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Synthesis of ultrasmall, homogeneously alloyed, bimetallic nanoparticles on silica supports

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Science  23 Nov 2017:
eaao6538
DOI: 10.1126/science.aao6538

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Abstract

Supported nanoparticles containing more than one metal have a variety of applications in sensing, catalysis, and biomedicine. Common synthesis techniques for this type of material often result in large, unalloyed nanoparticles that lack the interactions between the two metals that give the particles their desired characteristics. We demonstrate a relatively simple, effective, generalizable method to produce highly-dispersed, well-alloyed bimetallic nanoparticles. Ten permutations of noble and base metals (Pt, Pd, Cu, Ni, and Co) were synthesized with average particle sizes from 0.9 to 1.4 nanometers, with tight size distributions. High-resolution imaging and x-ray analysis confirmed the homogeneity of alloying in these ultrasmall nanoparticles.

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