Self-organised synthesis of Rh nanostructures with tunable chemical reactivity
1 Dipartimento di Fisica, Università di Genova and CNISM, Via Dodecaneso 33, 16146, Genova, Italy
2 Sincrotrone Trieste S.C.p.A, S.S. 14 Km 163.5, 34012, Trieste, Italy
3 Physics Department and Center of Excellence for Nanostructured Materials, Trieste University, Via Valerio 2, 34127, Trieste, Italy
4 Laboratorio TASC INFM-CNR, S.S. 14 Km 163.5, 34012, Trieste, Italy
Nanoscale Research Letters 2007, 2:251-264 doi:10.1007/s11671-007-9059-3Published: 22 May 2007
Nonequilibrium periodic nanostructures such as nanoscale ripples, mounds and rhomboidal pyramids formed on Rh(110) are particularly interesting as candidate model systems with enhanced catalytic reactivity, since they are endowed with steep facets running along nonequilibrium low-symmetry directions, exposing a high density of undercoordinated atoms. In this review we report on the formation of these novel nanostructured surfaces, a kinetic process which can be controlled by changing parameters such as temperature, sputtering ion flux and energy. The role of surface morphology with respect to chemical reactivity is investigated by analysing the carbon monoxide dissociation probability on the different nanostructured surfaces.