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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 期刊論文 >  Field emission from the composite structure of vertical single-walled carbon nanotubes/ carbon nanocones

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/55357

    Title: Field emission from the composite structure of vertical single-walled carbon nanotubes/ carbon nanocones
    Authors: CMYeh;M Y Chen;Jhwang;J-Ygan;C S Kou
    教師: 寇崇善
    Date: 2006
    Publisher: Institute of Physics
    Relation: Nanotechnology, Institute of Physics, Volume 17, Issue 24, 2006, Pages 5930
    Keywords: VA-SWCNTs
    Field emission
    Abstract: Vertically aligned single-walled carbon nanotubes (VA-SWCNTs) have been
    fabricated on carbon nanocones (CNCs) in a gravity-assisted chemical
    vapour deposition (CVD) process. The CNCs with nanoscale Co particles at
    the top were first grown on the Co/Si(100) substrate biased at 350 V in a
    plasma enhanced chemical vapour deposition process. The CNCs typically
    are ∼200 nm in height, and their diameters are ∼100 nm near the bottom and
    ∼10 nm at the top. The nanoscale Co particles ∼10 nm in diameter act as
    catalysts which favour the growth of VA-SWCNTs out of CNCs at 850 ◦C in
    the gravity-assisted CVD process. The average length and the growth time of
    VA-SWCNTs are ∼150 nm and 1.5 min, equivalent to a growth rate of
    ∼6 μm h−1. The diameters of VA-SWCNTs are estimated to be 1.2–2.1 nm.
    When VA-SWCNTs are fabricated on CNCs, the turn-on voltage is reduced
    from 3.9 to 0.7 V μm−1 and the emission current density at the electric field
    of 5 V μm−1 is enhanced by a factor of more than 200. The composite
    VA-SWCNT/CNC structure is potentially an excellent field emitter. The
    emission stability of the VA-SWCNT/CNC field emitter is discussed.
    URI: http://www.iop.org/
    Appears in Collections:[物理系] 期刊論文

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