Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse Micelle Encapsulation
Abbreviated Journal Title
J. Am. Chem. Soc.
RAY-ABSORPTION-SPECTROSCOPY; ENVIRONMENTAL ELECTRON-MICROSCOPY; SUPPORTED METAL NANOPARTICLES; DEPENDENT CATALYTIC-ACTIVITY; L-EDGE; XANES; ATOMIC-SCALE; PLATINUM NANOPARTICLES; COLLOIDAL SOLUTION; FINE-STRUCTURE; SHAPE; Chemistry, Multidisciplinary
The structure, size, and shape of gamma-Al(2)O(3)-supported Pt nanoparticles (NPs) synthesized by inverse micelle encapsulation have been resolved via a synergistic combination of imaging and spectroscopic tools. It is shown that this synthesis method leads to 3D NP shapes even for subnanometer clusters, in contrast to the raft-like structures obtained for the same systems via traditional deposition-precipitation methods. Furthermore, a high degree of atomic ordering is observed for the micellar NPs in H(2) atmosphere at all sizes studied, possibly due to H-induced surface reconstruction in these high surface area clusters. Our findings demonstrate that the influence of NP/support interactions on NP structure can be diminished in favor of NP/adsorbate interactions when NP catalysts are prepared by micelle encapsulation methods.
Journal of the American Chemical Society
"Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse Micelle Encapsulation" (2010). Faculty Bibliography 2010s. 73.