Fig. 1.

Field emission SEM images of nanowires and corresponding nanodisk arrays. (A) Identical 120- ± 10-nm Au disks with 30- ± 5-nm Ni separations. (B) Au disk with identical 30- ± 5-nm Ni separations and thicknesses of 40 ± 5, 80 ± 8, 120 ± 10, and 200 ± 15 nm from top left to bottom right. At the top left is a single Au disk (thickness = 40 nm). (C) Identical 120- ± 10-nm Au disks with Ni segments of 160 ± 10, 80 ± 10, 30 ± 5, 15 ± 5, and 5 ± 2 nm from bottom left to top right. (D–F) SEM images of the gapped nanowire structures after performing the OWL process on A (D) B (E), and C (F). Separations between groups of Au nanodisks are ≈1 μm in all nanowires.