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Título

Room temperature sintering of polar ZnO nanosheets: II-mechanism

AutorFernández Pérez, Amparo ; Rodríguez Casado, Verónica; Valdés-Solís Iglesias, Teresa ; Marbán Calzón, Gregorio
Fecha de publicación6-jun-2017
EditorRoyal Society of Chemistry (Great Britain)
CitaciónPhysical Chemistry Chemical Physics 19(25): 16413-16425 (2017)
ResumenIn a previous work by the authors (A. Fernández-Pérez el al., Room temperature sintering of polar ZnO nanosheets: I-evidence, 2017, DOI: 10.1039/C7CP02306E), polar ZnO nanosheets were stored at room temperature under different atmospheres and the evolution of their textural and crystal properties during storage was followed. It was found that the specific surface area of the nanosheets drastically decreased during storage, with a loss of up to 75%. The ZnO crystals increased in size mainly through the partial merging of their polar surfaces at the expense of narrow mesoporosity, in a process triggered by the action of moisture, oxygen and, in their absence, by light. In the present work, a set of spectroscopic techniques (FTIR, Raman and XPS) has been used in an attempt to unravel the mechanism behind this spontaneous sintering process. The mechanism starts with the molecular adsorption of water, which takes place on Zn atoms close to oxygen vacancies on the (100) surface, where H2O dissociates to form two hydroxyl groups and to heal one oxygen vacancy. This process triggers the room temperature migration of Zn interstitials towards the outer surface of the polar region. What were previously interstitial Zn atoms now gradually occupy the mesopores, with interstitial oxygen being used to build up the O sublattice until total occupancy of the narrow mesoporosity is achieved.
Versión del editorhttps://doi.org/ 10.1039/C7CP02307C
URIhttp://hdl.handle.net/10261/156188
DOI10.1039/C7CP02307C
ISSN1463-9076
E-ISSN1463-9084
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