Hierarchical Three-Dimensional ZnO and Their Shape-Preserving Transformation into Hollow ZnAl2O4 Nanostructures
Identifieur interne : 000C30 ( Main/Exploration ); précédent : 000C29; suivant : 000C31Hierarchical Three-Dimensional ZnO and Their Shape-Preserving Transformation into Hollow ZnAl2O4 Nanostructures
Auteurs : Yang Yang [Allemagne] ; Dong Sik Kim [Allemagne] ; Roland Scholz [Allemagne] ; Mato Knez [Allemagne] ; Seung Mo Lee [Allemagne] ; Ulrich Gösele [Allemagne] ; Margit Zacharias [Allemagne]Source :
- Chemistry of Materials [ 0897-4756 ] ; 2008.
English descriptors
- Teeft :
- Alumina, Alumina layer, Annealing, Annealing temperature, Atmospheric pressure, Atomic layer deposition, Background pressure, Black circle, Chamber pressure, Chem, Deposition, Facet, Flow rate, Growth direction, Growth mechanism, Growth tube, Hierarchical, Hierarchical nanostructure, Hierarchical nanostructures, Hierarchical structure, High reaction temperature, Hollow polyhedron, Interfacial reaction, Kirkendall, Kirkendall effect, Lett, Lower temperature, Mater, Microcrystals, Microstructure physic, Nano lett, Nanobranches, Nanostructures, Nanostructures chem, Nanotube, Nanowire, Nanowires, Oxidation process, Oxidation rate, Phys, Planck institute, Polyhedral, Polyhedron, Precursor, Residual oxygen, Seed layer, Spinel, Steplike structure, Thermal evaporation, Thin layer, Tubular branch, Tubular structure, Various hierarchical, Wang, Xxxx, Xxxx yang.
Abstract
We present novel three-dimensional (3D) hierarchical ZnO and ZnAl2O4 nanostructures produced by multitransformation reactions using Zn as the starting material. In two representative instances selected for illustrating this strategy, various Zn precursors like Zn nanowires and polyhedral Zn microcrystals were first prepared by physical vapor deposition without any catalyst. Subsequently, we successfully synthesized branched ZnO nanowires and hollow ZnO polyhedrons with vertically aligned ZnO nanowires by oxidizing Zn nanowires and polyhedral Zn microcrystals, respectively, under optimal conditions. The growth of both ZnO nanobranches and vertically aligned nanowires was suggested as a self-supplying and self-catalytic process following the vapor transport solid condensation mechanism. Furthermore, the obtained ZnO nanostructures were homogeneously covered by a shell of amorphous Al2O3 using atomic layer deposition. Through the solid–solid interfacial reaction of ZnO and Al2O3, the 3D nanostructures were transformed to hierarchical ZnAl2O4 nanostructures conserving the shape of the corresponding ZnO nanostructures. Particularly, all the ZnAl2O4 nanobranches or vertically aligned 1D structures exhibited a tubular structure, which was induced by the nanoscale Kirkendall effect. This work demonstrates a simple and efficient pathway to design hierarchical ZnO and complex hollow zinc spinel nanostructures, which are expected to have potential applications in nanotechnology.
By oxidizing Zn nanowires or polyhedral Zn microcrystals under optimal conditions, novel hierarchical branched ZnO nanowires and hollow ZnO polyhedrons with perpendicularly aligned ZnO nanowires were synthesized, respectively. These ZnO nanostructures could be shape-preserving transformed into hollow ZnAl2O4 nanostructures by a combination of atomic layer deposition and solid−solid reaction.
Url:
DOI: 10.1021/cm7034807
Affiliations:
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<front><div type="abstract">We present novel three-dimensional (3D) hierarchical ZnO and ZnAl2O4 nanostructures produced by multitransformation reactions using Zn as the starting material. In two representative instances selected for illustrating this strategy, various Zn precursors like Zn nanowires and polyhedral Zn microcrystals were first prepared by physical vapor deposition without any catalyst. Subsequently, we successfully synthesized branched ZnO nanowires and hollow ZnO polyhedrons with vertically aligned ZnO nanowires by oxidizing Zn nanowires and polyhedral Zn microcrystals, respectively, under optimal conditions. The growth of both ZnO nanobranches and vertically aligned nanowires was suggested as a self-supplying and self-catalytic process following the vapor transport solid condensation mechanism. Furthermore, the obtained ZnO nanostructures were homogeneously covered by a shell of amorphous Al2O3 using atomic layer deposition. Through the solid–solid interfacial reaction of ZnO and Al2O3, the 3D nanostructures were transformed to hierarchical ZnAl2O4 nanostructures conserving the shape of the corresponding ZnO nanostructures. Particularly, all the ZnAl2O4 nanobranches or vertically aligned 1D structures exhibited a tubular structure, which was induced by the nanoscale Kirkendall effect. This work demonstrates a simple and efficient pathway to design hierarchical ZnO and complex hollow zinc spinel nanostructures, which are expected to have potential applications in nanotechnology.</div>
<div type="abstract">By oxidizing Zn nanowires or polyhedral Zn microcrystals under optimal conditions, novel hierarchical branched ZnO nanowires and hollow ZnO polyhedrons with perpendicularly aligned ZnO nanowires were synthesized, respectively. These ZnO nanostructures could be shape-preserving transformed into hollow ZnAl2O4 nanostructures by a combination of atomic layer deposition and solid−solid reaction.</div>
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