Synthesis of Patched or Stacked Graphene and hBN Flakes: A Route to Hybrid Structure Discovery
- Synthesis of Patched or Stacked Graphene and hBN Flakes: A Route to Hybrid Structure Discovery
- 김수민; Allen Hsu; P. T. Araujo; Yi-Hsien Lee; Tomas Palacios; Mildred Dresselhaus; Juan-Carlos Idrobo; 김기강; Jing Kong
- Boron nitride; chemical vapor deposition; graphene; hybrid; heterostructure
- Issue Date
- Nano letters
- VOL 13, NO 3, 933-941
- Two-dimensional (2D) materials such as
graphene and hexagonal boron nitride (hBN) have attracted
significant attention due to their remarkable properties.
Numerous interesting graphene/hBN hybrid structures have
been proposed but their implementation has been very limited.
In this work, the synthesis of patched structures through
consecutive chemical vapor deposition (CVD) on the same
substrate was investigated. Both in-plane junctions and stacked
layers were obtained. For stacked layers, depending on the
synthesis sequence, in one case turbostratic stacking with
random rotations were obtained. In another, “AA-like”, slightly
twisted stacking between graphene and hBN was observed
with lattice orientation misalignment consistently to be <1°. Raman characterizations not only confirmed that hBN is a superior
substrate but also revealed for the first time that a graphene edge with hBN passivation displays reduced D band intensity
compared to an open edge. These studies pave the way for the proposed well-ordered graphene/hBN structures and outline
exciting future directions for hybrid 2D materials.
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