Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles

Long Luo; Janis Timoshenko; Aliya S Lapp; Anatoly I Frenkel; Richard M Crooks

doi:10.1021/acs.langmuir.7b02857

Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles

Langmuir. 2017 Oct 31;33(43):12434-12442. doi: 10.1021/acs.langmuir.7b02857. Epub 2017 Oct 9.

Authors

Long Luo¹, Janis Timoshenko², Aliya S Lapp¹, Anatoly I Frenkel², Richard M Crooks¹

Affiliations

¹ Department of Chemistry and Texas Materials Institute, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712, United States.
² Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States.

PMID: 28991487
DOI: 10.1021/acs.langmuir.7b02857

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.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't