Accession Number:

ADA316044

Title:

Effective Medium Theory Characterization of Au/Ag Nanoalloy-Porous Alumina Composites.

Descriptive Note:

Interim rept.,

Corporate Author:

COLORADO STATE UNIV FORT COLLINS DEPT OF ANIMAL SCIENCE

Report Date:

1996-09-30

Pagination or Media Count:

9.0

Abstract:

The optical constants n sub Al and k sub Al of a 5050 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-alloyinsulator composite the volume fraction of the nano-alloy was equal to 5. The absorption maximum lambda max 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. lambda max in the range 512 to 519 nm Au Ag alloy between 6040-7030 volume fraction respectively is needed to obtain the scarlet-red exhibited by the famous Lycurgus cup of 4th century Rome.

Subject Categories:

  • Properties of Metals and Alloys
  • Inorganic Chemistry
  • Physical Chemistry
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE