Stabilization of Zinc-Terminated ZnO(0001) by a Modified Surface Stoichiometry

Autor(en): Torbruegge, Stefan
Ostendorf, Frank
Reichling, Michael 
Stichwörter: Chemistry; Chemistry, Physical; HYDROGEN; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; OXIDE SURFACES; POLAR; Science & Technology - Other Topics; STABILITY
Erscheinungsdatum: 2009
Herausgeber: AMER CHEMICAL SOC
Journal: JOURNAL OF PHYSICAL CHEMISTRY C
Volumen: 113
Ausgabe: 12
Startseite: 4909
Seitenende: 4914
Zusammenfassung: 
The stabilization of polar oxide surfaces is of fundamental interest for understanding many processes in surface chemistry. We study the zinc-terminated Zn-ZnO(0001), a surface important in heterogeneous catalysis, by highest resolution scanning force microscopy (SFM) operated in the noncontact mode (NC-AFM). While most of the surface morphology is dominated by a phase consisting of triangular shaped nanostructures, we observe a coexisting (1 x 3) reconstructed phase where the reconstruction is ascribed to the formation of missing Zn-rows. Our findings provide evidence that the electrostatic instability of the polar Zn-ZnO(0001) surface can be canceled by a reduction of the surface charge by 1/3 which is considerably larger than the value of 1/4 derived from a simple ionic model for polar stabilization. Within the presented model for the (1 x 3) reconstruction, the role of point defects tentatively ascribed to hydrogen adsorbed on top of double Zn-rows forming zinc-hydride is discussed.
ISSN: 19327447
DOI: 10.1021/jp804026v

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