Preparation and characterization of V2O5 macro-plates

Abstract: V2O5 macro-plates have been prepared using water/ethanol media. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The as-prepared V2O5 plates appear to be an orthorhombic structure, and they seem to be composed of strip-like V2O5 nanocrystals which appear to be parallel or perpendicular to each other. The band gap of the V2O5 macro-plates calculated from the optical absorption edge is about 3.4 eV, showing a strong blue shift compared to bulk V2O5. It is also found that the final shape of the V2O5 macro-plates strongly depends on the reaction conditions. The possible formation mechanism of the V2O5 macro-plates is discussed. [Copyright &y& Elsevier]