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Optical Properties of Zinc Oxide Nanoparticles and Nanorods Synthesized Using an Organometallic Method

The emission properties of nanocrystalline ZnO particles prepared following an organometallic synthetic method are investigated. Spherical particles and nanorods are studied. The shape of the particles and the ligands used are shown to influence the luminescence properties in the visible domain. Two...

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Bibliographic Details
Published in:Chemphyschem 2006-11, Vol.7 (11), p.2392-2397
Main Authors: Kahn, Myrtil L., Cardinal, Thierry, Bousquet, Bruno, Monge, Miguel, Jubera, Véronique, Chaudret, Bruno
Format: Article
Language:English
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Summary:The emission properties of nanocrystalline ZnO particles prepared following an organometallic synthetic method are investigated. Spherical particles and nanorods are studied. The shape of the particles and the ligands used are shown to influence the luminescence properties in the visible domain. Two different emissions are observed at 440 nm (≈2.82 eV) and at 580 nm (≈2.14 eV) that are associated with the presence of surface defects on the particles. The first emission corresponds to the well‐known yellow emission located at 580 nm (≈2.14 eV) with a lifetime of 1850 ns for 4.0 nm size ZnO nanoparticles. The second emission at 440 nm (≈2.82 eV) is observed when amine functions are present. This strong blue emission is associated with an excitation energy less than that associated with the yellow emission displaying a lifetime of nine nanoseconds. A possible hole trapping effect by the amine groups on the surface of the ZnO particles is discussed as the origin of this emission. The modification of the intensities between the two visible emissions for different particle shapes is proposed to be related to a specific location of the amine ligands on the surface of the particles. The emission properties of nanocrystalline ZnO nanoparticles (see picture) and nanorods prepared by an organometallic synthetic method are investigated. The particle shape and ligands influence the luminescence properties in the visible domain. The localization of the amine ligand along the c crystallographic axis of the ZnO nanoparticles points out the important role of the ligands for the anisotropic growth of nano‐objects.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.200600184