Difference between revisions of "Fabrication and Wetting Properties of Metallic Half-Shells with Sub-Micron Diameters"

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== Fabrication of Half-Shells ==
 
== Fabrication of Half-Shells ==
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[[Image:Love-fabricating_metallic_halfshells.jpg|200px|thumb|right|Love, J.C., et al. Nanoletters. 2002 10.1021/nl025633l]]
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As illustrated in the figure at right, fabrication of the half-shells occurs in four main steps:
 
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
 
:- monolayers or multilayer of silica colloids are prepared by drop-casting aqueous suspensions of the particles onto glass slides
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:- spherical colloids are released from the glass slide by sonication
 
:- 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
 
:- silica and adhesion metal are dissolved by etching the colloids in hydrofluoric acid (HF), leaving only the thin shell
 
[[Image:Love-fabricating_metallic_halfshells.jpg|200px|thumb|right|Love, J.C., et al. Nanoletters. 2002 10.1021/nl025633l]]
 

Revision as of 04:37, 9 February 2009

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