Time filter

Source Type

Martinez-Tomas M.C.,University of Valencia | Montenegro D.N.,University of Valencia | Sallet V.,Groupe dEtude de la Matiere Condensee GEMAC | Muoz-Sanjose V.,University of Valencia
Journal of Applied Physics | Year: 2012

We present a systematic high-resolution x-ray diffraction (HRXRD) methodology for the analysis of one-dimensional nanostructures, in order to give answer to some of the frequently found problems in the literature. Regarding the assessment of structural properties, it is well known that high resolution x-ray diffraction measurements can provide qualitative and quantitative information on several intrinsic parameters of the material. However when nanostructures are present, the difficulties in analyzing the diffracted signals coming from nanostructures and the homolayer on which they usually grow have led to a reduced use of this technique, one of the most powerful methods for structural analysis. The aim of this paper is to develop a methodology for the analysis of one-dimensional structures based on the mosaic model similar to the one used in the x-ray diffraction methods for layers and films. On this basis, it has been possible by making a careful and systematic application of HRXRD to obtain separated structural information of nanostructures and the layer/block/grain underneath. In addition, the existence of a long-range ordering of nanostructures has been studied from the detection and analysis of forbidden reflections. The HRXRD experimental work has been particularized on ZnO nanorods grown by catalyst-free metal organic chemical deposition on c-sapphire substrates. © 2012 American Institute of Physics.

Montenegro D.N.,University of Valencia | Hortelano V.,University of Valladolid | Martinez O.,University of Valladolid | Martinez-Tomas M.C.,University of Valencia | And 3 more authors.
Journal of Physics D: Applied Physics | Year: 2013

We have investigated the cathodoluminescence (CL) emission and the Raman spectra along individual ZnO nanorods grown by a catalyst-free method. The spatial correlation between the CL emission and the defect related Raman modes permits establishing a correspondence between the non-radiative recombination centres (NRRCs) and the defects responsible for the 275 cm-1 Raman band. According to this relation, the NRRCs in these nanorods are tentatively associated with complexes of zinc interstitials. © 2013 IOP Publishing Ltd.

Discover hidden collaborations