Graphene-mediated stabilization of surface facets on metal substrates
Graphene-mediated stabilization of surface facets on metal substrates
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DOI：
10.1063/5.0065107
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发表时间：
2021-10-28
影响因子：
3.2
通讯作者：
Johnson, Harley T.
中科院分区：
文献类型：
--
作者：
Ananthakrishnan, Ganesh;Surana, Mitisha;Johnson, Harley T.
在化学气相沉积(CVD)后，在石墨烯覆盖区域的各种金属催化剂表面经常观察到刻面结构。尽管裸露的表面通过高扩散系数和高温预熔使其表面变平，但覆盖石墨烯的铜表面仍然呈现多面结构。通过原子模拟，我们证明了石墨烯在保持石墨烯-铜界面的刻面表面形态方面所起的作用，表现为抑制表面熔化和表面特定扩散。我们的分子动力学模拟结果与我们的实验观察结果相一致，并证实了石墨烯的热机械界面稳定作用。我们的研究提供了一个适用于大多数金属-石墨烯界面的理解，尤其是对大多数用于CVD生长石墨烯的金属催化剂。了解石墨烯与催化剂表面结构之间的相互作用对于制备超平整、无缺陷的石墨烯至关重要。
After Chemical Vapor Deposition (CVD), faceted structures are routinely observed on a variety of metal catalyst surfaces in the graphene-covered regions. In spite of having its bare surface flattened through high diffusivity and surface pre-melting at high temperatures, the graphene-covered copper surface still presents faceted structures. Using atomistic simulations, we show the role of graphene in the preservation of the faceted surface morphology at the graphene-copper interface, manifesting as a suppressant against surface melting and surface-specific diffusion. The results of our molecular dynamics simulations are consistent with our experimental observations and demonstrate the thermo-mechanical interfacial surface stabilization role of graphene. Our study provides an understanding applicable to most metal-graphene interfaces and is especially relevant to most metallic catalysts for graphene growth by CVD. Understanding the interaction between graphene and the catalyst surface structure is critical for producing ultra-flat and defect-free graphene.