Effective large-area free-standing graphene field emitters by electrophoretic deposition

Large area graphene field emitters were fabricated using electrophoretic deposition. By varying the deposition time, we were able to fabricate emitters with varied field enhancement factors. The turn-on field increased when the deposition time increased, and it was observed that a monolayer of graph...

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Bibliographic Details
Published in:Applied physics letters 2012-10, Vol.101 (18)
Main Authors: Koh, Angel T. T., Foong, Y. M., Pan, Likun, Sun, Zhuo, Chua, Daniel H. C.
Format: Article
Language:English
Subjects:
Deposition
Electrophoretic deposition
Emission
Emitters
Flakes
Graphene
Orientation
Spots
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Summary:Large area graphene field emitters were fabricated using electrophoretic deposition. By varying the deposition time, we were able to fabricate emitters with varied field enhancement factors. The turn-on field increased when the deposition time increased, and it was observed that a monolayer of graphene flakes covered on the substrate gave the best results. The low emission turn-on field obtained from the graphene field emitters was attributed to the random orientation of graphene flakes which give protruded edges that acted as field enhancing spots. Graphene emitters produced by this method present a low cost cold cathode that can be mass produced.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4765070