Hierarchical WSe2 Nanoflowers for Efficient Field Emission

This report is on the field emission properties of WSe2 nanoflowerssynthesized via a solution-phase colloidal approach, uniformly deposited onSi/SiO2 substrates. Structural and spectroscopic data confirm the formationof highly crystalline nanoflowers with predominantly 1T′ phase content andminimal surface oxidation. Field emission measurements, performed invacuum using a nanomanipulated tungsten probe, reveal a low turn-onvoltage and a field enhancement factor ranging from ≈70 at cathode-anodeseparation distance of 100 nm, to ≈10 for distance increased to 900 nm, asresulting by the analysis in the framework of the Fowler–Nordheim model.WSe2 nanoflowers offer competitive performance combined with excellentstability, attributable to their hierarchical architecture and metallic character.These results demonstrate the potential of WSe2 nanoflowers as efficient coldcathode materials for next-generation vacuum electronic applications.