Abstract
We report on the correlation between the nanocrystal and surface alloy properties with the bimetallic composition of gold-platinum(AuPt) nanoparticles. The fundamental understanding of whether the AuPt nanocrystal core is alloyed or phase-segregated and how the surface binding properties are correlated with the nanoscale bimetallic properties is important not only for the exploitation of catalytic activity of the nanoscale bimetallic catalysts, but also to the general exploration of the surface or interfacial reactivities of bimetallic or multimetallic nanoparticles. The AuPt nanoparticles are shown to exhibit not only single-phase alloy character in the nanocrystal, but also bimetallic alloy property on the surface. The nanocrystal and surface alloy properties are directly correlated with the bimetallic composition. The FTIR probing of CO adsorption on the bimetallic nanoparticles supported on silica reveals that the surface binding sites are dependent on the bimetallic composition. The analysis of this dependence further led to the conclusion that the relative Au-atop and Pt-atop sites for the linear CO adsorption on the nanoparticle surface are not only correlated with the bimetallic composition, but also with the electronic effect as a result of the d-band shift of Pt in the bimetallic nanocrystals, which is the first demonstration of the nanoscale core-surface property correlation for the bimetallic nanoparticles over a wide range of bimetallic composition.
Highlights
We report on the correlation between the nanocrystal and surface alloy properties with the bimetallic composition of gold-platinum(AuPt) nanoparticles
One of the main problems is the lack of understanding of the nanoscale core-surface property correlation
There are two fundamental questions: (1) is the Au-Pt nanocrystal core alloy or phase-segregated? (2) how are the surface binding properties correlated with the nanoscale bimetallic properties? The answers to these questions have important implications to the exploitation of catalytic activity of the nanoscale bimetallic catalysts, and to the general exploration of the surface or Nanoscale Res Lett (2007) 2:12–16 interfacial reactivities of bimetallic or multimetallic nanoparticles
Summary
We report on the correlation between the nanocrystal and surface alloy properties with the bimetallic composition of gold-platinum(AuPt) nanoparticles. Au-Pt nanoparticles of 2~4 nm diameter are investigated to address some of the fundamental questions on the nanoscale phase and surface binding properties in view of the recent ability to synthesize Au-Pt nanoparticles with a wide range of bimetallic composition [4].
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