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Stacking sequence and interlayer coupling in few-layer graphene revealed by in situ imaging.
Zhu-Jun Wang1, Jichen Dong2, Yi Cui3
1Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Berlin-Dahlem D-14195, Germany.
Nature Communications
|October 21, 2016
Summary
Controlled growth of few-layer graphene is key to new electronic materials. This study uses real-time imaging and etching to understand graphene layer interactions and design synthesis protocols.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- The transition from graphene to graphite involves adding layers, each altering electronic properties.
- Controlled synthesis of few-layer graphene (FLG) is crucial for developing materials with tailored electronic structures.
Purpose of the Study:
- To investigate the stacking sequence and interlayer coupling in FLG.
- To understand the relationship between graphene-graphene and graphene-substrate interactions.
- To develop a powerful method for designing synthesis protocols for sp2 carbon nanostructures.
Main Methods:
- Isothermal growth and etching experiments.
- In situ scanning electron microscopy (SEM) for real-time imaging.
- Scanning tunneling microscopy (STM) and density functional theory (DFT) calculations.
Main Results:
- Layer-dependent etching rates reveal interaction strengths.
- Evidence of strong coupling between graphene edge atoms and platinum.
- Etching process confirmed as the reverse of growth.
Conclusions:
- Real-time imaging under controlled atmospheres is effective for designing synthesis of FLG and related sp2 nanostructures.
- Understanding interlayer coupling is vital for controlling material properties.
- This approach provides insights into the growth mechanisms of layered carbon materials.
