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

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

Materials Science and Engineering

University of Texas at Austin
Wayne State University
Stony Brook University

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

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.

Original language	English
Pages (from-to)	12434-12442
Number of pages	9
Journal	Langmuir
Volume	33
Issue number	43
DOIs	https://doi.org/10.1021/acs.langmuir.7b02857
State	Published - Oct 31 2017

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title = "Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles",

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.",

author = "Long Luo and Janis Timoshenko and Lapp, \{Aliya S.\} and Frenkel, \{Anatoly I.\} and Crooks, \{Richard M.\}",

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doi = "10.1021/acs.langmuir.7b02857",

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T1 - Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles

AU - Luo, Long

AU - Timoshenko, Janis

AU - Lapp, Aliya S.

AU - Frenkel, Anatoly I.

AU - Crooks, Richard M.

PY - 2017/10/31

Y1 - 2017/10/31

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85032749990

U2 - 10.1021/acs.langmuir.7b02857

DO - 10.1021/acs.langmuir.7b02857

M3 - Article

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AN - SCOPUS:85032749990

SN - 0743-7463

VL - 33

SP - 12434

EP - 12442

JO - Langmuir

JF - Langmuir

IS - 43

ER -

Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles

Abstract

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