+44-1518-081136Nanostructure of luminescent ZnkIn2Ok+3 materials
International Conference on Nanoscience & Technology
May 21-22, 2018 | New York, USA
Julio Ramirez-Castellanos
Universidad Complutense Madrid, Spain
Posters & Accepted Abstracts : Mater Sci Nanotechnol
Abstract:
Several terms of the homologous series ZnkIn2Ok+3 (3 ≤ k ≤ 13) have been synthesized following solid-state reactions with an exhaustive control of the synthesis parameters. The structure consists of alternated layers of InO2- octahedral and wurtzite-like InZnkOk+1+ blocks stacked perpendicular to the c-axis of the crystal, where zinc and indium occupy tetrahedral and trigonal bipyramid sites. Moreover, the zone axis show a gradual shift of the oxygen position in order to keep the polarization neutrality along c axis and allow the formation and stabilization of the structure, while no differences of the indium distribution inside the wurtzite blocks is visualized). On the other hand, images from zone axis show the characteristic nanostructured zig-zag modulation of this homologous series. Electron energy loss spectroscopy (EELS) confirms the preference site of In3+ along this zig zag pattern. Cathodoluminescence measurements reveal a main emission band centered at 1.75 eV, which shows an increasing of intensity with k, and has been attributed to the existence of zinc vacancies. For this reason, the combined study of structural aspects and physical properties of these oxides, as addressed in this work, is necessary for a proper discussion of the results.
Biography:
Julio Ramirez-Castellanos works in the synthesis and structural/microstructural characterizations of new functional inorganic materials by high-resolution electron microscopy. Currently, he is professor at Complutense University, Madrid. He is coauthor of more than 100 reviewed scientific publications, 4 invention patents, and more than 100 communications to international conferences.
Email: jrcastel@quim.ucm.es
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