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Hydrothermal synthesis and characterization of self-assembled h-WO3 nanowires/nanorods using EDTA salts
One-dimensional (1D) self-assembled single-crystalline hexagonal tungsten oxide (h-WO3) nanostructures were synthesized by a hydrothermal method at 180 deg C using sodium tungstate, ethylenediaminetetraacetic (EDTA) salts of sodium or ammonium, and sodium sulfate. Controlled morphological modificati...
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Published in: | Journal of alloys and compounds 2009-05, Vol.475 (1-2), p.446-451 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | One-dimensional (1D) self-assembled single-crystalline hexagonal tungsten oxide (h-WO3) nanostructures were synthesized by a hydrothermal method at 180 deg C using sodium tungstate, ethylenediaminetetraacetic (EDTA) salts of sodium or ammonium, and sodium sulfate. Controlled morphological modification of h-WO3 nanowire bundles was achieved and hierarchical urchin-like structures were produced by simply substituting the sodium ions with ammonium ions in the EDTA salt solution. Self-assembled h-WO3 nanowire bundles and nanorods that formed urchin-like structures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. 1D self-assembled h-WO3 nanowire bundles of 100 nm diameter and 1-2 mum length were comprised of several individual uniform nanowires of 4-6 nm diameter. These individual nanowires served as building blocks of the bundles. Raman, cyclic voltammetry (CV), and photoluminescence (PL) spectroscopy studies revealed their structure, electrochemical response, and luminescence properties. The synthesis of 1D self-assembled h-WO3 nanowire bundles and urchin-like structures was differentiated by means of Na+- and NH4+-based EDTA salt solutions. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2008.07.048 |