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The authors report the effects of Cs doping on the field emission properties of a five-shell single carbon nanotube. The chiral indices of each shell of this carbon nanotube have been determined using nanobeam electron diffraction, which has four semiconducting shells and one metallic shell in the middle. From the Fowler-Nordheim plots, a reduction from 4.8to3.8eV has been observed in the work function of the single carbon nanotube before and after Cs doping.

Field emission of electrons from a Cs-doped single carbon nanotube of known chiral indices