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Article Dans Une Revue Superlattices and Microstructures Année : 2017

Structural and magnetic properties of Co-doped ZnO thin films grown by ultrasonic spray pyrolysis method

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Résumé

Cobalt-doped ZnO thin films with several different percentage of Co from 0 up to 15 at% were synthesized via a cheap, simple and versatile method i.e. ultrasonic spray pyrolysis at atmospheric pressure and a substrate temperature of 350 degrees C. The structure of the as prepared samples was characterized by X-ray diffraction (XRD), Raman spectroscopy and FTIR. The Co-doping effect is revealed by the presence of three additional peaks around 235, 470 and 538 cm(-1) respect to the Raman spectra of the unsubstituted film. Fourier transform infrared spectroscopy (FTIR) put in evidence the decrease of the bond force constant f with increasing Co-doping. By ultra-violet visible near infrared (UV-Vis-NIR) spectroscopy on Co-doped samples it was possible to show the presence of additional absorption bands at approximately 570, 620 and 660 nm suggesting that Co2+ ions do not change their oxidation when substituted to zinc and the ZnO lattice does not change its wurtzite structure as well. Finally, all our samples exhibit a paramagnetic behavior without any trace of intrinsic room temperature ferromagnetism. (C) 2016 Elsevier Ltd. All rights reserved.
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Dates et versions

hal-03627243 , version 1 (01-04-2022)

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R. Baghdad, N. Lemee, G. Lamura, A. Zeinert, N. Hadj-Zoubir, et al.. Structural and magnetic properties of Co-doped ZnO thin films grown by ultrasonic spray pyrolysis method. Superlattices and Microstructures, 2017, 104, pp.553-569. ⟨10.1016/j.spmi.2016.11.069⟩. ⟨hal-03627243⟩
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