When imaged by scanning tunneling microscopy (STM) at constant current under nontopographic conditions, nanosized MgO islands grown on Ag(100) may show a fractal dark internal structure and/or appear embedded in the surface. On the contrary, when imaged under topographic conditions, the same islands appear as nearly flat plateaus. Islands showing different contrast and a different contrast dependence on sample bias have been often reported in the literature, but a thorough explanation is still missing. Here we demonstrate, on the basis of of experimental data and computational results, that such structure is due to the accumulation of oxygen at the MgO islands-substrate interface. Interestingly, interfacial oxygen concentrates at the center of the islands.

Savio, L., Smerieri, M., Vattuone, L., Tosoni, S., Pacchioni, G., Rocca, M. (2020). Interface Oxygen Induced Internal Structures of Ultrathin MgO Islands Grown on Ag(100). JOURNAL OF PHYSICAL CHEMISTRY. C, 124(16), 8834-8842 [10.1021/acs.jpcc.0c01248].

Interface Oxygen Induced Internal Structures of Ultrathin MgO Islands Grown on Ag(100)

Tosoni S.;Pacchioni G.;
2020

Abstract

When imaged by scanning tunneling microscopy (STM) at constant current under nontopographic conditions, nanosized MgO islands grown on Ag(100) may show a fractal dark internal structure and/or appear embedded in the surface. On the contrary, when imaged under topographic conditions, the same islands appear as nearly flat plateaus. Islands showing different contrast and a different contrast dependence on sample bias have been often reported in the literature, but a thorough explanation is still missing. Here we demonstrate, on the basis of of experimental data and computational results, that such structure is due to the accumulation of oxygen at the MgO islands-substrate interface. Interestingly, interfacial oxygen concentrates at the center of the islands.
Articolo in rivista - Articolo scientifico
SCANNING-TUNNELING-MICROSCOPY; METAL-CLUSTERS; THIN-FILMS; MORPHOLOGY; AG(001);
English
8834
8842
9
Savio, L., Smerieri, M., Vattuone, L., Tosoni, S., Pacchioni, G., Rocca, M. (2020). Interface Oxygen Induced Internal Structures of Ultrathin MgO Islands Grown on Ag(100). JOURNAL OF PHYSICAL CHEMISTRY. C, 124(16), 8834-8842 [10.1021/acs.jpcc.0c01248].
Savio, L; Smerieri, M; Vattuone, L; Tosoni, S; Pacchioni, G; Rocca, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/289158
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