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J Colloid Interface Sci. 1998 Dec 1;208(1):272-278.

Dodecanethiol-Derivatized Au/Ag Bimetallic Nanoparticles: TEM, UV/VIS, XPS, and FTIR Analysis.

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1
Department of Chemistry and Center for Molecular Catalysis, Seoul National University, Seoul, 151-742, Korea

Abstract

Dodecanethiol-derivatized Au/Ag bimetallic nanoparticles that can be dissolved in nonpolar solvents were prepared via a two-phase synthetic route in water/toluene mixtures. The position of the surface plasmon band was found to vary linearly between 419 and 522 nm as a function of mole fraction of Au (or Ag) content, implying ready formation of Au-Ag alloy clusters. Transmission electron microscopy images revealed that the bimetallic clusters were monodisperse with an average size of approximately 4 nm. Infrared spectral features indicate that the alkyl chains of the dodecanethiolate species take fully extended trans zigzag conformations on all alloy clusters. The most interesting finding deduced from X-ray photoelectron spectroscopy and FTIR spectroscopic measurements was that Ag atoms are enriched at the outer part of the alloy clusters when compared with the Au atoms.

PMID:
9820774
DOI:
10.1006/jcis.1998.5812

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