Single crystalline electronic structure and growth mechanism of aligned square graphene sheets
Single crystalline electronic structure and growth mechanism of aligned square graphene sheets
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DOI：
10.1063/1.5012947
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发表时间：
2018-03
期刊：
影响因子：
6.1
通讯作者：
Haifeng Yang;Changkang Chen;Huan Wang;Zhongkai Liu;T. Zhang;Han Peng;N. B. M. Schröter;S. Ekahana;Juan Jiang;L. Yang;V. Kandyba;A. Barinov;Chaoyu Chen;J. Avila;M. Asensio;H. Peng;Zhongfan Liu;Yulin Chen
中科院分区：
文献类型：
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作者：
Haifeng Yang;Changkang Chen;Huan Wang;Zhongkai Liu;T. Zhang;Han Peng;N. B. M. Schröter;S. Ekahana;Juan Jiang;L. Yang;V. Kandyba;A. Barinov;Chaoyu Chen;J. Avila;M. Asensio;H. Peng;Zhongfan Liu;Yulin Chen
近年来，商用铜箔已成为一种高效、廉价的催化衬底，用于大面积石墨烯薄膜的可扩展生长，用于基础研究和应用。有趣的是，尽管石墨烯是六边形的蜂窝状晶格，但它可以在铜箔上生长成排列整齐的方形大薄片。本文采用亚微米空间分辨率的角分辨光发射光谱（微arpes）技术研究了在铜箔上生长的方形石墨烯片的三维电子结构，验证了单个方形石墨烯片及其合并区域（取向一致）的高质量。此外，通过同时测量石墨烯片及其衬底铜箔，我们不仅建立了（001）铜表面结构，而且还发现方形石墨烯片的侧面与⟨110⟩铜方向对齐，这表明铜衬底在方形石墨烯片的生长中起重要作用-这将有助于开发有效的方法来合成高质量的大尺寸规则形状的石墨烯片，以用于未来的应用。这项工作也证明了微arpes在探索原子厚度和亚微米横向尺寸的低维材料方面的有效性（例如，除了石墨烯，它还可以应用于过渡金属二硫族化合物和各种范德华异质结构）。最近，商用铜箔已成为一种高效且廉价的催化衬底，用于大面积石墨烯薄膜的可扩展生长，用于基础研究和应用。有趣的是，尽管石墨烯是六边形的蜂窝状晶格，但它可以在铜箔上生长成排列整齐的方形大薄片。本文采用亚微米空间分辨率的角分辨光发射光谱（微arpes）技术研究了在铜箔上生长的方形石墨烯片的三维电子结构，验证了单个方形石墨烯片及其合并区域（取向一致）的高质量。此外，通过同时测量石墨烯片和它们的衬底铜箔，我们不仅建立了（001）铜表面结构，而且还发现方形石墨烯片的侧面与⟨110⟩铜方向对齐，这表明铜衬底在方形石墨烯片的生长中起重要作用-这将使石墨烯片变得更加坚固。
Recently, commercially available copper foil has become an efficient and inexpensive catalytic substrate for scalable growth of large-area graphene films for fundamental research and applications. Interestingly, despite its hexagonal honeycomb lattice, graphene can be grown into large aligned square-shaped sheets on copper foils. Here, by applying angle-resolved photoemission spectroscopy with submicron spatial resolution (micro-ARPES) to study the three-dimensional electronic structures of square graphene sheets grown on copper foils, we verified the high quality of individual square graphene sheets as well as their merged regions (with aligned orientation). Furthermore, by simultaneously measuring the graphene sheets and their substrate copper foil, we not only established the (001) copper surface structure but also discovered that the square graphene sheets’ sides align with the ⟨110⟩ copper direction, suggesting an important role of copper substrate in the growth of square graphene sheets—which will help the development of effective methods to synthesize high-quality large-size regularly shaped graphene sheets for future applications. This work also demonstrates the effectiveness of micro-ARPES in exploring low-dimensional materials down to atomic thickness and sub-micron lateral size (e.g., besides graphene, it can also be applied to transition metal dichalcogenides and various van der Waals heterostructures)Recently, commercially available copper foil has become an efficient and inexpensive catalytic substrate for scalable growth of large-area graphene films for fundamental research and applications. Interestingly, despite its hexagonal honeycomb lattice, graphene can be grown into large aligned square-shaped sheets on copper foils. Here, by applying angle-resolved photoemission spectroscopy with submicron spatial resolution (micro-ARPES) to study the three-dimensional electronic structures of square graphene sheets grown on copper foils, we verified the high quality of individual square graphene sheets as well as their merged regions (with aligned orientation). Furthermore, by simultaneously measuring the graphene sheets and their substrate copper foil, we not only established the (001) copper surface structure but also discovered that the square graphene sheets’ sides align with the ⟨110⟩ copper direction, suggesting an important role of copper substrate in the growth of square graphene sheets—which will h...