• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Mechanistic study of the formation of graphene nanosheets with improved methodology.
【24h】

Mechanistic study of the formation of graphene nanosheets with improved methodology.

机译：用改进的方法研究石墨烯纳米片的形成机理。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Graphene is the 2D planar allotrope of carbon sought after for its exceptional electrical and mechanical properties. Graphene synthesis has been researched extensively since its experimental discovery by Geim in 2004, and research into the production of graphene has increased rapidly. This thesis investigated the production of graphene nanosheets by igniting magnesium turnings within the presence of dry ice. The aim of this study is to optimize the reaction conditions for industrial scalability and further understand the mechanism of formation.;Arc welding utilizes an electric discharge that produces a high, rapid temperature flux (3100°C) to weld metals together. This was applied to igniting Mg turnings within dry ice submerged in Ar, removing air and moisture. This optimized system allowed for higher production rates of graphene nanosheets. Rates of 60-80 grams of crude product were produced within one hour.;The mechanism of formation was better understood by the analysis of the crude product. Within the product was the presence of nanocubes ranging from approximately 2 to 500 nm in length. This thesis presents the hypothesis that these nanocubes are MgO coated with graphene. Hence, the morphology, size, and quality of the nanosheets are directly controlled by the formation of MgO nanocubes. This postulated is evident through the characterization methods of TEM, XRD, Raman spectroscopy, and EDX.
机译：石墨烯是碳的二维平面同素异形体，以其卓越的电气和机械性能而广受欢迎。自2004年Geim进行实验发现以来，对石墨烯的合成方法已经进行了广泛的研究，并且对石墨烯生产的研究也迅速增加。本文研究了在存在干冰的情况下通过点燃镁屑生成石墨烯纳米片的方法。这项研究的目的是优化工业可扩展性的反应条件，并进一步了解其形成机理。电弧焊利用放电产生高，快速的温度通量（3100°C）将金属焊接在一起。这被用于点燃浸在Ar中的干冰中的Mg转角，去除空气和水分。这种优化的系统可以提高石墨烯纳米片的生产率。一小时内可生产60-80克粗产物。通过对粗产物的分析，可以更好地理解其形成机理。在产品中存在长度约2至500 nm的纳米立方体。本论文提出了这样的假设，即这些纳米立方体是用石墨烯包覆的MgO。因此，纳米片的形态，大小和质量直接由MgO纳米立方体的形成来控制。通过TEM，XRD，拉曼光谱和EDX的表征方法可以明显看出这一点。

著录项

  • 作者

    Svenningsen, Glen Steven.;

  • 作者单位

    Northern Illinois University.;

  • 授予单位 Northern Illinois University.;
  • 学科 Materials science.;Nanotechnology.
  • 学位 M.S.
  • 年度 2013
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号