Journal
PHYSICA B-CONDENSED MATTER
Volume 403, Issue 10-11, Pages 1770-1774Publisher
ELSEVIER
DOI: 10.1016/j.physb.2007.10.069
Keywords
zinc oxide; nanoparticles; photoluminescence; sol-gel; optical materials
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We report the elaboration of vanadium-doped ZnO nanoparticles prepared by a sol-gel processing technique. In our approach, the water for hydrolysis was slowly released by esterification reaction followed by a supercritical drying in ethyl alcohol. Vanadium doping concentration of 10 at% has been investigated. The obtained nanopowder was characterised by various techniques such as particle size analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and photoluminescence (PL). In the as-prepared state, the powder with an average particle size of 25 nm presents a strong luminescence band in the visible range after thermal treatment at 500 degrees C in air. The energy position of the obtained PL band depends on the wavelength excitation and presents a blue shift with measurement temperature increase. Different possible attributions of this emission band will be discussed. (c) 2007 Elsevier B.V. All rights reserved.
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