title: IR spectroscopic observation of molecular transport through Pt@CoO yolk-shell nanostructures.
abstract: FTIR spectroscopy has been used to monitor the transport of CO to the Pt cores of Pt@CoO nanoparticles forming CO/Pt species. It was found that external Pt sites are not present on the outer surfaces of the approximately 10 nm diameter nanostructures and that CO transports to Pt adsorption sites by an activated surface diffusion process through the CoO shells surrounding approximately 2 nm diameter Pt cores. The CO transport process is not due to gas-phase transport below 300 K. The weakly bound adsorbed CO/CoO species responsible for transport was directly observed at approximately 2147 cm(-1) during transport through the CoO shells.
authors.affiliation: Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA.
authors.forename: Sunhee
authors.initials: S
authors.lastname: Kim
authors.forename: Yadong
authors.initials: Y
authors.lastname: Yin
authors.forename: A Paul
authors.initials: AP
authors.lastname: Alivisatos
authors.forename: Gabor A
authors.initials: GA
authors.lastname: Somorjai
authors.forename: John T
authors.initials: JT
authors.lastname: Yates