Fabrication of hollow metal "nanocaps" and their red-shifted optical absorption spectra

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Journal Article
Advanced Materials, 2005, 17 (10), pp. 1276 - 1281
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The optical and infrared radiation (IR) absorption spectra of randomly oriented suspensions of discrete cap-shaped metal nanoparticles were discussed. Nanocaps of gold, silver, aluminum, copper, and chromium were produced and the effect of variations in deposition angle and thickness were analyzed. The nanocaps were fabricated with the application of 200 nm diameter PSPs onto a glass substrates by spin-coating. The results show that the absorption peaks of these nanocaps are strongly red shifted relative to those of solid nanospheres.
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