as over graphene sheets form the ground of computational synthesis of graphen-nanotube composites in due course of the relevant addition reactions and make it possible to select two main groups of the composites, conditionally called hammer and cutting-blade structures. The final product will depend on whether both components of the composition are freely accessible or one of them is fixed. Thus, in diluted solutions where the first requirement is met, one can expect the formation of the multi-addend cutting-blade composites. Oppositely, when either nanotubes or graphene sheets are fixed on some substrates, the hammer composites will be formed. A particular "cradle" composite is suggested for an individual graphene sheet to be fixed by a pair of nanotubes.

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。

↑