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Published on: December 4, 2016
Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles
Long Luo1, Janis Timoshenko2, Aliya S Lapp1
1Department of Chemistry and Texas Materials Institute, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712, United States.
Abstract:
We report the structural characterization of 1-2 nm Rh and RhAu alloy dendrimer-encapsulated nanoparticles (DENs) prepared by chemical reduction with NaBH4. In contrast to previously reported results, in situ and ex situ X-ray absorption spectroscopic experiments indicate that only a fraction of the Rh3+ present in the precursors are reduced by NaBH4. Additional structural analysis of RhAu alloy DENs using extended X-ray absorption fine structure spectroscopy leads to a model in which there is significant segregation of Rh and Au within the nanoparticles. In Rh-rich alloy DENs, Au atoms are segregated on the nanoparticle surface.
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