Electron field emission from carbon nanotubes and undoped nanodiamond

S. G. Wang, Qing Zhang, S. F. Yoon, J. Ahn, D. J. Yang, Q. Wang, Q. Zhou, Jingqi Li

    Research output: Contribution to journalArticlepeer-review

    44 Scopus citations


    In this paper, the electron field emission characteristics of carbon nanotubes (CNTs) and undoped nano-diamond film have been investigated and compared by measuring the electron field emission I-V curve, the emission site density and the emission stability. The CNTs and undoped nano-diamond film were grown in the same microwave plasma enhanced chemical vapor deposition reactor using CH4/H2 and CH4/Ar mixtures, respectively. The morphologies and structures of CNTs and nano-diamond were characterized using field emission scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The field emission results show that CNTs exhibit a lower threshold electric field of 1.3 V/μm and a much higher emission current density of 1620 μA/cm2 at 2.72 V/μm compared to nano-diamond, which exhibits 3.8 V/μm and 540 μA/cm2 at 6.65 V/μm, respectively. However, CNTs have slightly lower emission stability than the nano-diamond.

    Original languageEnglish (US)
    Pages (from-to)8-14
    Number of pages7
    JournalDiamond and Related Materials
    Issue number1
    StatePublished - Jan 1 2003


    • Carbon nanotubes
    • Electron field emission
    • MPECVD
    • Nano-diamond

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Chemistry(all)
    • Mechanical Engineering
    • Physics and Astronomy(all)
    • Materials Chemistry
    • Electrical and Electronic Engineering


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