Fabrication and Wetting Properties of Metallic Half-Shells with Sub-Micron Diameters

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Short Overview

This paper presents work from Love, et al. concerning fabrication of metallic shells. Thin metallic shells are deposited on and then released from spherical molds. Treated with self-assembled monolayers, aggregates of these shells can be made superhydrophobic. In addition to forming structures that affect the wetting properties of a surface, it is postulated that the thin, metal edges of the half-shells can provide strong enhancements in optical and magnetic fields.

Fabrication of Half-Shells

Love, J.C., et al. Nanoletters. 2002 10.1021/nl025633l

As illustrated in the figure at right, fabrication of the half-shells occurs in four main steps:

- monolayers or multilayer of silica colloids are prepared by drop-casting aqueous suspensions of the particles onto glass slides
- an adhesion layer of titanium or nickel followed by a thin film of gold, platinum, or palladium are deposited onto the colloids via electron-beam evaporation
- spherical colloids are released from the glass slide by sonication
- silica and adhesion metal are dissolved by etching the colloids in hydrofluoric acid (HF), leaving only the thin shell