Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 13, Issue 20, Pages 5798-5803Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200700034
Keywords
crystal growth; nanostructures; oriented attachment; phase transitions
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Bottom-up methods to obtain nanocrystals usually result in metastable phases, even in processes carried out at room temperature or under soft annealing conditions. However, stable phases, often associated with anisotropic shapes, are obtained in only a few special cases. In this paper we report on the synthesis of two well-studied oxides-titanium and zirconium oxide-in the nanometric range, by a novel route based on the decomposition of peroxide complexes of the two metals under hydrothermal soft conditions, obtaining metastable and stable phases in both cases through transformation. High-resolution transmission electron microscopy analysis reveals the existence of typical defects relating to growth by the oriented attachment mechanism in the stable crystals. The results suggest that the mechanism is associated to the phase transformation of these structures.
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