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| Title
| - Structural Rearrangement of Bimetallic Alloy PdAu Nanoparticles within Dendrimer Templates to Yield Core/Shell Configurations
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| Abstract
| - Here we present evidence for an oxidation-driven structural conversion of quasi-alloy PdAu dendrimer-encapsulated nanoparticles (DENs) to a Au-core/Pd-shell configuration. The initial quasialloy was prepared by co-complexation of PdCl42− and AuCl4− within a sixth-generation, poly(amidoamine) dendrimer template followed by chemical reduction. Exposure to air resulted in selective reoxidation of the Pd atoms and subsequent re-reduction led to deposition of a Pd-rich shell on the surface of the remaining Au core. The core/shell nanoparticles were extracted as monolayer-protected clusters (MPCs) from within the dendrimer templates using dodecanethiol. The resulting materials were characterized by UV−vis spectroscopy, transmission electron microscopy, and extended X-ray absorption fine structure (EXAFS) spectroscopy.
- EXAFS analysis of bimetallic PdAu dendrimer-encapsulated nanoparticles indicates that the materials are in a quasirandom alloy structure that has minimal interactions with the dendrimer. Upon thiol extraction as a monolayer-protected cluster, the particle rearranges to form a structure having a Au-rich core and a Pd-rich shell.
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| Alternative Title
| - Rearrangement of Bimetallic Alloy PdAu DENs
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