Fig. 8
From: Subwavelength core/shell cylindrical nanostructures for novel plasmonic and metamaterial devices
(a–g are adapted from [63])
Conformal and uniform deposition of various materials on high-aspect-ratio silicon micro/nanowires for coaxial/multilayered cylindrical architectures. a Top-down fabricated Si wire array homogeneously decorated with Ni nanoparticles. b High-aspect-ratio Si NWs covered with a thin Ni layer. c Low- and high-resolution STEM images for detailed characterization of a uniformly deposited Ni film on a Si wire. d Schematic illustration of tip-exposure of core/shell wires (left) and SEM images of tip-exposed core/shell Si/Ni (middle) and Si/polypyrrole (right) wires. e Schematic illustration of multilayer uniform deposition for core/shell wires (left) and SEM images of Si/Ni/Au/Ni/Au (middle) and Si/cavity/Au/cavity/Au (right) wires. f Schematic illustration of a Si/Ni/Au core/shell NW (top), STEM image of the fabricated wire (bottom, left) and corresponding elemental mapping images of the above wire. g Deposition of different materials on Si wires: (i) rhodium, (ii) polyaniline, (iii) cadmium selenide, (iv) Ni/polyaniline shell, (v) Ni/Ru shell