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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/91625

    Title: Growth behavior of nanocrystalline diamond films on ultrananocrystalline diamond nuclei: The transmission electron microscopy studies
    Authors: Wang, Chuan-Sheng;Chen, Huang-Chin;Cheng, Hsiu-Fung;Lin, I-Nan
    Contributors: 淡江大學物理學系
    Date: 2009
    Issue Date: 2013-07-22 10:00:57 (UTC+8)
    Publisher: College Park: American Institute of Physics
    Abstract: Micron-crystalline diamond (MCD) films with a unique microstructure were synthesized using a modified nucleation and growth process, in which a thin layer of ultrananocrystalline diamond (UNCD) was used as nucleation layer for growing diamond films in H2-plasma. Thus obtained (MCD)UNCD diamond films consist of nanosized diamond clusters ( ∼ 10 nm in size) surrounding the large diamond grains ( ∼ 300 nm in size), exhibiting better electron field emission (EFE) properties than the conventional diamond materials with faceted grains. The EFE of these (MCD)UNCD films can be turned on at E0 = 11.1 V/μm, achieving EFE current density as large as (Je) = 0.7 mA/cm2 at 25 V/μm applied field, which can be attributed to the presence of large proportion of UNCD grains lying in between the MCD grains, forming an electron conduction path and thus facilitating the EFE process. Transmission electron microscopy examinations reveal that such a unique microstructure was formed by agglomeration and coalescence of the nanosized UNCD grains.
    Relation: Journal of Applied Physics 105(12), 124311(7pages)
    DOI: 10.1063/1.3153957
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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