Periodic potentials in hybrid van der Waals heterostructures formed by supramolecular lattices on graphene.
Periodic potentials in hybrid van der Waals heterostructures formed by supramolecular lattices on graphene.
复制标题
DOI：
10.1038/ncomms14767
复制
发表时间：
2017-03-21
影响因子：
16.6
通讯作者：
Orgiu E
中科院分区：
文献类型：
--
作者：
Gobbi M;Bonacchi S;Lian JX;Liu Y;Wang XY;Stoeckel MA;Squillaci MA;D'Avino G;Narita A;Müllen K;Feng X;Olivier Y;Beljonne D;Samorì P;Orgiu E
二维材料的出现使得通过弱的面间货车德瓦尔斯相互作用形成异质结构成为可能。在这样的货车范德华异质结构中，2D周期性电势的出现显著地改变了堆叠内的单个片材的电子结构，因此调节了材料性质。然而，这些周期性电位是由相邻的2D材料的机械对准来确定的，这是繁琐且耗时的。在这里，我们表明，可编程的1D周期性电位超过104 nm 2的区域扩展和稳定的环境条件下出现时，石墨烯是由自组装的超分子晶格覆盖。通过使用光反应分子或其反应产物，可以在不改变其周期性的情况下修改电势的幅度和符号。在这方面，超分子晶格/石墨烯双层代表了完全无机的货车德瓦尔斯异质结构的混合类似物，突出了分子设计为创建特设材料提供的丰富前景。二维材料异质结构通过引入周期性电势而实现独特的电子特征。在这里，Gobbi等人使用具有可调一维周期势的单层超分子晶格来修改石墨烯的电子结构。
The rise of 2D materials made it possible to form heterostructures held together by weak interplanar van der Waals interactions. Within such van der Waals heterostructures, the occurrence of 2D periodic potentials significantly modifies the electronic structure of single sheets within the stack, therefore modulating the material properties. However, these periodic potentials are determined by the mechanical alignment of adjacent 2D materials, which is cumbersome and time-consuming. Here we show that programmable 1D periodic potentials extending over areas exceeding 104 nm2 and stable at ambient conditions arise when graphene is covered by a self-assembled supramolecular lattice. The amplitude and sign of the potential can be modified without altering its periodicity by employing photoreactive molecules or their reaction products. In this regard, the supramolecular lattice/graphene bilayer represents the hybrid analogue of fully inorganic van der Waals heterostructures, highlighting the rich prospects that molecular design offers to create ad hoc materials. Two-dimensional material heterostructures enable unique electronic features by introducing periodic potentials. Here, Gobbi et al. use a monolayer supramolecular lattice with a tunable one-dimensional periodic potential to modify the electronic structure of graphene.