Abstract
In this work, pulsed laser annealing (PLA) was preformed on ion-beam-synthesized Ag-SiO2 nanocomposites to improve the FE properties of these samples by modifying the size and distribution of the Ag nanoclusters. The PLA was preformed using a 248 nm KrF excimer laser. Multiple pulses, with durations of 25 ns, at an energy density of 250 mJ/cm were accumulated onto the sample. The FE properties of the samples were studied in a high vacuum chamber, with a base pressure better than 5x10-4 Pa. The current-electric field (I-F) characteristics were measured using a sphere-to-plane electrode configuration, with a 5 mm diameter stainless-steel ball anode. The applied electric field was obtained by dividing the applied voltage by the gap distance and the threshold field (Fth) and is defined as the field strength when an emission current of 1 nA is achieved. The microstructure and the surface morphology of these samples are determined by the cross-section transmission electron microscopy (XTEM) and atomic force microscopy (AFM) measurements, respectively.
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