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首页> 外文期刊>Journal of Materials Research >Growth and properties of Si-N-C-0 nanocones and graphitic nanofibers synthesized using three-nanometer diameter iron/platinum nanoparticle-catalyst
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Growth and properties of Si-N-C-0 nanocones and graphitic nanofibers synthesized using three-nanometer diameter iron/platinum nanoparticle-catalyst

机译：用三纳米直径铁/铂纳米粒子催化剂合成的Si-N-C-0纳米锥和石墨纳米纤维的生长和性能

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摘要

Cone-shaped nanostructures of mixed composition (nanocones) and largely graphitic nanofibers were synthesized on silicon substrates using iron/platinum alloy nanoparticles as the catalyst in a direct-current plasma enhanced chemical vapor deposition reactor. The catalyst nanoparticles were monodisperse in size with an average diameter of 3 (+-1) nm. The nanocones were produced on laterally widely dispersed catalyst particles and were oriented perpendicular to the substrate surface with an amorphous internal structure. The nanocones were produced by gas phase mixing and deposition of plasma-sputtered silicon, nitrogen, carbon, and oxygen species on a central backbone nucleated by the Fe-Pt catalyst particle. Field emission measurements showed that a very high turn-on electric field was required for electron emission from the nanocones. In contrast, the graphitic nanofibers that were produced when silicon sputtering and redeposition were minimized had the "stacked-cup" structure, and well-defined voids could be observed within nanofibers nucleated from larger catalyst particles.
机译：在直流等离子体增强化学气相沉积反应器中，使用铁/铂合金纳米粒子作为催化剂，在硅基板上合成了混合成分（纳米酮）和大部分石墨纳米纤维的圆锥形纳米结构。催化剂纳米粒子的尺寸为单分散，平均直径为3（+1）nm。纳米锥在横向分散的催化剂颗粒上产生，并垂直定向于具有非晶内部结构的基材表面。通过气相混合并在由Fe-Pt催化剂颗粒成核的中心骨架上沉积等离子溅射的硅，氮，碳和氧物种来生产纳米锥。场发射测量表明，纳米锥的电子发射需要很高的开启电场。相反，当最小化硅溅射和再沉积时产生的石墨纳米纤维具有“叠杯”结构，并且在较大催化剂颗粒成核的纳米纤维中可以观察到明确定义的空隙。

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  • 来源
    《Journal of Materials Research》 |2005年第4期|p.850-855|共6页
  • 作者

    H. Cui; X. Yang; H.M. Meyer;

  • 作者单位

    Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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