EXAFS Studies of Bimetallic Ag-Pt and Ag-Pd Nanorods

Journal Article · Thu Oct 30 04:00:00 EDT 2008 · Phys. Scripta.

OSTI ID:1008531

Lahiri, D; Chattopadhyay, S; Bunker, B A; Doudna, C M; Bertino, M F; Blum, F; Tokuhiro, A; Terry, J ^[1]

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1. IIT

Nanoparticles of Ag-Pt and Ag-Pd with high aspect ratios were synthesized using a radiolysis method. Gamma rays at dose rates below 0.5 kGy/h were used for irradiation. The nanoparticles were characterized by transmission electron microscopy (TEM), optical absorption spectroscopy and x-ray Absorption Fine Structure (XAFS) spectroscopy. Bright field micrographs show that Ag-Pt nanowires are composed of large particles with diameters ranging from 20-30 nm and joined by filaments of diameter between 2-5 nm. The Ag-Pd nanowires have diameters of 20-25 nm and lengths of 1.5 {micro}m. For XAFS measurements, the Pt L3 edge (11.564 keV), Ag K-edge (25.514 keV) and Pd K-edge (24.350 keV) were excited to determine the local structure around the respective atoms in the cluster. The Ag-Pt particles were found to possess a distinct core-shell structure with Pt in the core surrounded by Ag shell, with no indication of alloy formation. However, nanorods of Ag-Pd have formed an alloy for all the alloy compositions.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1008531
• Journal Information: Phys. Scripta., Journal Name: Phys. Scripta. Journal Issue: 2005 Vol. T115; ISSN 0031-8949; ISSN PHSTBO
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTROSCOPY
ELECTRONIC STRUCTURE
IRRADIATION
PALLADIUM ALLOYS
PLATINUM ALLOYS
QUANTUM WIRES
RADIOLYSIS
SILVER ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY