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Characteristics of graphene quantum dots determined by edge structures: three kinds of dots fabricated using thermal plasma jet

机译：边缘结构确定的石墨烯量子点的特性：使用热等离子体射流制造的三种点

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摘要

When a graphene sheet is cut along zigzag lines, carbene edges having two unshared valence electrons at each edge carbon atom are obtained, while along the armchair lines, carbyne edges having carbon triple bonds are obtained. Carbene and carbyne edges have polar and nonpolar characters, respectively. 90 degree corners are obtained when armchair and zigzag lines are encountered, while 120 degree corners are obtained when the same type of lines are encountered. Therefore, hexagonal graphene quantum dots (GQDs) are obtained when the same type of cutting lines are encountered at all the corners, while rectangular GQDs are obtained when different types of cutting lines are encountered. We have fabricated three types of GQDs by a gas phase collision reaction using a thermal plasma jet. Zigzag GQDs having only carbene edges were dispersed in polar solvents and they had basic hexagonal shapes. Armchair GQDs having only carbyne edges were dispersed in nonpolar solvents and they also had basic hexagonal shapes. Hybrid GQDs having both carbyne and carbene edges in each dot were dispersed in both polar and nonpolar solvents and had rectangular shapes. The photoluminescence and photoluminescence excitation spectra of hybrid GQDs responded to the combination of the spectra of zigzag and armchair GQDs.
机译：当沿曲折线切割石墨烯片时，获得在每个边缘碳原子处具有两个未共同的价电子的卡贝边缘，同时沿着扶手椅线，获得具有碳三键的Carbyne边缘。卡宾和卡比边缘分别具有极性和非极性字符。当遇到扶手椅和曲折线时，获得90度角，而当遇到相同类型的线时，获得120度角。因此，当在所有角落遇到相同类型的切割线时，获得六边形石墨烯量子点（GQDS），而当遇到不同类型的切割线时，则获得矩形GQD。我们通过使用热等离子体射流通过气相碰撞反应制造了三种类型的GQD。 Zigzag GQD只有卡宾边缘分散在极性溶剂中，它们具有基本的六边形形状。只有Carbyne边缘的扶手椅GQD分散在非极性溶剂中，它们也具有基本的六边形形状。在每个点中具有Carbyne和Carbene边缘的杂交GQD分散在极性和非极性溶剂中并具有矩形形状。杂交地GQD的光致发光和光致发光激发光谱响应Z字形和扶手椅GQDS的光谱的组合。

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  • 来源
    《RSC Advances》 |2015年第83期|共7页
  • 作者

    Lee Myung Woo; Kim Juhan; Suh Jung Sang;

  • 作者单位

    Seoul Natl Univ Dept Chem Lab Seoul 151747 South Korea;

    Seoul Natl Univ Dept Chem Lab Seoul 151747 South Korea;

    Seoul Natl Univ Dept Chem Lab Seoul 151747 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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