Glycothermal synthesis of assembled vanadium oxide nanostructures for gas sensing

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Journal Article
Journal of Nanoparticle Research, 2012, 14 (6)
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This study demonstrates a facile but effective glycothermal method to synthesize vanadium oxide nanostructures for gas sensing detection. In this method, sodium orthovanadate was first dispersed and heated in ethylene glycol at 120-180 °C for a few hours, and then the precipitates were collected, rinsed, and sintered at high temperatures (e.g., 600°C) for V 2O 5 in air and V 2O 3 in nitrogen, respectively. The as-prepared vanadium oxide particles are nanorods (200 nm × 1 μm) and can assemble into microspheres or urchin-like structures with a diameter of ~3 μm. The experimental parameters (temperature, time, and surfactants) and the formation mechanisms were investigated by various advanced techniques, such as transmission electron microscope, scanning electron microscope, X-ray diffraction, Fourier transform infrared spectroscopy, and thermo-gravimetric analysis. Finally, the V 2O 5 nanoparticles were tested for sensing detection of gas species of acetone, isopropanol, and ammonia. The microurchin structures show higher sensing performance than the nanorods. Graphical Abstract: [Figure not available: see fulltext.] © 2012 Springer Science+Business Media B.V.
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