Slip‐Line‐Guided Growth of Graphene

Autor: Yanglizhi Li, Haiyang Liu, Zhenghua Chang, Haoxiang Li, Shenxing Wang, Li Lin, Hailin Peng, Yujie Wei, Luzhao Sun, Zhongfan Liu
Rok vydání: 2022
Předmět:
Zdroj: Advanced Materials. 34:2201188
ISSN: 1521-4095
0935-9648
Popis: Manipulating the crystal orientation of emerging 2D materials via chemical vapor deposition (CVD) is a key premise for obtaining single-crystalline films and designing specific grain-boundary (GB) structures. Herein, the controllable crystal orientation of graphene during the CVD process is demonstrated on a single-crystal metal surface with preexisting atomic-scale stair steps resulting from dislocation slip lines. The slip-line-guided growth principle is established to explain and predict the crystal orientation distribution of graphene on a variety of metal facets, especially for the multidirectional growth cases on Cu(hk0) and Cu(hkl) substrates. Not only large-area single-crystal graphene, but also bicrystal graphene with controllable GB misorientations, are successfully synthesized by rationally employing tailored metal substrate facets. As a demonstration, bicrystal graphenes with misorientations of ≈21° and ≈11° are constructed on Cu(410) and Cu(430) foils, respectively. This guideline builds a bridge linking the crystal orientation of graphene and the substrate facet, thereby opening a new avenue for constructing bicrystals with the desired GB structures or manipulating 2D superlattice twist angles in a bottom-up manner.
Databáze: OpenAIRE
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