Abstract
The electron field emission properties of graphene/double-walled carbon nanotube (DWCNT) composite films prepared by screen printing have been systematically studied. Comparing with the pure DWCNT films and pure graphene films, a significant enhancement of electron emission performance of the composite films are observed, such as lower turn-on field, higher emission current density, higher field enhancement factor, and long-term stability. The optimized composite films with 20% weight ratio of graphene show the best electron emission performance with a low turn-on field of 0.62 V μm -1 (at 1 μA cm-2) and a high field enhancement factor β of 13,000. A model of the graphene/DWCNT composite films is proposed, which indicate that a certain amount of graphene will contribute the electron transmission in the silver substrate/composite films interface and in the interior of composite films, and finally improve the electron emission performance of the graphene/DWCNT composite films.
| Original language | English |
|---|---|
| Pages (from-to) | 348-351 |
| Number of pages | 4 |
| Journal | Journal of Alloys and Compounds |
| Volume | 551 |
| DOIs | |
| State | Published - 25 Feb 2013 |
Keywords
- Double-walled carbon nanotube
- Field emission
- Graphene
- Screen printing
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