Single-crystalline lanthanum hexaboride (LaB6) nanowires show excellent electric-field-induced electron emission following the Fowler–Nordheim scheme. The LaB6 nanowires grow in the <001> crystallographic direction (see Figure) with diameters of about 20 nm. An emission current of 30 nA from a single nanowire, corresponding to a emission current density of 5 × 105 A cm–2, has been obtained.
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Zhang et al. (2005) studied this question.
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