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Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

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Friction 2017年第4期5卷 402-413页

作者： Bolutife OLOFINJANA Uchenna Sydney MBAMARA Oyelayo ajayi Cinta LORENZO-MARTIN Eusebius Ikechukwu OBIAJUUWA ezekiel oladele bolarinwa ajayi Department of Physics and Engineering Physics Obafemi Awolowo UniversityIle-Ife 220005NigeriaTribology SectionEnergy System DivisionArgonne National LaboratoryArgonneIL 60439USA Department of Physics Federal University of TechnologyOwerriNigeria Tribology Section Energy System DivisionArgonne National LaboratoryArgonneIL 60439USA Center for Energy Research and Development Obafemi Awolowo UniversityIle-Ife 220005Nigeria Department of Physics and Engineering Physics Obafemi Awolowo UniversityIle-Ife 220005Nigeria

N-doped ZnO thin films were deposited on 304L stainless steel through the pyrolysis of zinc acetate and ammonium acetate in different ratios at a temperature of 420 ℃ using metal organic chemical vapor *** and structural analyzes of the films were performed by using Rutherford backscattering spectroscopy and X-ray *** frictional behavior of the thin films and 304L stainless steel substrate was evaluated using a ball-on-flat configuration with reciprocating sliding under marginally lubricated and fully flooded *** alloy (2017) was used as ball counterface,while basestock synthetic polyalfaolefin oil (PAO10) without additives was used as *** flat and ball counterface surfaces were examined to assess the wear dimension and failure *** marginally lubricated condition,N-doped ZnO thin films provided significant reduction in friction,whereas the films have minimal or no effect in friction under fully flooded condition.N-doped ZnO thin films showed a significant effect in protecting the ball counterface as wear volume was reduced compared with that of the substrate under the marginally lubricated *** the fully flooded condition,with the exception of one of the films,the wear volume of the N-doped ZnO thin films ball reduced compared with that of the *** all the ball counterfaces for N-doped ZnO thin films under both conditions,wear occurred through abrasive mechanism of various degrees or mild ***,superfluous lubrication of N-doped ZnO thin films is not necessary to reduce friction and wear.

关键词： ZnO film metal organic chemical vapor deposition friction wear optical microscopy

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Characterization of High Yield Graphene Oxide Synthesized by Simplified Hummers Method

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Graphene 2017年第4期6卷 85-98页

作者： Kayode oladele Olumurewa Bolutife Olofinjana Oladepo Fasakin Marcus Adebola Eleruja ezekiel oladele bolarinwa ajayi Department of Physics and Engineering Physics Obafemi Awolowo University Ile-Ife Nigeria

Graphene oxide (GO) was chemically synthesized from natural flake graphite (NFG) using the simplified Hummers method. The synthesis was carried out using two routes. The first route involved stirring the one pot mixture continuously for three days at ambient temperature while the second route involved stirring another one pot mixture for six days also at ambient temperature. The two GOs were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-Ray Spectroscopy (EDX), Field Emission Scanning Electron Microscopy (FE-SEM), Raman Spectroscopy and UV-Visible Spectrometry. The FTIR spectra showed introduction of oxygen functionalities in both GO with a higher degree of oxidation in the 6-day synthesized GO while the EDX confirmed the presence of carbon and oxygen in the GOs. The SEM micrograph gave the typical wrinkle and crumpling present in the 3-day synthesized GO while the 6-day synthesized GO showed distortion in structures. The Raman spectra showed a slightly higher ID/IG ratio for the 3-day synthesized GO with the 6-day synthesized GO showing a greater disruption of the sp2 domains. The extended period of stirring and oxidation increased the band gap of the 6-day synthesized GO to 3.0 eV unlike the 3-day synthesized GO where 2.5 eV was observed.

关键词： Graphite Graphene Graphene Oxide Raman Spectroscopy Band Gap

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Synthesis and Characterization of CdS, ZnS and CdZnS Nanoparticles Embedded in Polystyrene

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Journal of Modern Physics 2014年第5期5卷 257-266页

作者： Olumide Oluwole Akinwunmi Gabriel O. Egharevba ezekiel oladele bolarinwa ajayi Department of Chemistry Obafemi Awolowo University Ile-Ife Nigeria Department of Physics Obafemi Awolowo University Ile-Ife Nigeria

