Simulations of the dielectric constant of bonding materials and field emission properties of CNT cathodes |
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Authors: | Tae-Sik Kim Young-Je An Kwang Ho Kim Won-Sub Chung Young-Rae Cho |
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Affiliation: | (1) Div. of Materials Science and Engineering, Pusan National University, San 30, Jangjeon 2-dong, Geumjeong-gu, 609-735 Busan, Korea |
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Abstract: | The effect of the dielectric constant (k) of bonding materials in a screen-printed carbon nanotube (CNT) cathode on the field
enhancement factor was investigated for high-efficiency CNT cathodes using the ANSYS software. The values obtained by a simulation
study were compared to the experimental results obtained for screen-printed CNT cathodes. The field enhancement factor increased
as the dielectric constant decreased, reaching a maximum value at a dielectric constant of 1, the value for a vacuum. The
findings indicate that the larger sheet resistance of the bonding materials, after the firing process, can be attributed to
the larger emission current of the CNT cathode. From these results, it was concluded that the best bonding materials for screen-printed
CNT cathodes should have a low dielectric constant and a high sheet resistance. This finding can be used as criteria for selecting
bonding materials for use in CNT pastes for highly efficient CNT cathodes. |
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Keywords: | carbon nanotube field emission dielectric constant field enhancement factor simulation |
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