Deposition of Cobalt Doped Zinc Oxide Thin Film Nano-Composites Via Pulsed Electron Beam Ablation
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Deposition of Cobalt Doped Zinc Oxide Thin Film Nano-Composites Via Pulsed Electron Beam Ablation Asghar Ali, Patrick Morrow, Redhouane Henda and Ragnar Fagerberg MRS Advances / Volume 1 / Issue 06 / January 2016, pp 433 - 439 DOI: 10.1557/adv.2016.44, Published online: 19 January 2016
Link to this article: http://journals.cambridge.org/abstract_S205985211600044X How to cite this article: Asghar Ali, Patrick Morrow, Redhouane Henda and Ragnar Fagerberg (2016). Deposition of Cobalt Doped Zinc Oxide Thin Film Nano-Composites Via Pulsed Electron Beam Ablation. MRS Advances, 1, pp 433-439 doi:10.1557/adv.2016.44 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.44
Deposition of Cobalt Doped Zinc Oxide Thin Film Nano-Composites Via Pulsed Electron Beam Ablation Asghar Ali 1, Patrick Morrow 2, Redhouane Henda 1 and Ragnar Fagerberg 3 1 2 Bharti School of Engineering, Laurentian University, Sudbury, ON. Canada; Department of Physics, University of Guelph ON. Canada; 3SINTEF Materials and Chemistry, department of materials and nano technology, Trondheim, Norway. Abstract This study reports on the preparation of cobalt doped zinc oxide (Co:ZnO) films via pulsed electron beam ablation (PEBA) from a single target containing 20 w% Co on sapphire (0001) and silicon (100) substrates. The films have been deposited at various temperatures (350оC, 400оC, 450оC) and pulse frequencies (2 Hz, 4 Hz), under a background argon (Ar) pressure of about 3 mtorr, and an accelerating voltage of 14 kV. The surface morphology has been examined by atomic force microscopy (AFM) and scanning electron microscopy (SEM). According to SEM analysis, the films consist of nano-globules whose size is in the range of 80-178 nm. Energy dispersive x-ray spectroscopy (EDX) reveals that deposition is congruent and the prepared films contain ~20±5 w% cobalt. It has been found that the nano-globules in the deposited films are cobalt-rich zones containing ~70 w% Co. From x-ray photoelectron spectroscopy (XPS) analysis, Co 2p3/2 peaks indicate that the deposited films contain CoO (binding energy = 780.5 eV) as well as metallic Co (binding energy = 778.1-778.5 eV). X-ray diffraction (XRD) analysis supports the presence of metallic Co hcp phase (2ϴ = 44.47˚ and 47.43˚) in the films. Keywords: Co:ZnO nano-composites, pulsed electron beam ablation, model catalyst. Introduction Zinc oxide is a semiconductor whose properties make it an attractive material for potential applications in microelectronics, optoelectronics, and laser technology. Upon alloying with Co and other transition metals, ZnO exhibits room temperature ferromagnetic properties with enhanced functionalities when used in thin film devices. Zinc oxide-supported cobalt nanocomposites are important materials with excellent catalytic propertie
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