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A High-Luminescence Fringelike Field Emission from Screen-Printed Carbon Nanotube and Zinc Oxide Composite Film

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Author(s): Shiguang Shang | Ling Zhao | Weihua Liu | Ping Zhao | Xin Li

Journal: Journal of Electromagnetic Analysis and Applications
ISSN 1942-0730

Volume: 02;
Issue: 12;
Start page: 649;
Date: 2010;
Original page

Keywords: Carbon Nanotube | Fringelike Field Emission | Film Cathode

ABSTRACT
A fringelike field emission with high-luminescence and stable emission current from screen-printed carbon nanotube mixed zinc oxide (CNT-ZnO) composite cathode was investigated. The luminescent patterns are significantly different from those observed in the field emission measure of pure CNT cathode. SEM images reveal that the CNTs are perfectly matched with ZnO powders by filling the interspaces in CNT film. XRD analysis demonstrates that the CNTs and ZnO have a high degree of crystalline perfection. Field emission measurement exhibits that the turn-on field of CNT-ZnO cathode is 2.08 V/µm, lower than 2.46 V/µm for pure CNT cathode. The large fringelike emission current at the brims of CNT-ZnO cathode is attributed to a combination of the increased effective contact area of CNTs, which decrease the sheet resistance of cathode film, and the dangled CNT bundles at the brims of CNT-ZnO film cathode.
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