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Issue 66, 2015
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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

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Publication details

The article was received on 09 May 2015, accepted on 09 Jun 2015 and first published on 09 Jun 2015


Article type: Paper
DOI: 10.1039/C5RA08633G
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2015,5, 53604-53610
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    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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