Abstract
Field emission characteristics from multiwall carbon nanotubes were studied under various gas environments. The experiments on field emission revealed several surface reactions under high-vacuum operating conditions. The Fowler–Nordheim (F–N) analysis showed a field emission regime dominated by the surface adsorbents, operational modes, and nanotube types. The emission-assisted surface reaction process, which enhances the gas adsorptions in low current regimes and desorption under high currents, plays a key role for the observed deviation from the F–N results. Different gas exposures suggested that the nanotube-H2O and nanotube-H2 reactions cause the current increase in the low emission range.
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