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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 Low-magnification SEM images of Na7(H3O)Nb6O19·14H2O nanobelts, indicating the honeycomb-like micropattern. c, d High-magnification SEM images. e, f TEM images of a single nanobelt, exhibiting contrasty stripes along the growth direction. The nanobelts are composed of many smaller size nanobelts shown with a red circle.
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Figure 2: a, b Low-magnification SEM images of Na7(H3O)Nb6O19·14H2O nanobelts, indicating the honeycomb-like micropattern. c, d High-magnification SEM images. e, f TEM images of a single nanobelt, exhibiting contrasty stripes along the growth direction. The nanobelts are composed of many smaller size nanobelts shown with a red circle.

Mentions: The low-magnification SEM images of Na7(H3O)Nb6O19·14H2O (Figure 2a, b) have been taken from randomly selected areas, and as such, these are representative of the overall sizes and shapes in the samples. It is seen that ultralong Na7(H3O)Nb6O19·14H2O nanobelt arrays are with honeycomb-like micropatterns. The length is in micrometer range. Furthermore, the high-magnification SEM images in Figure 2c, d reveal that these nanobelts are formed uniformly and compactly with typical widths of ~300 nm and thicknesses of ~80 nm. TEM and HRTEM images provide further insight into the microstructural details of belt-like nanostructures. Figure 2e shows that the nanobelt has a uniform width, and there are some contrasty stripes along the growth direction. A magnified image of a single nanobelt in Figure 2f exhibits clearly that the 1D structure is the belt-like aggregate morphology. The nanobelt bundles are essentially aligned in the same orientation and have different packing density resulting in the contrasty stripes in TEM observation. A cross-section of Na7(H3O)Nb6O19·14H2O nanobelt array is shown in Figure 3a. It is found that the nanobelts are typically ~50 μm in length, and they grow on an irregular-shaped microcrystal layer. EDX spectrum of the substrate in Figure 3b indicates the presence of Na, Nb, and O. Therefore, since the Nb metal foil is dissolved completely, it is a kind of sodium niobate substrate that induces the growth of Na7(H3O)Nb6O19·14H2O nanobelt.


In situ Precursor-Template Route to Semi-Ordered NaNbO 3 Nanobelt Arrays
a, b Low-magnification SEM images of Na7(H3O)Nb6O19·14H2O nanobelts, indicating the honeycomb-like micropattern. c, d High-magnification SEM images. e, f TEM images of a single nanobelt, exhibiting contrasty stripes along the growth direction. The nanobelts are composed of many smaller size nanobelts shown with a red circle.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3211187&req=5

Figure 2: a, b Low-magnification SEM images of Na7(H3O)Nb6O19·14H2O nanobelts, indicating the honeycomb-like micropattern. c, d High-magnification SEM images. e, f TEM images of a single nanobelt, exhibiting contrasty stripes along the growth direction. The nanobelts are composed of many smaller size nanobelts shown with a red circle.
Mentions: The low-magnification SEM images of Na7(H3O)Nb6O19·14H2O (Figure 2a, b) have been taken from randomly selected areas, and as such, these are representative of the overall sizes and shapes in the samples. It is seen that ultralong Na7(H3O)Nb6O19·14H2O nanobelt arrays are with honeycomb-like micropatterns. The length is in micrometer range. Furthermore, the high-magnification SEM images in Figure 2c, d reveal that these nanobelts are formed uniformly and compactly with typical widths of ~300 nm and thicknesses of ~80 nm. TEM and HRTEM images provide further insight into the microstructural details of belt-like nanostructures. Figure 2e shows that the nanobelt has a uniform width, and there are some contrasty stripes along the growth direction. A magnified image of a single nanobelt in Figure 2f exhibits clearly that the 1D structure is the belt-like aggregate morphology. The nanobelt bundles are essentially aligned in the same orientation and have different packing density resulting in the contrasty stripes in TEM observation. A cross-section of Na7(H3O)Nb6O19·14H2O nanobelt array is shown in Figure 3a. It is found that the nanobelts are typically ~50 μm in length, and they grow on an irregular-shaped microcrystal layer. EDX spectrum of the substrate in Figure 3b indicates the presence of Na, Nb, and O. Therefore, since the Nb metal foil is dissolved completely, it is a kind of sodium niobate substrate that induces the growth of Na7(H3O)Nb6O19·14H2O nanobelt.

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.