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Single-crystalline nanoporous Nb2O5 nanotubes.

Liu J, Xue D, Li K - Nanoscale Res Lett (2011)

Bottom Line: Dense nanopores with the diameters of several nanometers were created on the shell of Nb2O5 tubular structures, which can also retain the crystallographic orientation of Nb2O5 precursor nanorods.The present chemical etching strategy is versatile and can be extended to different-sized nanorod precursors.Furthermore, these as-obtained nanorod precursors and nanotube products can also be used as template for the fabrication of 1 D nanostructured niobates, such as LiNbO3, NaNbO3, and KNbO3.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Fine Chemicals, Department of Materials Science and Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China. dfxue@dlut.edu.cn.

ABSTRACT
Single-crystalline nanoporous Nb2O5 nanotubes were fabricated by a two-step solution route, the growth of uniform single-crystalline Nb2O5 nanorods and the following ion-assisted selective dissolution along the [001] direction. Nb2O5 tubular structure was created by preferentially etching (001) crystallographic planes, which has a nearly homogeneous diameter and length. Dense nanopores with the diameters of several nanometers were created on the shell of Nb2O5 tubular structures, which can also retain the crystallographic orientation of Nb2O5 precursor nanorods. The present chemical etching strategy is versatile and can be extended to different-sized nanorod precursors. Furthermore, these as-obtained nanorod precursors and nanotube products can also be used as template for the fabrication of 1 D nanostructured niobates, such as LiNbO3, NaNbO3, and KNbO3.

No MeSH data available.


Optical properties of Nb2O5 nanorod precursors and nanotube products. UV-Vis spectra (a) and the corresponding (αhv)2 versus photo energy (hv) plots (b) of Nb2O5 nanorods and nanotubes measured at room temperature.
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Figure 9: Optical properties of Nb2O5 nanorod precursors and nanotube products. UV-Vis spectra (a) and the corresponding (αhv)2 versus photo energy (hv) plots (b) of Nb2O5 nanorods and nanotubes measured at room temperature.

Mentions: UV-Vis adsorption measurement was used to reveal the energy structure and optical property of the as-prepared Nb2O5 nanorods and finally porous nanotube products. UV-Vis adsorption spectra of Nb2O5 nanorods and nanotubes are presented in Figure 9a. It can be seen from Figure 9a that the structure transformation from solid nanorods to nanoporous nanotubes is accompanied by distinct changes in the UV-Vis spectra because of the significant difference in shape between nanorod precursors and nanotube products. As a direct band gap semiconductor, the optical absorption near the band edge follows the formula


Single-crystalline nanoporous Nb2O5 nanotubes.

Liu J, Xue D, Li K - Nanoscale Res Lett (2011)

Optical properties of Nb2O5 nanorod precursors and nanotube products. UV-Vis spectra (a) and the corresponding (αhv)2 versus photo energy (hv) plots (b) of Nb2O5 nanorods and nanotubes measured at room temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211185&req=5

Figure 9: Optical properties of Nb2O5 nanorod precursors and nanotube products. UV-Vis spectra (a) and the corresponding (αhv)2 versus photo energy (hv) plots (b) of Nb2O5 nanorods and nanotubes measured at room temperature.
Mentions: UV-Vis adsorption measurement was used to reveal the energy structure and optical property of the as-prepared Nb2O5 nanorods and finally porous nanotube products. UV-Vis adsorption spectra of Nb2O5 nanorods and nanotubes are presented in Figure 9a. It can be seen from Figure 9a that the structure transformation from solid nanorods to nanoporous nanotubes is accompanied by distinct changes in the UV-Vis spectra because of the significant difference in shape between nanorod precursors and nanotube products. As a direct band gap semiconductor, the optical absorption near the band edge follows the formula

Bottom Line: Dense nanopores with the diameters of several nanometers were created on the shell of Nb2O5 tubular structures, which can also retain the crystallographic orientation of Nb2O5 precursor nanorods.The present chemical etching strategy is versatile and can be extended to different-sized nanorod precursors.Furthermore, these as-obtained nanorod precursors and nanotube products can also be used as template for the fabrication of 1 D nanostructured niobates, such as LiNbO3, NaNbO3, and KNbO3.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Fine Chemicals, Department of Materials Science and Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China. dfxue@dlut.edu.cn.

ABSTRACT
Single-crystalline nanoporous Nb2O5 nanotubes were fabricated by a two-step solution route, the growth of uniform single-crystalline Nb2O5 nanorods and the following ion-assisted selective dissolution along the [001] direction. Nb2O5 tubular structure was created by preferentially etching (001) crystallographic planes, which has a nearly homogeneous diameter and length. Dense nanopores with the diameters of several nanometers were created on the shell of Nb2O5 tubular structures, which can also retain the crystallographic orientation of Nb2O5 precursor nanorods. The present chemical etching strategy is versatile and can be extended to different-sized nanorod precursors. Furthermore, these as-obtained nanorod precursors and nanotube products can also be used as template for the fabrication of 1 D nanostructured niobates, such as LiNbO3, NaNbO3, and KNbO3.

No MeSH data available.