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In situ Precursor-Template Route to Semi-Ordered NaNbO 3 Nanobelt Arrays

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ABSTRACT

We exploited a precursor-template route to chemically synthesize NaNbO3 nanobelt arrays. Na7(H3O)Nb6O19·14H2O nanobelt precursor was firstly prepared via a hydrothermal synthetic route using Nb foil. The aspect ratio of the precursor is controllable facilely depending on the concentration of NaOH aqueous solution. The precursor was calcined in air to yield single-crystalline monoclinic NaNbO3 nanobelt arrays. The proposed scheme for NaNbO3 nanobelt formation starting from Nb metal may be extended to the chemical fabrication of more niobate arrays.

No MeSH data available.


a, b SEM images of NaNbO3 nanobelt at different magnifications. c TEM image of a single nanobelt. The arrow in top right shows a surface pit. d HRTEM image of the selected area in c.
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Figure 6: a, b SEM images of NaNbO3 nanobelt at different magnifications. c TEM image of a single nanobelt. The arrow in top right shows a surface pit. d HRTEM image of the selected area in c.

Mentions: Evidence that the nanobelts have retained their morphology is shown in Figure 6. The NaNbO3 nanobelt arrays still have ordered honeycomb-like micropatterns (Figure 6a). A high-magnification SEM image (Figure 6b) indicates NaNbO3 nanobelt has the width of 0.1–0.5 μm. The surface is clean and without any sheathed amorphous phase. A ripple-like contrast is observed due to the strain resulting from the bending of the belt. In addition, there are some pits on the surface, which may be generated by the high-temperature heat treatment (Figure 6c). HRTEM image taken from the edge area of a NaNbO3 nanobelt reveals that it is structurally uniform single-crystalline phase without any obvious defects and dislocations (Figure 6d). The 2D lattice fringes are oriented approximately 45° from the growth direction. The lattice-resolved image shows the fringes are separated by a distance of about 0.196 nm, which perfectly matches the lattice spacing of the (002) planes (1.959 Å) in the monoclinic NaNbO3 phase.


In situ Precursor-Template Route to Semi-Ordered NaNbO 3 Nanobelt Arrays
a, b SEM images of NaNbO3 nanobelt at different magnifications. c TEM image of a single nanobelt. The arrow in top right shows a surface pit. d HRTEM image of the selected area in c.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3211187&req=5

Figure 6: a, b SEM images of NaNbO3 nanobelt at different magnifications. c TEM image of a single nanobelt. The arrow in top right shows a surface pit. d HRTEM image of the selected area in c.
Mentions: Evidence that the nanobelts have retained their morphology is shown in Figure 6. The NaNbO3 nanobelt arrays still have ordered honeycomb-like micropatterns (Figure 6a). A high-magnification SEM image (Figure 6b) indicates NaNbO3 nanobelt has the width of 0.1–0.5 μm. The surface is clean and without any sheathed amorphous phase. A ripple-like contrast is observed due to the strain resulting from the bending of the belt. In addition, there are some pits on the surface, which may be generated by the high-temperature heat treatment (Figure 6c). HRTEM image taken from the edge area of a NaNbO3 nanobelt reveals that it is structurally uniform single-crystalline phase without any obvious defects and dislocations (Figure 6d). The 2D lattice fringes are oriented approximately 45° from the growth direction. The lattice-resolved image shows the fringes are separated by a distance of about 0.196 nm, which perfectly matches the lattice spacing of the (002) planes (1.959 Å) in the monoclinic NaNbO3 phase.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

We exploited a precursor-template route to chemically synthesize NaNbO3 nanobelt arrays. Na7(H3O)Nb6O19·14H2O nanobelt precursor was firstly prepared via a hydrothermal synthetic route using Nb foil. The aspect ratio of the precursor is controllable facilely depending on the concentration of NaOH aqueous solution. The precursor was calcined in air to yield single-crystalline monoclinic NaNbO3 nanobelt arrays. The proposed scheme for NaNbO3 nanobelt formation starting from Nb metal may be extended to the chemical fabrication of more niobate arrays.

No MeSH data available.