Applied Physics Letters · 1996 · 102 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials ChemistrySurface ChemistrySurface ScienceAnode MaterialsCarbon NanomaterialsElectronic Material CharacterizationSemiconductor Device MaterialsSemiconductor SurfacesSurface PhysicsAnode PerformanceCarbon CoatingsCarbon MaterialsCarbon-based NanomaterialsHeatPulsed Laser DepositionPulsed Laser Deposition CoatingsSelected Area Electron Diffraction
The effect of diamondlike carbon (DLC) films coated by pulsed laser deposition technique on the electron emission characteristics of Mo tips is examined. Turn-on voltage (V0) was lowered from 40 V for Mo tips to 22 V for DLC coated Mo tips and maximum anode current (IA) was increased from ∼44 μA for Mo tips to ∼2.0 mA for DLC coated Mo tips. Maximum anode current (IA) 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 sp3-bonds, characteristic for diamond, to sp2-bonds, characteristics for graphite. The transformation of the structure is assumed to be induced by the local heat from the DLC coatings.