Kinetic Monte Carlo study of the morphological evolution of the Pt discontinuous thin film on Au

MARIANA ISABEL ROJAS; EZEQUIEL PEDRO MARCOS LEIVA

Mar del Plata, Argentina

Congreso; 4th Latin-American Symposium on Scanning Probe Microscopy; 2007

LASPM

The evolution of non-uniform Pt film adsorbed on Au, in contact with a solution containing ions was studied by means of lattice gas/kinetic Monte Carlo simulations with pair potentials at 300K in the canonical ensemble [2]. We found that the evolution of the morphology takes place through two types of exchange: surface diffusion and diffusion mediated by the solution, which occur with different probabilities or rates and the reciprocal of the number of particles. This function was used to extrapolate the exchange rate to the system of macroscopic size. The standard exchange current density calculated from this value was . The morphological evolution of the film as a function of the time was also studied.