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Synthesis and Characterization of Metal Organic Chemical Vapour Deposited Chromium Doped Zinc Oxide Thin Film for Gas Sensing Applications

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Materials Sciences and Applications 2018年第10期9卷 844-857页

作者： olumide oluwole akinwunmi Olakunle A. Akinwumi Johnson Ayodele O. Ogundeji Adetokunbo Temitope Famojuro Department of Physics and Engineering Physics Obafemi Awolowo University Ile-Ife Nigeria Department of Chemistry Obafemi Awolowo University Ile-Ife Nigeria

Chromium (Cr) doped Zinc oxide ZnO thin films were deposited onto glass substrates by Metal Organic Chemical Vapour Deposition (MOCVD) technique with varying dopant concentration at a temperature of 420°C. The effect of the chromium concentration on morphological, structural, optical, electrical and gas sensing properties of the films were investigated. The scanning electron microscopy results revealed that the Cr concentration has great influence on the crystallinity, surface smoothness and grain size. X-ray diffraction (XRD) studies shows that films were polycrystalline in nature and grown as a hexagonal wurtzite structure. A direct optical band energy gap of 3.32 to 3.10 eV was obtained from the optical measurements. The transmission was found to decrease with increasing Cr doping concentration. Rutherford Backscattering Spectroscopy (RBS) analysis also demonstrates that Cr ions are substitutionally incorporated into ZnO. I-V characteristic of the film shows a resistivity ranges from 1.134 × 10-2 · cm to 1.24 × 10-2 · cm at room temperature. The gas sensing response of the films were enhanced with incorporation of Cr as a dopant with optimum operating temperature around 200°C.

关键词： Zinc Oxide Thin Films Metal Organic Chemical Vapour Deposition Gas Sensors

Effect of Deposition Temperature on Some Properties of MOCVD Molybdenum Sulphide Thin Films

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材料科学与工程（中英文B版） 2014年第4期4卷 78-85页

作者： Bolutife Olofinjana Gabriel Osaze Egharevba Bidini Alade Taleatu olumide oluwole akinwunmi Ezekiel Oladele Bolarinwa Ajayi Department of Physics Obafemi Awolowo University Ile-lfe Nigeria Department of Chemistry Obafemi Awolowo University lle-Ife Nigeria

Synthesis and Characterization of Metal Organic Chemical Vapour Deposited Copper Titanium Oxide (Cu-Ti-O) Thin Films from Single Solid Source Precursor

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Journal of Modern Physics 2013年第12期4卷 1-6页

作者： Oladepo Fasakin Marcus Adebola Eleruja olumide oluwole akinwunmi Bolutife Olofinjana Emmanuel Ajenifuja Ezekiel Oladele Bolarinwa Ajayi Centre for Energy Research and Development Obafemi Awolowo University Ile-Ife Nigeria Department of Physics Obafemi Awolowo University Ile-Ife Nigeria

Thin films of copper titanium oxide were deposited by metal organic chemical vapour deposition technique from the synthesized single solid source precursor, copper titanium acetylacatonate Cu [Ti(C5H7O2)3] at the deposition temperature of 420°C. The deposited films were characterized using Rutherford Backscattering Spectroscopy, Scanning Electron Microscopy with Energy Dispersive X-Ray facility attached to it, X-Ray Diffractometry, UV-Visible Spectrometry and van-der Pauw Conductivity measurement. Results show that the thickness of the prepared film is determined as 101.236 nm and the film is amorphous in structure, having average grain size of approximately 1 μm. The optical behaviour showed that the absorption edge of the film was at 918 nm near infrared with corresponding direct energy band gap of 1.35 eV. The electrical characterization of the film gave the values of resistivity, sheet resistance and conductivity of the film as 3.43 × 10-1 Ω-cm, 3.39 × 106 Ω/square and 2.91 (Ω-cm)-1 respectively.

关键词： Thin Film Copper Titanium Oxide Metalorganic Chemical Vapour Deposition (MOCVD)

Characterisation of Zinc Oxynitride Thin Films Prepared Using Zinc(II) Complex of Hexamethylenetetramine as the Precursor

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Materials Sciences and Applications 2022年第8期13卷 479-489页

作者： olumide oluwole akinwunmi Oluwaseun Philip Adelabu Adetokunbo Temitope Famojuro Olakunle A. Akinwumi Priscilla Oluwatumilara Olaopa Kehinde Folorunso Olafisan Ezekiel Oladele Bolarinwa Ajayi Department of Physics and Engineering Physics Obafemi Awolowo University Ile-Ife Nigeria Department of Chemistry Obafemi Awolowo University Ile-Ife Nigeria

A Zinc(II) complex of hexamethylenetetramine was prepared as a single source precursor and used to deposit zinc oxynitride thin films. The thin films were deposited on soda-lime glass substrates using the Metal Organic Chemical Vapour Deposition (MOCVD) technique at the deposition temperature of 370°C and 390°C, respectively. The Fourier Transform Infrared Spectroscopy (FTIR) was used to determine the functional groups in the precursor, with stretching frequency for O-H, N-H, and C-H observed. The deposited films were characterized using UV-Visible Spectroscopy, Scanning Electron Microscopy (SEM), Elemental diffraction X-ray (EDX), and X-ray Diffractometer (XRD). A direct bandgap of 3.15 eV and 3.18 eV was obtained from the film deposited at 370°C and 390°C, respectively, using the Envelope Method. In comparison, a bandgap of 3.19 eV and 3.21 eV was obtained using the absorption spectrum fitting (ASF) method. The SEM revealed that the film is homogeneous, dense, and compact, composed of cluster grains. The EDX confirmed the presence of Zinc, Nitrogen and Oxygen. The X-ray Diffraction indicated the polycrystalline nature of the film.

