title: Reversible shape changes of Pd nanoparticles on MgO(100).
abstract: We studied the interaction of oxygen with MgO(100) supported Pd nanoparticles at 10(-5) mbar oxygen pressure and a sample temperature of 570 K. We employed high-resolution X-ray reciprocal space mapping, which allows us to resolve the average particle shape from the quantitative analysis of intensity diffraction rods running perpendicular to corresponding facet surfaces. We identified the oxygen induced formation of nanosized (112) facets which is reversible in a CO atmosphere. Our results give direct evidence for the microscopic evolution of the nanoparticle shape under reactant exposure, which is essential for an atomistic understanding of catalytic reactions on nanoparticles.
authors: Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany.
authors: Philipp
authors: P
authors: Nolte
authors: Andreas
authors: A
authors: Stierle
authors: Nikolai
authors: N
authors: Kasper
authors: N Yun
authors: NY
authors: Jin-Phillipp
authors: Nicole
authors: N
authors: Jeutter
authors: Helmut
authors: H
authors: Dosch
mesh_terms: D008277:Magnesium Oxide / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010100:Oxygen; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D008277:Magnesium Oxide; D010165:Palladium; D010100:Oxygen