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4. Optical properties of gold nanoparticles
4.1 Localized plasmon resonance and nanoparticle color
A solution of gold nanoparticles has a ruby-red color when the particle size is of the order of ten nanometers, a color quite different from the yellow we know when the gold is in ingot form. This change in color is the immediately visible sign of the confinement of the electromagnetic wave that describes light within NPs. This interaction between an electromagnetic wave and a nano-object is of great interest to physicists who want to understand and use these phenomena. In fact, this interest dates back to Michael Faraday, who in 1857 was the first to understand the relationship between the color of gold and the size of the NPs he had just synthesized (see §
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Optical properties of gold nanoparticles
Electronic properties of gold nanoparticles
Bibliography
Websites
Or-Nano, CNRS Research Group
World Gold Council, official website
Gold Bulletin, the Journal of Gold Science, Technology and Applications (free access)
Events
International congress entitled "Gold" dealing with scientific research and applications of gold. The congress is held every 3 years. Gold 2009 took place in July 2009 in Heidelberg (Germany). Announcement of the congress relayed on http://www.gold.org .
Directory
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The Or-Nano research group's website contains a directory of French researchers from public institutions working on gold nanoparticles. See http://www.or-nano.org .
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