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Browsing by Author "Juan, Chuan-Pin"

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    Properties of carbon nanotubes via a thin Ti capping layer on the pretreated catalyst
    (2007)
    Lai, Rui-Ling
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    Shiu, Jiun-Kai
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    Chang, Yao-Ren
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    Lin, Kao-Chao
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    Chang, Pei-Chi
    Screening effect and reliability are two of the most important issues in carbon nanotube-based field-emission devices. A thin Ti capping layer has been deposited on the hydrogen-pretreated catalytic iron nanoparticles to control the density of subsequently grown carbon nanotubes. In this way, the screening effect can be remarkably reduced due to the density of carbon nanotubes down to 10(7) from 10(9) cm(-2) as compared to the control specimens. Thus, the turn-on field can be improved to be 2.1 from 3.8 V/mu m at the emission current density of 10 mu A/cm(2). Furthermore, the electrical breakdown field can be increased to more than 7 V/mu m and the lifetime of carbon nanotubes at high electric field (10 V/mu m) can be greatly prolonged from a few seconds to more than 1 h. This can be attributed to better adhesion and lower contact resistance between the carbon nanotubes and the substrate. (c) 2007 The Electrochemical Society. All rights reserved.
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    The reliability improvements of carbon nanotubes emitters by utilizing an Fe-Ti codeposited catalyst
    (2007-08-01)
    Lai, Rui-Ling
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    Shiu, Jiun-Kai
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    Chang, Yao-Ren
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    Lin, Kao-Chao
    ;
    Chang, Pei-Chi
    In this report, carbon nanotubes (CNTs) partially immersed into the codeposited metal layer have been synthesized by utilizin- an Fe-Ti codeposited catalyst in a thermal -chemical vapor deposition system. This structure could enlarge the contact area between CNTs and substrates to provide better adhesion properties than that in the case of CNTs synthesized from a pure Fe film. Therefore, an abrupt decrease in emission current due to mechanical destruction at a high electric field and a gradual degradation in emission current due to Joule heating were remarkably suppressed. A stable emission current of about 30mA/cm(2) at 7.7 V/mu m for 2,500 s was obtained without obvious degradation.