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Acetylene reactions over a Pd/W(111) surface are found to exhibit size effects on the nanometer scale. Upon annealing 1 ML Pd/W(111), pyramidal facets are formed having bcc(211) faces with nanometer dimensions. The facets grow as a function of annealing time and temperature. Temperature-programmed desorption (TPD) spectra of benzene and ethylene, formed reactively following acetylene adsorption, change...
When faceting occurs, an initially planar surface converts to a 'hill-and-valley' structure, typically exposing low-Miller-index crystal faces of microscopic dimensions. The bcc W(111) and Mo(111) surfaces are morphologically unstable when covered by monolayer films of certain metals (including Rh, Pd, Ir, Pt, Au), and they become 'nanotextured' upon annealing at T>700K: the surface is covered...
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