Graphene growth on Pt(111) and Au(111) using a MBE carbon solid-source
Graphene growth on Pt(111) and Au(111) using a MBE carbon solid-source
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DOI：
10.1016/j.diamond.2015.03.004
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发表时间：
2015-08-01
影响因子：
4.1
通讯作者：
Mendez, Javier
中科院分区：
文献类型：
--
作者：
Hernandez-Rodriguez, Irene;Garcia, Jorge M.;Mendez, Javier
在这项工作中，我们提出了一种分子束外延（MBE）生长方法，以获得贵金属上的石墨烯使用蒸发的碳原子在超高真空条件下从碳固体源。我们已经在不同的金属表面上合成了石墨烯（G）：从一个经过充分研究的铂衬底，到一个只能使用创新方法形成的衬底，就像金一样。对于石墨烯层的表征，我们使用了原位表面科学技术，如低能电子衍射（LEED），俄歇电子能谱（AES）和扫描隧道显微镜（STM）。我们方法的主要优点之一是形成石墨烯需要较低的表面温度。因此，通过在碳蒸发期间将Pt（111）和Au（111）衬底分别退火至高达650摄氏度和550摄氏度，我们已经获得了通常归因于这些表面上的石墨烯的特征LEED图。STM结果进一步证明了石墨烯的形成。对于Pt（111）上的G的情况，STM图像显示与对应于（111）铂表面上的单层石墨烯的莫尔图案相关联的长程有序。另一方面，G/Au（111）STM的结果表明，钉扎到原子台阶边缘的树枝状岛的形成。这种方法为在具有潜在技术应用的许多不同基底上形成石墨烯开辟了新的可能性。(C)2015 Elsevier B. V.版权所有。
In this work we present a Molecular Beam Epitaxy (MBE) growth method to obtain graphene on noble metals using evaporation of carbon atoms from a carbon solid-source in ultra-high vacuum conditions. We have synthesized graphene (G) on different metal surfaces: from a well studied substrate as platinum, to a substrate where it can only be formed using innovative methods, as is the case of gold. For the characterization of the graphene layers we have used in situ surface science techniques as low energy electron diffraction (LEED), auger electron spectroscopy (AES) and scanning tunneling microscopy (STM).One of the main advantages of our methodology is that low surface temperatures are required to form graphene. Thus, by annealing Pt(111) and Au(111) substrates up to 650 degrees C and 550 degrees C respectively during carbon evaporation, we have obtained the characteristic LEED diagrams commonly attributed to graphene on these surfaces. STM results further prove the formation of graphene. For the case of G on Pt(111), STM images show a long range ordering associated with moire patterns that correspond to a monolayer of graphene on (111) platinum surface. On the other hand, G/Au(111) STM results reveal the formation of dendritic islands pinned to atomic step edges. This method opens up new possibilities for the formation of graphene on many different substrates with potential technological applications. (C) 2015 Elsevier B.V. All rights reserved.