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    题名: Low temperature growth of ultrananocrystalline diamond film and its field emission properties
    作者: Pradhan, D.;Lee, Y. C.;Pao, C. W.;彭維鋒;Pong, Way-faung;Lin, I. N.
    贡献者: 淡江大學物理學系
    关键词: Diamond properties and applications;Nanocrystalline diamond;Field emission
    日期: 2006-11-01
    上传时间: 2009-12-31 10:10:44 (UTC+8)
    出版者: Elsevier
    摘要: Ultrananocrystalline diamond (UNCD) film is deposited at a substrate temperature lower than 500 °C. This film possesses diamond crystal of nanometer size embedded in a graphitic (or non-diamond carbon) phase. The presence of non-diamond carbon in the grain boundaries of diamond crystal plays a crucial role to the film properties and its corresponding application such as electron field emission. The present work reports the growth of UNCD films at different methane concentrations to alter the film properties that could make it suitable for higher electron field emission. The surface morphology of an as-grown film was examined with a field emission scanning electron microscope. Nucleation density in the range of 1011–1012/cm2 is obtained in the as-grown films. The grain size of diamond increases from 5 nm to 25 nm with an increase in CH4 concentration from 1% to 7.5% in the argon plasma. The presence of different carbon phases in the diamond films was investigated qualitatively by Raman studies. Near edge X-ray fine structure study ascertains that the as-grown films mainly possess diamond phase. A direct correlation of field emission properties with the CH4 concentration during UNCD growth is obtained.
    關聯: Diamond and Related Materials 15(11-12), pp.2001-2005
    DOI: doi:10.1016/j.diamond.2006.07.026
    显示于类别:[物理學系暨研究所] 期刊論文

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