Enhancement of electron emission efficiency of Mo tips by diamondlike carbon coatings

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Abstract
The effect of diamondlike carbon (DLC) films coated by pulsed laser deposition technique on the electron emissioncharacteristics of Mo tips is examined. Turn‐on voltage (V 0) was lowered from 40 V for Mo tips to 22 V for DLC coated Mo tips and maximum anode current (I A ) was increased from ∼44 μA for Mo tips to ∼2.0 mA for DLC coated Mo tips. Maximum anode current (I A ) for the DLC coated Mo tips, however, decreased during operation. Raman spectroscopy and selected area diffraction(SAD) in transmission electron microscopy(TEM) revealed that the degradation of electron emission behavior can be ascribed to the conversion of sp 3‐bonds, characteristic for diamond, to sp 2‐bonds, characteristics for graphite. The transformation of the structure is assumed to be induced by the local heat from the DLC coatings.

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