Unconventional Atomic Structure of Graphene Sheets on Solid Substrates
Unconventional Atomic Structure of Graphene Sheets on Solid Substrates
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固体基底上石墨烯片的非常规原子结构
DOI：
10.1002/smll.201902637
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发表时间：
2019
期刊：
影响因子：
13.3
通讯作者：
Zhang Yi
中科院分区：
文献类型：
--
作者：
Zhang Jinjin;Yang Yizhou;Yang Shuo;Song Jie;Wang Ying;Liu Xiaoguo;Yang Qingqing;Shen Yue;Wang Shuo;Yang Haijun;Lu Junhong;Li Bin;Fang Haiping;Lal Ratnesh;Czajkowsky Daniel M.;Hu Jun;Shi Guosheng;Zhang Yi
独立式石墨烯的原子结构包括具有2.5 π周期的平坦六方环，这通常被认为是唯一的原子周期，并决定了石墨烯的独特性质。在这里，直接观察到石墨烯的意想不到的高度有序的正交结构，其晶格常数为0.5 μ m，自发地形成在各种衬底上。第一性原理计算表明，这种非常规结构可以归因于石墨烯表面和衬底之间的偶极子，其产生界面电场并诱导石墨烯表面上的原子重排。此外，可以通过人工产生的界面电场来控制正交结构的形成。重要的是，5 μ m晶体可以以连续和可逆的方式进行操纵和转化。值得注意的是，正交晶格可以控制淀粉样蛋白的外延自组装。这些发现揭示了关于石墨烯原子结构的新见解，并开辟了操纵石墨烯晶格的新途径。
The atomic structure of free‐standing graphene comprises flat hexagonal rings with a 2.5 Å period, which is conventionally considered the only atomic period and determines the unique properties of graphene. Here, an unexpected highly ordered orthorhombic structure of graphene is directly observed with a lattice constant of ≈5 Å, spontaneously formed on various substrates. First‐principles computations show that this unconventional structure can be attributed to the dipole between the graphene surface and substrates, which produces an interfacial electric field and induces atomic rearrangement on the graphene surface. Further, the formation of the orthorhombic structure can be controlled by an artificially generated interfacial electric field. Importantly, the 5 Å crystal can be manipulated and transformed in a continuous and reversible manner. Notably, the orthorhombic lattice can control the epitaxial self‐assembly of amyloids. The findings reveal new insights about the atomic structure of graphene, and open up new avenues to manipulate graphene lattices.