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Surface properties and work function changes induced by atomic oxygen adsorbed on HfC(111) surface

机译:HfC(111)表面吸附的原子氧诱导的表面性质和功函数变化

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摘要

Hafnium carbide (HfC) is regarded as one of the most promising cathode materials for field emission. But the experimental results did not provide a detail picture of the surface properties. In this work, we perform an ab initio study of the surface energies and work functions for the (1 0 0), (1 1 0), (1 1 1), (2 1 0), (3 1 0) and (3 1 1) surfaces of hafnium carbide. For the polar surface of (1 1 1) and (3 1 1) plane, a new method is taken to calculate the surface energy of the different surface terminations. The results indicate that the Hf termination surface is most stable, which are consistent with the experimental results. Additionally, we focused in particular on oxygen atom induced work function changes on HfC (1 1 1) plane as a function of coverage. An unexpected decrease of the work function is found at low coverage, and a reasonable resolution for this anomaly is given based on the method of Roman et al. (C) 2015 Elsevier B.V. All rights reserved.
机译:碳化(HfC)被认为是用于场发射的最有希望的阴极材料之一。但是实验结果并未提供表面特性的详细图片。在这项工作中,我们从头开始研究表面能和(1 0 0),(1 1 0),(1 1 1),(2 1 0),(3 1 0)和( 3 1 1)碳化ha的表面。对于(1 1 1)和(3 1 1)平面的极性表面,采用了一种新方法来计算不同表面终端的表面能。结果表明,Hf终止表面最稳定,与实验结果一致。此外,我们特别关注氧原子在HfC(1 1 1)平面上引起的功函数随覆盖率的变化。在低覆盖率下发现功函数意外降低,并根据Roman等人的方法给出了解决该异常现象的合理方法。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Applied Surface Science》 |2015年第1期|1046-1052|共7页
  • 作者

    Wang Jian; Wang Shao-qing;

  • 作者单位

    Univ Sci & Technol China, Sch Chem & Mat Sci, Hefei 230026, Peoples R China|Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China|Univ Sci & Technol Liaoning, Coll Sci, Anshan 114051, Liaoning Provin, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Surface energy; Work function; Field emission; First principles; Dipole moment;

    机译:表面能;功函数;场发射;第一性原理;偶极矩;

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