van der Waals Epitaxy of MoS2 Layers Using Graphene As Growth Templates

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• 作者：Yumeng Shi ; Wu Zhou ; Ang-Yu Lu ; Wenjing Fang ; Yi-Hsien Lee ; Allen Long Hsu ; Soo Min Kim ; Ki Kang Kim ; Hui Ying Yang ; Lain-Jong Li ; Juan-Carlos Idrobo ; Jing Kong
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：June 13, 2012
• 年：2012
• 卷：12
• 期：6
• 页码：2784-2791
• 全文大小：496K
• 年卷期：v.12,no.6(June 13, 2012)
• ISSN：1530-6992

文摘

We present a method for synthesizing MoS₂/Graphene hybrid heterostructures with a growth template of graphene-covered Cu foil. Compared to other recent reports,(1, 2) a much lower growth temperature of 400 掳C is required for this procedure. The chemical vapor deposition of MoS₂ on the graphene surface gives rise to single crystalline hexagonal flakes with a typical lateral size ranging from several hundred nanometers to several micrometers. The precursor (ammonium thiomolybdate) together with solvent was transported to graphene surface by a carrier gas at room temperature, which was then followed by post annealing. At an elevated temperature, the precursor self-assembles to form MoS₂ flakes epitaxially on the graphene surface via thermal decomposition. With higher amount of precursor delivered onto the graphene surface, a continuous MoS₂ film on graphene can be obtained. This simple chemical vapor deposition method provides a unique approach for the synthesis of graphene heterostructures and surface functionalization of graphene. The synthesized two-dimensional MoS₂/Graphene hybrids possess great potential toward the development of new optical and electronic devices as well as a wide variety of newly synthesizable compounds for catalysts.

Keywords:

Chemical vapor deposition; van der Waals epitaxy; molybdenum disulfide; graphene; STEM imaging