Abstract
A thermal evaporation method in high vacuum has been developed to synthesize NPB nanostructures. The morphology, structure and cycle-testing of field emission behavior have been investigated. The field emission characteristics exhibit low turn-on field 6.25, 7.5 and 6.2 V/mu m and maximum current density can reach 1.65, 2.4 and 2.0 mA/cm(2) for nominal thicknesses of 5, 10 and 20 nm, respectively. An obvious hysteresis for current density in the cycle testing with continuous rising and falling electric field is observed in the case of the considered samples, which can be attributed to microstructure and adsorption/desorption effect. Amorphous NPB nanostructures with good and stability field emission properties are promising candidates for application as field emitters.
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