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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.


Morphology and composition characterizations of LiNbO3 nanorods. SEM images (a, b) and XRD pattern (c) of LiNbO3 nanorods obtained through calcination of Nb2O5 nanorod precursors and LiOH at 500°C for 4 h. All the peaks in Figure 8c totally overlap with those of the rhombohedral LiNbO3 (JCPDS no. 20-0631), and no evidence of impurities was detected.
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Figure 8: Morphology and composition characterizations of LiNbO3 nanorods. SEM images (a, b) and XRD pattern (c) of LiNbO3 nanorods obtained through calcination of Nb2O5 nanorod precursors and LiOH at 500°C for 4 h. All the peaks in Figure 8c totally overlap with those of the rhombohedral LiNbO3 (JCPDS no. 20-0631), and no evidence of impurities was detected.

Mentions: These Nb2O5 nanotubes and nanorods can be used as versatile templates to fabricate MNbO3 (M = Li, Na, K) nanotubes and nanorods. For example, when Nb2O5 nanorod precursors directly reacted with LiOH at high temperature, LiNbO3 nanorods were immediately achieved. As shown in Figure 8a, b, the morphology of Nb2O5 templates is preserved. XRD pattern of the calcination products (Figure 8c) clearly shows the pure-phase LiNbO3 ferroelectric materials. These LiNbO3 nanorods were obtained through calcination of Nb2O5 and LiOH with appropriate amount ratios at 500°C for 4 h. This calcination method is general and versatile, and it can be applied to fabricate other niobate materials such as NaNbO3 and KNbO3. The optical properties of these Nb-based nanomaterials (LiNbO3, NaNbO3, and KNbO3) are shown in Figure S1 in Additional file 1).


Single-crystalline nanoporous Nb2O5 nanotubes.

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

Morphology and composition characterizations of LiNbO3 nanorods. SEM images (a, b) and XRD pattern (c) of LiNbO3 nanorods obtained through calcination of Nb2O5 nanorod precursors and LiOH at 500°C for 4 h. All the peaks in Figure 8c totally overlap with those of the rhombohedral LiNbO3 (JCPDS no. 20-0631), and no evidence of impurities was detected.
© Copyright Policy - open-access
Related In: Results  -  Collection

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Figure 8: Morphology and composition characterizations of LiNbO3 nanorods. SEM images (a, b) and XRD pattern (c) of LiNbO3 nanorods obtained through calcination of Nb2O5 nanorod precursors and LiOH at 500°C for 4 h. All the peaks in Figure 8c totally overlap with those of the rhombohedral LiNbO3 (JCPDS no. 20-0631), and no evidence of impurities was detected.
Mentions: These Nb2O5 nanotubes and nanorods can be used as versatile templates to fabricate MNbO3 (M = Li, Na, K) nanotubes and nanorods. For example, when Nb2O5 nanorod precursors directly reacted with LiOH at high temperature, LiNbO3 nanorods were immediately achieved. As shown in Figure 8a, b, the morphology of Nb2O5 templates is preserved. XRD pattern of the calcination products (Figure 8c) clearly shows the pure-phase LiNbO3 ferroelectric materials. These LiNbO3 nanorods were obtained through calcination of Nb2O5 and LiOH with appropriate amount ratios at 500°C for 4 h. This calcination method is general and versatile, and it can be applied to fabricate other niobate materials such as NaNbO3 and KNbO3. The optical properties of these Nb-based nanomaterials (LiNbO3, NaNbO3, and KNbO3) are shown in Figure S1 in Additional file 1).

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.