Flexible Field Emission from Thermally Welded Chemically Doped Graphene Thin Films

Flexible field‐emission devices (FEDs) based on reduced graphene oxide (RGO) emitters are fabricated by the thermal welding of RGO thin films onto a polymeric substrate. The RGO edges are vertically aligned relative to the substrate as a result of cohesive failure in the RGO layer after thermal weld...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2012-01, Vol.8 (2), p.272-280
Main Authors: Jeong, Hee Jin, Jeong, Hae Deuk, Kim, Ho Young, Kim, Sung Hun, Kim, Jun Suk, Jeong, Seung Yol, Han, Joong Tark, Lee, Geon-Woong
Format: Article
Language:English
Subjects:
doping
field emission
flexible devices
graphene
Nanotechnology
Thin films
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Summary:Flexible field‐emission devices (FEDs) based on reduced graphene oxide (RGO) emitters are fabricated by the thermal welding of RGO thin films onto a polymeric substrate. The RGO edges are vertically aligned relative to the substrate as a result of cohesive failure in the RGO layer after thermal welding. Even at large bending angles, excellent electron emission properties, such as low turn‐on and threshold fields, a high emission current density, a high field enhancement factor, and long‐term stability of the emission properties of RGO emitters, arise from the uniform distribution and high density of the extremely sharp RGO edges, as well as the high interfacial strength between the RGO emitters and the substrate. Al‐ and Au‐doped RGO emitters are fabricated by introducing a dopant solution to the RGO emitters, and the resulting field‐emission characteristics are discussed. The proposed approach is straightforward and enables the practical use of high‐performance RGO flexible FEDs. High‐performance flexible field‐emission devices employing strong reduced graphene oxide (RGO) emitters are fabricated by a simple thermal welding process followed by cohesive failure of the RGO thin film on the polymeric substrate. Chemical doping with n‐ and p‐type dopants is a reliable and convenient method for modifying the work function and field‐emission characteristics of the RGO emitters.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201101696