Authors: Lobacheva, Olga; Murphy, Michael W.; Ko, Jun Y.P.; Sham, Tsun-Kong

Source: Canadian Journal of Chemistry, Volume 87, Number 9, September 2009 , pp. 1255-1260(6)

Publisher: NRC Research Press

Abstract:

ZnO nanostructures have been synthesized by thermal evaporation on Si substrates. It is found that the morphologies of the nanostructures are governed by growth conditions such as temperature, carrier-gas flow rate, and the nature of the substrate (with and without a catalyst). We report X-ray excited optical luminescence from ZnO nanostructures of distinctly different morphologies in the energy and time domain using excitation photon energies across the Zn K-edge. X-ray excited optical luminescence (XEOL) and X-ray absorption near edge structure (XANES) study has clearly shown the morphology dependence of the ZnO optical properties. A correlation of luminescence with morphology, size, and crystallinity emerges.

On a synthétisé des nanostructures de ZnO par évaporation thermique de substrats contenant de l'étain. On a trouvé que les morphologies des nanostructures sont gouvernées par les conditions de croissance, la vitesse d'écoulement du gaz porteur et la nature du substrat, avec ou sans catalyseur. Utilisant des énergies photoniques d'excitation sur l'arête K du zinc, on a pu observer de la luminescence optique excitée par les rayons X à partir de nanostructures de ZnO de morphologies comportant des différences importantes dans le domaine du temps et de l'énergie. Des études de luminescence optique excitée par les rayons X « XEOL » et par la spectroscopie de la structure fine d'absorption des rayonsX près du seuil « XANES » ont clairement démontré l'importance de la morphologie sur les propriétés optiques du ZnO. Il en émerge une corrélation entre la luminescence et la morphologie, la taille et la cristallinité.

Document Type: Research article

Publication date: 2009-09-01

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• In this Subject: Chemistry (General) ,  Inorganic Chemistry ,  Organic Chemistry
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