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Reactivity And Sintering Kinetics Of Au/Tio2(110) Model Catalysts: Particle Size Effects, Stephen C. Parker, Charles T. Campbell
Reactivity And Sintering Kinetics Of Au/Tio2(110) Model Catalysts: Particle Size Effects, Stephen C. Parker, Charles T. Campbell
Faculty Work
We review here our studies of the reactivity and sintering kinetics of model catalysts consisting of gold nanoparticles dispersed on TiO2(110). First, the nucleation and growth of vapor-deposited gold on this surface was experimentally examined using x-ray photoelectron spectroscopy and low energy ion scattering. Gold initially grows as two-dimensional islands up to a critical coverage, hcr, after which 3D gold nanoparticles grow. The results at different temperatures are fitted well with a kinetic model, which includes various energetic parameters for Au adatom migration. Oxygen was dosed onto the resulting gold nanoparticles using a hot filament technique. The desorption energy of …