Characterization and Sensing of Doped Cerium Oxide Thin Film for toxic Gases
Researcher name: Mustafa Muthana Rasheed
Signature:
Name: Dr. Bushra abbas Hasan
Title : Professor
Abstract
This work is interested in investigation the effect of doping in various ratios (0%, 3%, 5%, 7%, and 9%) with selected oxides name (Eu2O3) and (In2O3) oxides on the commonalty properties of CeO2 which imply that the microstructural , optical , electrical properties and eventually try to fabricate gas sensors to detect various of gases . To study these properties, several techniques have been employed to conduct structural, compositional, optical and electrical measurements, such as X-ray diffraction, Fourier transform infrared spectroscopy, Hall effect as well as A.C conductivity measurements as function of frequency in the range (50Hz- 200 kHz). First, various compounds were synthesizes from Erbium and Indium Oxides doped Cerium Oxide in rang of ratios (0%, 3%, 5%, 7%, and 9%), then put the appropriate weight of the materials in an quartz ampule the evacuated at 10-2 Toor. The ampules were heated to 1273K and left at this temperature for 5 hours. The obtained materials were grinded to increase homogeneity and pressed in pellet shapes to be the targets for laser ablation. Thin films with thickness of ≈ 150 nm were deposited on different substrates such as glass and single crystal of silicon n and p type using pulsed laser deposition method. The results of structural analysis show that Erbium and Indium doped cerium oxide are polycrystalline with cubic phase. The crystallte size was found to grow up from 20.5 to 32.15nm when Eu2O3 ratio increases from 0% to 7% and then drop down to 28.46 nm with further increase of Eu2O3 ratio while increasing of indium oxide doping ratio lead to proceeding increase of the crystal size from 20.5 to 21.42 nm , while the lattice constant measured for cubic CeO2 get to change in opposite to that.
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A master’s thesis is discussed in College of science, University of Baghdad, about the biostratigraphy and depositional environmental of Yamama formation in Faihaa oil field southern Iraq
In the College of science, University of Baghdad, a master’s thesis was discussed, tagged “Biostratigraphy and Depositional Environmental of Yamama Formation in Faihaa Oil Field Southern Iraq” by the research student Maryam Mohammad Taha and presented to the Geology Department under the supervision by Dr. Salam I.
