Chemical vapor deposition growth of large single-crystal bernal-stacked bilayer graphene from ethanol
Chemical vapor deposition growth of large single-crystal bernal-stacked bilayer graphene from ethanol
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DOI：
10.1016/j.carbon.2016.06.078
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发表时间：
2016-10-01
期刊：
影响因子：
10.9
通讯作者：
Maruyama, Shigeo
中科院分区：
文献类型：
--
作者：
Chen, Xiao;Xiang, Rong;Maruyama, Shigeo
使用乙醇作为前体，单晶双层石墨烯域的尺寸高达数百微米，迄今为止报道的最大的之一，通过化学气相沉积（CVD）在铜箔上合成。拉曼光谱分析表明，双层膜是均匀的AB-堆叠，具有非常低的D-带强度。选区电子衍射分析也证实了bernal堆垛秩序和大面积结晶。令人惊讶的是，在CVD中降低乙醇压力显示出从自限性单层到多层石墨烯的明确的胎面，并且存在窄的乙醇压力窗口，这对于形成大畴双层石墨烯是优选的。这表明了乙醇在石墨烯生长中的双重作用，并证明了不同石墨烯层的形成可以通过仔细调节单个参数来控制：乙醇压力。(C)2016爱思唯尔有限公司版权所有
Using ethanol as a precursor, single-crystal bilayer graphene domains with dimensions up to hundreds of micrometer, one of the largest reported so far, were synthesized on Cu foils by chemical vapor deposition (CVD). Raman spectroscopy analysis revealed that the bilayers are homogeneously AB-stacked, with very low D-band intensity. Selected area electron diffraction analysis also confirmed the bernal stacking order and the large area crystallinity. Surprisingly, decreasing ethanol pressure in CVD shows an unambiguous tread from self-limited single layer to a multi-layer graphene, and there exists a narrow window of ethanol pressure which is preferred for the formation of large domain bilayer graphene. This suggests the dual effect of ethanol in graphene growth and demonstrates that the formation of different layers of graphene can be controlled by carefully tuning single parameter: ethanol pressure. (C) 2016 Elsevier Ltd. All rights reserved.