The nano dispersions (colloids) of Cadmium Sulfide, Zinc Sulfide and Cadmium Zinc Sulfide were prepared by modified metathesis reaction between CdCl2, ZnCl2 and Na2S. The prepared sulfides were embedded in polystyrene to form nano-composites. The size, morphology and composition of the nanoparticles on the surface of the composites were examined by using UV/VIS Spectroscopy, Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM), Energy Dispersive Spectroscopy (EDS) and Particle Induced X-ray Emission (PIXE). The UV-spectrum shows a shift in the band gap towards high energy while the High Resolution Transmission Electron Microscope (HRTEM) analysis shows well resolved nanoparticles with particle sizes between 2-10 nm. The SEM shows that the nanoparticles are in form of nano clusters. The blue shift of the absorption band makes it possible to evaluate the size of the nanocrystallites, which is in agreement with that obtained from HRTEM. The composition as revealed by the EDS shows that the ratios of Cd:S, Zn:S and Cd:Zn:S are approximately 23:20, 58:42 and 32:35:33, respectively. The PIXE spectra confirmed the presence of expected elements and also reveal the presence of impurities.

关键词： Nano-Particle Nano-Composite

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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

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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)

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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

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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

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MOCVD of Molybdenum Sulphide Thin Film Via Single Solid Source Precursor Bis-(Morpholinodithioato-s,s’)-Mo

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Journal of Modern Physics 2011年第5期2卷 341-349页

作者： Bolutife Olofinjana Gabriel Egharevba Bidini Taleatu Olumide Akinwunmi ezekiel oladele ajayi 不详

A single solid source precursor bis-(morpholinodithioato-s,s’)-Mo was prepared and molybdenum sulphide thin film was deposited on sodalime glass using Metal Organic Chemical Vapour Deposition (MOCVD) technique at deposition temperature of 420?C. The film was characterized using Rutherford Backscattering Spectroscopy (RBS), Ultraviolet-Visible Spectroscopy, Four point probe technique, Scanning Electron Mi-croscopy (SEM), X-ray Diffractometry (XRD) and Atomic Force Microscopy (AFM). A direct optical band gap of 1.77 eV was obtained from the analysis of the absorption spectrum. The sheet resistance was found to be of the order of 10P–5P ΩP–1P?cmP–1P. SEM micrographs of the films showed the layered structure of the film with an estimated grain size that is less than 2 μm while XRD indicates parallel orientation of the basal plane to the substrate surface.

关键词： Molybdenum Sulphide Precursor Metal Organic Chemical Vapour Deposition (MOCVD) Thin Film Characterization

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Doxycycline Ameliorates Schizophrenia-Like Behaviors in Experimental Models in Mice by Targeting Underlying Oxidative Stress

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Journal of Behavioral and Brain Science 2016年第13期6卷 539-562页

作者： Benneth Ben-Azu Itivere Adrian Omogbiya Adegbuyi oladele Aderibigbe Solomon Umukoro Abayomi Mayowa ajayi Aya-Ebi Okubo Eneni ezekiel O. Iwalewa Department of Pharmacology and Therapeutics College of Medicine University of Ibadan Ibadan Nigeria Department of Pharmacology and Therapeutics Faculty of Basic Medical Sciences Delta State University Abraka Nigeria

Current evidences support the inhibition of oxidative and inflammatory signaling mechanisms in the treatment of schizophrenia;as cure for this disease still remains limited. Doxycycline is a tetracycline antibiotic (a minocycline congener) with strong antioxidant and anti-inflammatory properties, and better pharmacokinetic profiles. Preclinical evidence indicates that minocycline possesses antipsychotic properties. This present study was designed to evaluate the effect of doxycycline on schizophrenia-like behaviors, as well as biomarkers of oxidative stress in mice brains. Novelty-induced rearing (NIR) behavior was used to evaluate the tranquilizing effect of doxycycline (25 - 200 mg/kg). The acute antipsychotic effects of doxycycline were assessed using apomorphine-induced stereotypy, ketamine-induced stereotypy, hyperlocomotion and enhanced immobility in forced swim test (FST). Catalepsy test was also employed to evaluate the extrapyramidal adverse effect of doxycycline in mice. The chronic antipsychotic effect of doxycycline was evaluated following oral administration of doxycycline in combination with ketamine (100 mg/kg) intraperitoneally for 10 days. Twenty four hours after the last administration, positive (locomotor activity), cognitive (Y-maze) and negative (FST) symptoms were assessed. Thereafter, levels of biomarkers of oxidative stress were evaluated in mice brains. Doxycycline significantly (P P P < 0.05) prevented the decrease in glutathione, and increased activities of superoxide dismutase and catalase in brain tissues. The results from this study suggest that doxycycline ameliorated schizophrenic-like behaviors via mechanisms related to attenuation of oxidative stress in mouse brain.

关键词： Schizophrenia Antipsychotics Oxidative Stress Antioxidant Doxycycline

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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

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