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Issue 66, 2015

Effect of the reduction process on the field emission performance of reduced graphene oxide cathodes

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Abstract

The electron field emission (FE) properties of reduced graphene oxide (rGO) cathodes produced by three different reduction methods were assessed and compared. In particular, chemical reduction techniques, using either NaOH or KOH as reducing agents, were compared with thermal reduction (TR) methods. X-ray photoelectron spectroscopy (XPS) measurements revealed that different reduction techniques led to different GO lattice parameters. Furthermore, the work function measured with ultraviolet photoelectron spectroscopy (UPS) varied among the samples giving rise to different electron emission characteristics. In particular, the cathodes prepared by the TR method presented the best FE performance, showing a turn-on field of as low as ∼1.8 V μm−1 and a field enhancement factor of ∼1300, which was very close however to that shown by the NaOH-reduced sheets. The worst FE properties were exhibited by the KOH-reduced nanosheets. In light of the above results, the role of the different reduction techniques as well as the final rGO lattice characteristics with regards to the emission performance are evaluated and discussed.

Graphical abstract: Effect of the reduction process on the field emission performance of reduced graphene oxide cathodes

Article information


Submitted
09 May 2015
Accepted
09 Jun 2015
First published
09 Jun 2015

RSC Adv., 2015,5, 53604-53610
Article type
Paper
Author version available

Effect of the reduction process on the field emission performance of reduced graphene oxide cathodes

L. Sygellou, G. Viskadouros, C. Petridis, E. Kymakis, C. Galiotis, D. Tasis and E. Stratakis, RSC Adv., 2015, 5, 53604 DOI: 10.1039/C5RA08633G

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