Identifying the Atomic-Level Effects of Metal Composition on the Structure and Catalytic Activity of Peptide-Templated Materials

Bioinspired approaches for the formation of metallic nanomaterials have been extensively employed for a diverse range of applications including diagnostics and catalysis. These materials can often be used under sustainable conditions; however, it is challenging to control the material size, morpholo...

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Bibliographic Details
Published in:ACS nano 2015-12, Vol.9 (12), p.11968-11979
Main Authors: Merrill, Nicholas A, McKee, Erik M, Merino, Kyle C, Drummy, Lawrence F, Lee, Sungsik, Reinhart, Benjamin, Ren, Yang, Frenkel, Anatoly I, Naik, Rajesh R, Bedford, Nicholas M, Knecht, Marc R
Format: Article
Language:English
Subjects:
bimetallic nanostructures
bioinspired
Catalysis
Gold - chemistry
Hydrophobic and Hydrophilic Interactions
MATERIALS SCIENCE
Metal Nanoparticles - chemistry
peptide templates
Peptides - chemistry
Peptides - metabolism
Silver - chemistry
x-ray analysis
X-Ray Diffraction
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Summary:Bioinspired approaches for the formation of metallic nanomaterials have been extensively employed for a diverse range of applications including diagnostics and catalysis. These materials can often be used under sustainable conditions; however, it is challenging to control the material size, morphology, and composition simultaneously. Here we have employed the R5 peptide, which forms a 3D scaffold to direct the size and linear shape of bimetallic PdAu nanomaterials for catalysis. The materials were prepared at varying Pd:Au ratios to probe optimal compositions to achieve maximal catalytic efficiency. These materials were extensively characterized at the atomic level using transmission electron microscopy, extended X-ray absorption fine structure spectroscopy, and atomic pair distribution function analysis derived from high-energy X-ray diffraction patterns to provide highly resolved structural information. The results confirmed PdAu alloy formation, but also demonstrated that significant surface structural disorder was present. The catalytic activity of the materials was studied for olefin hydrogenation, which demonstrated enhanced reactivity from the bimetallic structures. These results present a pathway to the bioinspired production of multimetallic materials with enhanced properties, which can be assessed via a suite of characterization methods to fully ascertain structure/function relationships.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.5b04665