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首页> 外文期刊>Journal of Materials Research >Coalescence of few layer graphene grains grown by chemical vapor deposition and their stacking sequence
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Coalescence of few layer graphene grains grown by chemical vapor deposition and their stacking sequence

机译：化学气相沉积生长的几层石墨烯晶粒的聚结及其堆积顺序

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摘要

Few layer graphene is attractive due to its extraordinary electronic and optical properties, which are strongly influenced by the orientation between the layers called as stacking sequence. It is challenging to synthesize high quality large size single or multi layer graphene crystals on the metal catalyst using chemical vapor deposition technique. The present work is about synthesis of few layer graphene grains on platinum foil using ambient pressure chemical together vapor deposition technique. The main focus is how the different grains coalesced and maintain the stacking sequence. Different characterization techniques are used to analyze the grains when they are in the process of merging to make a bigger grain. Scanning electron microscopy clearly shows different stacking sequences and merging of different nucleation sites of different grains. Interestingly, different stacking sequences are observed during the process of coalescence of grains. Raman spectroscopy gives accurate information about the number of layers and their stacking sequence. We observed Bernal AB and twisted layer stacking in the grains when they were combining together to grow into a bigger size. The full width at half maximum (FWHM) value of 2D Raman peaks appeared in the range of 52-69 cm~(-1) which shows an increase from the value of single layer graphene (30.18 cm~(-1)) and identifies Bernal stacking in grains. For twisted stacking FWHM values lie in the range of 19-32 cm~(-1).
机译：极少的石墨烯层因其非凡的电子和光学特性而具有吸引力，这受到层间定向（称为堆叠顺序）的强烈影响。使用化学气相沉积技术在金属催化剂上合成高质量的大尺寸单层或多层石墨烯晶体是具有挑战性的。当前的工作是关于使用环境压力化学气相沉积技术在铂箔上合成几层石墨烯晶粒。主要重点是不同的谷物如何合并并保持堆积顺序。当谷物处于合并过程中以制成更大的谷物时，会使用不同的表征技术来分析它们。扫描电子显微镜清楚地显示了不同的堆积顺序和不同晶粒的不同成核位置的合并。有趣的是，在晶粒合并过程中观察到了不同的堆叠顺序。拉曼光谱法可提供有关层数及其堆叠顺序的准确信息。我们观察到Bernal AB和扭曲层堆叠在一起时会堆积在晶粒中，从而长大。二维拉曼峰的半峰全宽（FWHM）值出现在52-69 cm〜（-1）的范围内，表明比单层石墨烯的值（30.18 cm〜（-1））有所增加，并表明伯纳尔堆积在谷物中。对于扭曲堆叠，FWHM值在19-32 cm〜（-1）的范围内。

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  • 来源
    《Journal of Materials Research》 |2016年第1期|46-54|共9页
  • 作者

    Shumaila Karamat; Selda Sonusen; Munir Dede; Yigit Uysalli; Ekin OEzgoenuel; Ahmet Oral;

  • 作者单位

    Department of Physics, Middle East Technical University, Ankara 06800, Turkey and Department of Physics, COMSATS Institute of Information Technology, Islamabad 5400, Pakistan;

    Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul 34956, Turkey;

    NanoMagnetics Instruments Ltd., Ankara 06800, Turkey;

    Department of Physics, Middle East Technical University, Ankara 06800, Turkey;

    Department of Physics, Middle East Technical University, Ankara 06800, Turkey;

    Department of Physics, Middle East Technical University, Ankara 06800, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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