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Anisotropic electrical transport of flexible tungsten carbide nanostructures: towards nanoscale interconnects and electron emitters

机译:柔性碳化钨纳米结构的各向异性电气传输:朝向纳米级互连和电子发射器

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摘要

Due to the coexistence of metal-and ionic-bonds in a hexagonal tungsten carbide (WC) lattice, disparate electron behaviors were found in the basal plane and along the c-axial direction, which may create an interesting anisotropic mechanical and electrical performance. To demonstrate this, low-dimensional nanostructures such as nanowires and nanosheets are suitable for investigation because they usually grow in single crystals with special orientations. Herein, we report the experimental research regarding the anisotropic conductivity of [0001] grown WC nanowires and basal plane-expanded nanosheets, which resulted in a conductivity of 7.86 x 10(3) Omega(-1). m(-1) and 7.68 x 10(4) Omega(-1). m(-1) respectively. This conforms to the fact that the highly localized W d state aligns along the c direction, while there is little intraplanar directional bonding in the W planes. With advanced micro-manipulation technology, the conductivity of a nanowire was tested to be approximately constant, even under a considerable bending state. Moreover, the field electron emission of WC was evaluated based on large area emission and single nanowire (nanosheet) emission. A single nanowire exhibits a stable electron emission performance, which can output emission currents > 3 uA before fusing. These results provide useful references to assess low-dimensional WC nanostructures as electronic materials in flexible devices, such as nanoscale interconnects and electron emitters.
机译:由于六边形碳化钨(WC)晶格中的金属和离子键的共存,在基础平面和沿着C轴向方向上发现不同的电子行为,其可以产生有趣的各向异性机械和电气性能。为了证明这一点,诸如纳米线和纳米片之类的低维纳米结构适用于调查,因为它们通常以特殊取向的单个晶体生长。在此,我们报告了关于生长WC纳米线和基底平面膨胀的纳米片的各向异性导电性的实验研究,这导致导电率为7.86×10(3)Ω(-1)。 m(-1)和7.68 x 10(4)omega(-1)。 m(-1)分别。这符合高度局部化的W d状态沿着C方向对齐的事实,而W平面中几乎没有局部跨图的定向键合。利用先进的微操纵技术,即使在相当大的弯曲状态下,纳米线的电导率也被测试为近似恒定。此外,基于大面积发射和单纳米线(纳米晶片)发射来评估WC的现场电子发射。单个纳米线具有稳定的电子发射性能,可以在熔断之前输出发射电流> 3 UA。这些结果提供了有用的参考,以评估低维WC纳米结构作为柔性器件中的电子材料,例如纳米级互连和电子发射器。

著录项

  • 来源
    《Nanotechnology》 |2017年第44期|共9页
  • 作者

    Sun Bo; Sun Yong; Wang Chengxin;

  • 作者单位

    Sun Yat Sen Zhongshan Univ Key Lab Low Carbon Chem &

    Energy Conservat Guangd Sch Mat &

    Engn State Key Lab Optoelect Mat &

    Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Zhongshan Univ Key Lab Low Carbon Chem &

    Energy Conservat Guangd Sch Mat &

    Engn State Key Lab Optoelect Mat &

    Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Zhongshan Univ Key Lab Low Carbon Chem &

    Energy Conservat Guangd Sch Mat &

    Engn State Key Lab Optoelect Mat &

    Technol Guangzhou 510275 Guangdong Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    tungsten carbide; flexible; electrical transport; electron emitters;

    机译:碳化钨;柔性;电气运输;电子发射器;

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