Synthesis of Patched or Stacked Graphene and hBN Flakes: A Route to Hybrid Structure Discovery

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• 作者：Soo Min Kim ; Allen Hsu ; P. T. Araujo ; Yi-Hsien Lee ; Tom谩s Palacios ; Mildred Dresselhaus ; Juan-Carlos Idrobo ; Ki Kang Kim ; Jing Kong
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：March 13, 2013
• 年：2013
• 卷：13
• 期：3
• 页码：933-941
• 全文大小：732K
• 年卷期：v.13,no.3(March 13, 2013)
• ISSN：1530-6992

文摘

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, 鈥淎A-like鈥? slightly twisted stacking between graphene and hBN was observed with lattice orientation misalignment consistently to be <1掳. 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.

Keywords:

Boron nitride; graphene; hybrid; chemical vapor deposition; heterostructure