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Formation of Twinned Graphene Polycrystals
Jichen Dong1, Dechao Geng2, Fengning Liu1,3
1Center for Multidimensional Carbon Materials, Institute for Basic Science, Ulsan, 44919, Republic of Korea.
Angewandte Chemie (International Ed. in English)
|April 11, 2019
Summary
Graphene polycrystals grown on liquid copper unexpectedly show only 30°-twinned domains. This controlled alignment arises from island rotation and stable grain boundaries, guiding future 2D material synthesis.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Liquid metals are common substrates for growing 2D materials like graphene.
- Polycrystalline 2D materials typically exhibit random domain alignment due to island coalescence.
Purpose of the Study:
- To investigate the unexpected domain alignment in graphene polycrystals grown on liquid copper.
- To elucidate the mechanism behind the observed 30°-twinning in graphene.
Main Methods:
- Experimental growth of graphene on liquid copper.
- Atomic simulations to model graphene island behavior and grain boundary stability.
- In-depth analysis of polycrystal structures.
Main Results:
- Graphene polycrystals grown on liquid copper exclusively form 30°-twinned domains.
- Atomic simulations confirm free rotation of graphene islands and stable 30°-grain boundaries as the cause.
- Prediction and observation of 27 out of 30 possible 30°-twinned configurations.
Conclusions:
- The growth of 30°-twinned graphene on liquid copper is driven by unique surface dynamics and material properties.
- This finding enhances the fundamental understanding of polycrystal formation.
- Provides a guideline for the controlled synthesis of 2D materials with specific domain alignments.
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