When a water droplet spreads on a vertically aligned nanorod surface, the nanorod array will deform into statistically percolated patterns. This nanocarpet effect has been investigated for Si nanorods. Three distinct morphologies were found: a center region due to the water droplet impact, a tilting region due to gravity, and a percolation region due to capillary invasion. The corresponding capillary forces have been estimated through finite element analysis. This effect presents a challenge for nanodevices involving liquid interactions.
Ag nanorod electrodes with different nanorod lengths are fabricated by a
simple vacuum deposition technique, oblique angle deposition (OAD). The
as-grown Ag nanorods are aligned on the substrate and have a diameter of
∼60–70 nm, a density
of ∼200–300 × 107 cm−2, and a
tilting angle of ∼70°–80°
with respect to the surface normal. The electrochemical behaviours of the Ag nanorod
electrode are characterized by cyclic voltammetry at various scan rates with comparison to
an Ag thin-film electrode. The capacitive current is found to be proportional to the actual
surface area, and the faradic redox current also increases monotonically with the surface
area of the nanorod electrodes, but the increase is not as significant as that of the
capacitive current due to the diffusion layer overlapping for the highly compacted
nanorods. This indicates that the Ag nanorod electrode could improve the electrolytic
sensor for amperometric response measurements, especially for the bimolecular
measurements due to the biocompatibility of Ag. The high capacitance also suggests a
promising usage of the developed nanostructures for battery and energy storage
applications.
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