Abstract
Graphite nanoplatelet (GNP) paste field emitters fabricated using all-carbon-based materials, such as GNPs, graphite nanoparticles, graphite binders, and a graphite rod substrate have been demonstrated. The GNP field emitters on the graphite rod substrate showed an emission current density of 84.3 mA/cm2 and good emission stability with a degradation rate of less than 10%, indicating higher emission performance than other GNP field emitters. The enhanced field emission performance of the GNP field emitter is attributed to a low work function barrier between carbon materials, low contact resistance between GNPs and the graphite rod substrate, and good GNP paste bulk electrical conductivity. The new approach to fabricate GNP field emitters using all-carbon-based materials can be useful for various field emission devices.
Highlights
We investigated the field emission properties of a Graphite nanoplatelet (GNP) field emitter made of all-carbon-based materials, such as the turn-on electric field, maximum emission current, and long-term emission stability
Our approach to fabricate GNP field emitters using all-carbonbased materials may be very helpful in minimizing the work function barrier between carbon materials, inducing good bulk electrical conductivity of the GNP paste and a low contact resistance between the GNP paste and the graphite rod substrate
We consider that the low contact resistance between the GNP paste and the graphite rod substrate and the good bulk electrical conductivity of the GNP paste leads to enhanced field emission properties
Summary
We investigated the field emission properties of a GNP field emitter made of all-carbon-based materials, such as the turn-on electric field, maximum emission current, and long-term emission stability. The GNP field emitters demonstrated the best field emission properties at a gap distance of 2000 μm, such as a threshold electric field of 3.5 V/μm and a maximum emission current of 84.3 mA/cm2.
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