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.
Highlights
One-dimensional (1D) nanostructures are receiving an ever-increasing amount of attention from researchers in various disciplines because of their unusual quantum properties to their bulk counterparts and potential use as building blocks for the generation of nanoscale optical, electronic, photonic, and biological devices [1,2]
The molecular structure of Na7(H3O)Nb6O19·14H2O is further supported by the solid-state IR spectrum (Figure 1b), which is in agreement with the literature values [24]
It is noteworthy to point out, because of the nanosized diffusion distances for atoms moving between the contact areas, that the wirelike aggregates of Na7(H3O)Nb6O19·14H2O nanobelts can be converted into single-crystalline NaNbO3 nanobelts conveniently under high temperature
Summary
One-dimensional (1D) nanostructures are receiving an ever-increasing amount of attention from researchers in various disciplines because of their unusual quantum properties to their bulk counterparts and potential use as building blocks for the generation of nanoscale optical, electronic, photonic, and biological devices [1,2]. After a solid-phase transformation of Na7(H3O)Nb6O19·14H2O precursors in air, semi-ordered NaNbO3 nanobelt arrays were yielded without morphology deformation. A high-magnification SEM image (Figure 6b) indicates NaNbO3 nanobelt has the width of 0.1–0.5 μm.
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