Enhancement of electron emission and long-term stability of tip-type carbon nanotube field emitters via lithium coating
- Authors
- Kim, Jong-Pil; Chang, Han-Beet; Kim, Bu-Jong; Park, Jin-Seok
- Issue Date
- Jan-2013
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Carbon nanotubes; Electrophoretic deposition; Electroplating; Li coating; Field emission properties; Tip-type field emitters; Cold cathode for X-ray tubes
- Citation
- THIN SOLID FILMS, v.528, pp.242 - 246
- Indexed
- SCIE
SCOPUS
- Journal Title
- THIN SOLID FILMS
- Volume
- 528
- Start Page
- 242
- End Page
- 246
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/28900
- DOI
- 10.1016/j.tsf.2012.08.060
- ISSN
- 0040-6090
- Abstract
- Carbon nanotubes (CNTs) were deposited on conical tip-type substrates via electrophoresis and coated with lithium( Li) thin films with diverse thicknesses via electroplating. For the as-deposited (i.e., without Li coating) CNT, the turn-on (or triggering) electric field was 0.92 V/mu m, and the emission current, which was generated at an applied field of 1.2 V/mu m was 56 mu A. In the case of the 4.7 nm-thick Li-coated CNT, the turn-on field decreased to 0.65 V/mu m and the emission current at the same applied field increased more than ten times to 618 mu A. The analysis based on the Kelvin probe measurement and Fowler-Nordheim theory indicated that the coating of Li caused a loss in the structural-aspect-ratio of the CNTs and it reduced their effective work functions from 5.36 eV to 4.90 eV, which led to a great improvement of their electron emission characteristics. The results obtained in this study also showed that the long-term emission stability could be enhanced by the coating of thin Li films on CNTs. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.
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