Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.101: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Particle Size Dependent Heat of Adsorption for CO on supported Pd Nanoparticles — •Jan-Henrik Fischer-Wolfarth1, Jose Manuel Flores-Camacho1, Jason Farmer2, Charles Campbell2, Jens Hartmann1, Swetlana Schauermann1, and Hans-Joachim Freund1 — 1Fritz-Haber-Institute of the Max-Planck-Society, Faradayweg 4-6, 14195 Berlin, Germany — 2Department of Chemistry, University of Washington, Seattle, USA
The particle size dependence of the heat of adsorption for carbon monoxide on supported Pd nanoparticles has been investigated at 300 K with a new single crystal microcalorimeter and compared to the heat of adsorption on Pd(111). The average Pd particle size was varied systematically in the range of 100 to 4900 Pd atoms, i.e. 2 to 8 nm diameter. All nanoparticles were supported on Fe3O4(111)/Pt(111). The initial heat of adsorption was found to decrease monotonically with decreasing particle size below 4 nm. The correlation of the heat of adsorption with a particle size dependent reduction of the particle lattice constant [1] will be discussed.
Further, the microcalorimetry technique used to determine the adsorption energies and its performance will be presented.
[1] Nepijko et al. Langmuir 15 1999 5309