关键词： Zinc Oxynitride Metal Organic Chemical Vapour Deposition (MOCVD) Precursor Characterisation Thin Film

Preparation and Some Properties of Metal Organic Chemical Vapour Deposited Al-Doped ZnO Thin Films Using Single Solid Precursors

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Journal of Modern Physics 2018年第11期9卷 2073-2089页

作者： olumide oluwole akinwunmi Johnson Ayodele O. Ogundeji Adetokunbo Temitope Famojuro Olakunle A. Akinwumi Olusoji O. Ilori Olatomide G. Fadodun Ezekiel Oladele Bolarinwa Ajayi Department of Physics and Engineering Physics Obafemi Awolowo University Ile-Ife Nigeria Department of Chemistry Obafemi Awolowo University Ile-Ife Nigeria Department of Electrical and Electronic Obafemi Awolowo University Ile-Ife Nigeria Centre for Energy Research and development Obafemi Awolowo University Ile-Ife Nigeria

Zinc Oxide (ZnO) and Aluminium doped ZnO (AZO) thin films were deposited on soda lime glass by Metal Organic Chemical Vapour deposition technique (MOCVD), using prepared compound mixtures of Zinc Acetate di-hydrate (Zn(CH3COO)2⋅2H2O;ZAD) and Aluminium Acetyl-Acetonate (Al(C5H702)3;AAA) precursors at a temperature of 420°C. Effects of the varying mole percent concentrations of AAA precursor additives on the Al dopant concentrations in ZnO were systematically studied. The observations were made via investigations carried out on the morphological, optical, electrical and compositional properties of the deposited thin films. The thin films morphology was found to be strongly dependent on the varying concentration of AAA in the precursor mixtures. The average optical transmittance of the thin films in the uv-visible region was over 85% except 5 mol.% Al. While the energy band gaps were found to be in range of 3.27 - 3.36 eV. There is a blue-shift of the energy band edge observed between 0 and 5 mol.% AAA, which may be due to Burstein-Moss’ band gap widening effect and an opposing band gap renormalization effect at 10 mol.% AAA along with an extra band gap stabilization effect (Roth’s effect) at 15 mol.% AAA in rather quasi-sinusoidal or anomalous behaviour. The optical transmittance and electrical conductivity of ZnO were enhanced with addition of Al dopants. The RBS confirm the presence of Al, Zn and O, and evidence that Al dopants were successfully incorporated into the ZnO.

关键词： ZnO Thin Film ZnO:Al MOCVD Optical Properties AAA ZAD Electrical Properties FESEM UV-Vis Optoelectronic Properties

Some Properties of Manganese Oxide （Mn-O） and Lithium Manganese Oxide （Li-Mn-O） Thin Films Prepared via Metal Organic Chemical Vapor Deposition （MOCVD） Technique

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材料科学与工程（中英文B版） 2015年第5期5卷 231-242页

作者： Kabir O. Oyedotun Marcus Adebola Eleruja Bolutife Olofinjana olumide oluwole akinwunmi Olusoji O.Ilori Ezekiel Omotoso Emmanuel. Ajenifuja Adetokunbo T. Famojuro Eusebius I. Obianjuwa Ezekiel Oladele Bolarlnwa Ajay Department of Physics and Engineering Physics Obafemi Awolowo University lle-Ife 220005 Nigeria Department of Electronic and Electrical Engineering Obafemi Awolowo University Ile-Ife 220005 Nigeria Centre for Energy Research and Development Obafemi Awolowo University Ile-lfe 220005 Nigeria Department of Chemistry Obafemi Awolowo University Ile-Ife 220005 Nigeria

Surface anatomy and prevalence of fibularis tertius muscle in a south-western Nigerian population

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Forensic Medicine and Anatomy Research 2013年第2期1卷 25-29页

作者： James olumide Ashaolu Oluwaseun Iretiolu Olorunyomi oluwole Adebayo Opabunmi Victor Okoliko Ukwenya Magnus Adebo Thomas Department of Anatomy Bowen University Iwo Nigeria Department of Physiology Bowen University Iwo Nigeria

Fibularis tertius is a variant muscle of the leg that inserts in the foot. It has been implicated in providing clues to the evolution of upright posture in man. This work investigates the prevalence of fibularis tertius muscle in the African population, using south-western Nigeria as a sample population. The percentage prevalence of fibularis tertius muscle in the population studied is 63%, with higher prevalence in males compared to females. The muscle was however observed to present itself more on the right limb than on the left. Fifteen percent (15%) of the subjects had fibularis tertius muscle only on the right foot. Six percent (6%) had the muscle on the left foot only, 52% had it on both feet and 27% did not have the muscle on any of their foot. A unique surface positioning of the fibularis ter-tius tendon was also observed in all the subjectsstudied. These findings may provide contributions to the clinical evaluation of the muscle.

关键词： Fibularis Tertius Muscle Variant Muscles Foot