Zpomalení difúze atomů pomocí adsorbátu: Co na Pt(111) s a bez preadsorbovaného CO

Slowing down adatom diffusion by an adsorbate: Co on Pt(111) with and without preadsorbed CO

článek v časopise - ostatní, Jost

en

Submonolayer deposition of cobalt on Pt(111) was studied by scanning tunneling microscopy at room temperature. It was found that deposition on a surface with adsorbed carbon monoxide (saturation coverage) leads to an island density almost ten times as high as that resulting from deposition on the clean platinum surface. Based on nucleation theory, we explain this fact as the result of a reduction of the diffusion coefficient of the Co adatoms in the presence of CO by more than two orders of magnitude. This effect is attributed to the displacement and/or rearrangement of the CO molecules necessary when Co adatoms diffuse over the "crowded" surface.

Podmonovrstevní pokrytí PT(111) kobaltem bylo studováno pomocí STM za pokojové teploty.

Submonolayer deposition of cobalt on Pt(111) was studied by scanning tunneling microscopy at room temperature. It was found that deposition on a surface with adsorbed carbon monoxide (saturation coverage) leads to an island density almost ten times as high as that resulting from deposition on the clean platinum surface. Based on nucleation theory, we explain this fact as the result of a reduction of the diffusion coefficient of the Co adatoms in the presence of CO by more than two orders of magnitude. This effect is attributed to the displacement and/or rearrangement of the CO molecules necessary when Co adatoms diffuse over the "crowded" surface.

EPITAXIAL-GROWTH, ISLAND GROWTH, FILMS, NUCLEATION, ADSORPTION, METAL

2003

01.01.2003

1098-0121

PHYSICAL REVIEW B

68

23

7