Abstract
Vanadium carbide (V8C7) nanopowders were prepared through simultaneous thermal decomposition and carbothermal reduction of the precursor VOC2O4/sucrose in vacuum. The products were characterized by X-ray diffractometer (XRD) and transmission electron microscopy (TEM) techniques. The thermolysis process of the precursor has been investigated by themogravimetric analysis and differential thermal analysis (TG-DSC). The results showed that the pure V8C7 powders can be obtained at 950°C for 30min and the particle size is in the range from 30 to 50nm with good dispersion. The effects of experimental parameters and reaction mechanism have been explored. The lower synthesis temperature and shorter reaction time were attributed to take the quadrivalence vanadium as a reactant, as well as carbon source and vanadium source intimate contact in the precursor. This facile and quickly synthetic strategy may open a new route to the preparation of other carbide nanomaterials.
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