Abstract

We report studies of bimetallic nanoparticles with 15%-16% atomic crystal parameters size mismatch. The degree of alloying was probed in a 2-nm Pt core (smallest attainable core size) of Pt-Ag nanoparticles (completely immiscible in bulk) and 20-nm-diameter Pd-Ag nanowires (completely miscible in bulk). Particles were synthesized radiolytically, and depending on the initial parameters, they assume spherical or cylindrical (nanowire) morphologies. In all cases, the metals are seen to follow their bulk alloying characteristics. Pt and Ag segregate in both spherical and wire forms, which indicates that strain due to crystallographic mismatch overcomes the excess surface free energy in the small particles. The Pd-Ag nanowires alloy similar to previously reported spherical Pd-Ag particles of similar diameter and composition.

Department(s)

Chemistry

Second Department

Mining and Nuclear Engineering

Third Department

Physics

Sponsor(s)

United States. Department of Energy

Keywords and Phrases

Bimetallic; Pt-Ag and Pd-Ag Nanoparticles; Crystallographic Mismatch

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2005 American Institute of Physics (AIP), All rights reserved.

Full Text Link

Included in

Chemistry Commons

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