Abstract
Tungsten oxide nanorods were prepared fromW2N film by a simpleannealing method. W2N film was deposited on a Si(100) substrate by chemical vapour deposition (CVD) at450 °C, and then heatingof the film at 600–700 °C produces a high density of tungsten oxide nanorods. The morphology, structure, compositionand chemical binding states of the prepared nanorods were characterized by scanning electronmicroscopy (SEM), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), energydispersive x-ray analysis (EDX) and transmission electron microscopy (TEM) measurements.XRD and TEM analysis showed that the grown nanorods were single-crystallineW18O49. According toXPS analysis, the W18O49 nanorods contained ∼62% of W6+,∼28% ofW5+,and ∼10% of W4+. Field-emission measurements showed a low turn-on field of9.5 V µm−1 forthe W18O49 nanorods, indicating that they can be used as potential field emitters. Also, a synthesis reactionmechanism based on thermodynamics is proposed for the growth of tungsten oxide nanorods fromW2N.
Published Version
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