Field emission current limits of patches with cylindrical gold nanowires
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چکیده
Based on the field emission (FE) results achieved with regular test arrays of gold [1] and platinum [2] nanowire (NW) patches, FE cathodes (Ø 5 mm) with a triangular patch array (Ø 150 μm, pitch 320 μm) of cylindrical AuNW (10 cm, Ø 200 nm, length 12 μm) were fabricated by means of a shadow mask during heavy ion irradiation of polycarbonate foils. The emitter distribution and local properties of such cathodes were measured with the field emission scanning microscope (FESM). Well-aligned FE from all patches was obtained at fields below 25 V/μm as shown in Fig. 1a which reveals typically 4-8 emitters per patch. This result confirms our strategy of emitter redundancy for improved FE homogeneity of NW cathodes.
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تاریخ انتشار 2010