Hydrothermal synthesis and characterization of self-assembled h-WO3 nanowires/nanorods using EDTA salts

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One-dimensional (1D) self-assembled single-crystalline hexagonal tungsten oxide (h-WO3) nanostructures were synthesized by a hydrothermal method at 180 degrees 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 similar to 100 nm diameter and 1-2 mu m 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. (C) 2008 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2009-05
Language
English
Article Type
Article
Keywords

TUNGSTEN-OXIDE NANOWIRES; OPTICAL-PROPERTIES; W18O49 NANORODS; WO3 FILMS; NANOPARTICLES; PHOTOCHROMISM; LUMINESCENCE; NANOTUBES; ROUTE

Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.475, no.1-2, pp.446 - 451

ISSN
0925-8388
DOI
10.1016/j.jallcom.2008.07.048
URI
http://hdl.handle.net/10203/19829
Appears in Collection
MS-Journal Papers(저널논문)
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