Field emission from a Ca nanotip grown on a Mo<110> microtip

Xin Zhao; Outlaw, R. A.; Champion, R. L.; Wang, J. J.; Manos, D. M.; Holloway, B. C.
August 2004
Applied Physics Letters;8/23/2004, Vol. 85 Issue 8, p1415
Academic Journal
We have observed field emission with an energy distribution of 68 meV full width at half maximum (FWHM) from a thermally cleaned Mo<110> single tip. The emission spectra are taken with the emitting surface at 295 K, using a double-pass cylindrical mirror analyzer in ultrahigh vacuum. This narrow energy distribution is attributed to a nanotip spontaneously formed on the ∼75 nm radius Mo tip from in situ buildup by field-induced surface diffusion. Auger electron spectroscopy showed that residual surface Ca segregated from the bulk during thermal cleaning and is likely the source of mobile atoms that formed the nanotip. The emission spectra show a discernible doublet that is attributed to a variation in the localized density of states of the nanotip. Sub-Langmuir oxygen exposure of the Mo tip immediately increased the energy distribution to a FWHM of >1 eV.


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