Non-aggregated Pd nanoparticles deposited onto catalytic supports |
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Authors: | C.E. Allmond V.P. Oleshko J.M. Howe J.M. Fitz-Gerald |
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Affiliation: | (1) Department of Material Science and Engineering, University of Virginia, 116 Engineers Way, Charlottesville, VA 22904, USA |
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Abstract: | Nanostructured powders have shown great promise for a variety of applications including chemical gas sensors, high surface area supports for catalysis, tribology, chemical mechanical polishing, and optoelectronics. In this report, highly dispersed Pd nanoparticles with a narrow size distribution, and mean diameter of 2±0.2 nm, were deposited at room temperature onto amorphous carbon and oxide supports (TiO2, Al2O3) by pulsed-laser ablation of a Pd sputtering target. Depositions were performed in Ar at a back-fill pressure of 3 mTorr after reaching a base pressure of 10-7 Torr. Populations of uniformly dispersed particles with an interparticle spacing of 3 to 10 nm were observed by high-resolution transmission electron microscopy with little evidence of nanoparticle aggregation. The chemical compositions of individual nanoparticles were confirmed by high spatial resolution energy-dispersive X-ray spectroscopy. |
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