Influences of the surface reactions on the field emission from multiwall carbon nanotubes

Dong, Changkun; Gupta, Mool C.
July 2003
Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p159
Academic Journal
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-H[SUB2]O and nanotube-H[SUB2] reactions cause the current increase in the low emission range.


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