期刊
NANO LETTERS
卷 19, 期 12, 页码 8526-8532出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03014
关键词
Stacking order; rhombohedral graphite; domains; zigzag; van der Waals assembly
类别
资金
- EPSRC Early Career Fellowship [EP/N007131/1]
- ERC H2020 Starter Grant EvoluTEM
- EPSRC [EP/P009050/1]
- EPSRC [EP/P009050/1, EP/K005014/1, EP/N007131/1] Funding Source: UKRI
In graphite crystals, layers of graphene reside in three equivalent, but distinct, stacking positions typically referred to as A, B, and C projections. The order in which the layers are stacked defines the electronic structure of the crystal, providing an exciting degree of freedom which can be exploited for designing graphitic materials with unusual properties including predicted high-temperature superconductivity and ferromagnetism. However, the lack of control of the stacking sequence limits most research to the stable ABA form of graphite. Here, we demonstrate a strategy to control the stacking order using van der Waals technology. To this end, we first visualize the distribution of stacking domains in graphite films and then perform directional encapsulation of ABC-rich graphite crystallites with hexagonal boron nitride (hBN). We found that hBN encapsulation, which is introduced parallel to the graphite zigzag edges, preserves ABC stacking, while encapsulation along the armchair edges transforms the stacking to ABA. The technique presented here should facilitate new research on the important properties of ABC graphite.
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