Single-cryst. nanobelts and nanorings of Na2V6O16·3H2O structures have been facilely synthesized through a direct hydrothermal reaction between NaVO3 and H3PO4, without the addn. of any harmful solvents or surfactants. The anal. techniques of SEM, transmission electron microscopy (TEM), powder X-ray diffraction, TGA, energy-dispersive X-ray spectroscopy, FTIR spectroscopy, high-resoln. TEM, and selected-area electron diffraction have been used to characterize the morphol., compn., and structure of the synthesized products. The Na2V6O16·3H2O nanobelts are up to several hundreds of micrometers in length and 100-300 nm in thickness, and for nanorings, the diams. are 4.5-6.5 μm. H3PO4 plays a key role in maintaining the pH of the soln. as well as producing PO43- ions in soln. The chem. reactions and a possible growth mechanism involved in the formation of Na2V6O16·3H2O nanobelts and nanorings are briefly discussed.
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