首页|In-situ anisotropic growth of nickel oxide nanostructures through layer-by-layer metal oxidation
In-situ anisotropic growth of nickel oxide nanostructures through layer-by-layer metal oxidation
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NSTL
Elsevier
This study reports the one-directional growth of single crystalline nickel oxide nanostructures that is facilitated by the oxidation of nickel nanoparticles. Layer-by-layer growth at the buried NiO/Ni interface was directly observed by in-situ high resolution transmission electron microscopy at 650 degrees C in an oxygen partial pressure around 4 x 10(-4) Pa. Individual layers of NiO grow by ledge movement, i.e., disconnection migration along the oxide/metal interface plane. Oxidation at interfacial steps is governed by oxygen vacancy migration along the interface plane, while the junction between the oxide/metal interface and the gas phase serves as nucleation site. The results of this study demonstrate the applicability of the terrace-ledge-kink crystal growth model for reactive crystal growth processes at internal heterophase interfaces.
OxidationCrystal growthIn-situ transmission electron microscopyInterfacesONE-DIMENSIONAL NANOSTRUCTURESHIGH-TEMPERATURE OXIDATIONDISLOCATION-DRIVEN GROWTHINTERFACE STRUCTURESOLID GROWTHLEDGE-FLOWMECHANISMKINETICSDISCONNECTIONSNANOWIRES
NSTL
Elsevier
