Improved field emission properties of MgO-nanoparticle-doped carbon nanotube films and their application in miniature vacuum gauges

Authors

  • Juan Su,

    1. Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, People's Republic of China
    Search for more papers by this author
  • Deng-Zhu Guo,

    Corresponding author
    1. Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, People's Republic of China
    • Phone: +86-10-62765112, Fax: +86-10-62765112
    Search for more papers by this author
  • Ying-Jie Xing,

    1. Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, People's Republic of China
    Search for more papers by this author
  • Geng-Min Zhang

    1. Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, People's Republic of China
    Search for more papers by this author

Abstract

Composite films of carbon nanotubes (CNTs) and MgO nanoparticles are fabricated on metal substrates as field emitters by a simple mechanical rubbing method. The field emission properties of the CNT films could be dramatically improved by mixing an optimum proportion (∼7 wt%) of MgO nanoparticles. It lowers the turn-on field to 1.3 V µm−1 and the threshold field to 2 V µm−1, and also increases the field emission stability and uniformity. Such CNTs–MgO films are applied as cathode in ionization vacuum gauges. The gauges, with the advantages of small size and low power consumption, exhibit good measurement linearity in vacuum pressure range from 8 × 10−6 to 2 × 10−2 Pa, and a sensitivity of 0.2 Pa−1.

Ancillary