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Effective medium theory characterization of Au/Ag nanoalloy-porous alumina composites
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1997 (English)In: Nanostructured materials, ISSN 0965-9773, E-ISSN 1872-9150, Vol. 9, no 1-8, 571-574 p.Article in journal (Refereed) Published
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Abstract [en]

The optical constants nAl and kAl of a 50/50 volume fraction Au/Ag alloy were derived synthetically by application of a Bruggeman (BG) effective medium expression. The alloy data base was then input into a Maxwell-Garnett (MG) effective medium expression to determine the absorption maximum of the nano- alloy/insulator composite (the volume fraction of the nano-alloy was equal to 5%). The absorption maximum (λmax) of the hypothetical composite was found to be 499 nm for spherical particles and was blue-shifted relative to that of a composite containing pure gold nanospheres (499 vs. 528 nm respectively). The transmission color at this wavelength was a red-orange. λmax in the range 512 to 519 nm (Au/Ag alloy between 60/40 - 70/30 volume fraction respectively) is needed to obtain the scarlet-red exhibited by the famous Lycurgus cup of 4th century Rome (1). © 1997 Acta Metallurgica Inc.

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1997. Vol. 9, no 1-8, 571-574 p.
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Nano Technology
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URN: urn:nbn:se:kth:diva-182941Scopus ID: 2-s2.0-0345847899OAI: oai:DiVA.org:kth-182941DiVA: diva2:918280
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NR 20160422

Available from: 2016-04-11 Created: 2016-02-24 Last updated: 2016-04-22Bibliographically approved

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