Sol-gel preparation of AuCu and Au4Cu nanocluster alloys in silica thin films
Article Abstract:
Metal alloy nanoclusters of AuCu and Au4CCu in SiO2 thin films were synthesized using sol-gel processing and high-temperature annealing. Crystallographic data showed that the lattice parameters of the nanocluster alloys, both showing the fcc structure, are very close to bulk values. The nanocrystals obtained by annealing at 900 degrees Celsius were nearly spherical in shape. The peaks of the optical spectra of the samples annealed at 700-900 degrees Celsius are located at 555 nm for AuCu and 562 nm for Au4Cu.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Alloying in CuPd nanoparticle catalysts
Article Abstract:
Research was conducted to examine alloying in Cu/Pd nanoparticle catalysts. A new application of the atomic layer epitaxy technique was used to prepare binary alloy nanoparticle catalysts on various supports. It was also employed in the preparation of Cu/Pd bimetallic catalysts on SiO2 and on gamma-al2O3. Transmission electron microscopy and extended x-ray absorption fine structure measurements were used to characterize the samples. Results reveal that particle sizes are in the range 20-60 angstrom.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Alloy formation of gold-silver nanoparticles and the dependence of the plasmon absorption on their composition
Article Abstract:
The plasmon absorption of gold-silver alloy nanoparticles are studied. The nanoparticles were prepared via the co-reduction of chloroauric acid HAuCl4 and silver nitrate AgNO3 with sodium citrate in aqueous solution. Optical absorption spectra show a single plasmon absorption, indicating that mixing gold and silver results in a homogenous formation of alloy nanoparticles. The maximum of the plasmon band also blue-shifts linearly with increasing silver content.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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