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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:29 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Solid State Physics and Materials Science
Title:
Study of some properties of zinc oxide nanostructures
Authors:
Angel Buruiana (1), Lucian Ion (1), Constantin Logofatu (3), Ciceron Berbecaru (1,2)
Affiliation:
1) Faculty of Physics, University of Bucharest, Atomistilor 405, Magurele, Ilfov, Romania
2) Romanian Materials Science - Crystal Growth Society, 077125 Bucharest, Romania
3)National Institute of Materials Physics, Atomistilor, 405A , PO Box MG 7, 077125, Magurele, Romania
E-mail
angel.buruiana@yahoo.com, lucian.ion@g.unibuc.ro, constantinlogofatu@yahoo.com, berbecaru2ciceron@yahoo.com
Keywords:
tetrapod ZnO, structural analysis, reflectance spectroscopy, electrical parameters
Abstract:
One of the simplest ways to obtain a tetrapodic morphology of the ZnO is the Zn vapors oxidation in an oxygen controlled atmosphere. The wurtzitic structure of the as obtained ZnO, with tetrapodic morphology is supposed to originate from a derived tetrahedral or octahedral (eight triangular piramids) form of the growth seed, obtained from the Zn blende like structure of the nanometric ZnO. The wurtzitic structure of our ZnO samples was confirmed by the X-ray diffraction (XRD) analysis, the calculated structural parameters being close to the data presented on similar structures in the literature. X-ray photoelectron spectroscopy investigations identified the surface chemical composition and confirmed a good stoichiometry of the samples surface in line with XRD analysis for volume and also some adsorbed chemical species were identified. Reflectance spectrum was used to calculate the band gap of the tetrapodic ZnO nanostructures the found values being lower than that for bulk ZnO. Electrical parameters (permittivity and losses) were investigated at room temperature. The high values of the permittivity and dielectric losses suggest important contributions from space charge, structural defects and adsorbed species on the samples surface. A possible transport mechanism could be related to the hopping of charge carriers from one tetrapod to another through their separation interfaces.
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