Okoli Nonso L.

Legacy University Okija · Physics and Electronics

We studied the physical properties of some commercially available wood in Nigeria. The wood samples include Gmelina, Mahogany (Khayalvorensis), Black Oak, Iroko (Melicea Excels), Afara, Bamboo (Bambusoideae), Achi, Bitterkola, Ubia and Mba. The wood sample were initially machined and trimmed to about in width and about thickness. The wood samples w...

In this work, effects of annealing temperature on the optical, structural, morphological, and compositional properties of SILAR deposited copper manganese oxide thin films were determined. Mixture of copper (II) chloride and manganese (II) chloride complexed ammonium hydroxide solution was used as precursor for cations. Sodium hydroxide placed in a...

In this work, superlattice thin films of CdSe/ZnSe were fabricated on a non-conductive glass substrate using the successive ionic layer adsorption reaction (SILAR) method to investigate their properties for possible optoelectronic applications. The SILAR process involved a total cycle time of 100 seconds for a complete SILAR cycle with a total of 1...

Semiconductor thin films of CuMnS have been deposited onto conductive fluorine-doped tin oxide (FTO) glass substrate using an electrodeposition method to investigate their properties for possible applications. Copper sulfate, manganese sulfate and Thiourea were precursors used for sources of copper, manganese and sulphur ions respectively. The conc...

Poly -o- phenylenediamine (PoPD) was deposited as thin films on fluorine doped tin oxide (FTO) conducting substrates by electropolymerization technique using two electrodes at varying acidic pH values of the reaction medium. Dihydrogen sodium phosphate and disodium hydrogen phosphate were used for the preparation of phosphate buffer solution. pH va...

Optical properties of semiconductor thin film alloys of cadmium manganese sulfide (CdMnS) deposited on fluorine-doped tin oxide (FTO) using an electrodeposition method is investigated for their possible optoelectronic device applications in this work. Cadmium sulphate, manganese sulphate and thiourea were starting materials used to source for sourc...

Undoped and cobalt doped copper selenide thin films have been successfully prepared unto fluorine tin oxide (FTO) substrates by electrodeposition method using copper acetate, cobalt nitrate and selenium (IV) oxide as precursors for copper, cobalt and selenium ions respectively. Deposited thin films were subjected to optical, structural, morphologic...

The properties of PbMnS semiconductor thin films deposited on fluorine-doped tin oxide (FTO) substrate using an electrodeposition method are investigated to determine their possible device applications. Lead acetate, manganese sulfate, and thiourea were used as precursors for sources of lead, manganese, and sulfur ions respectively. The concentrati...

Semiconductor thin films of lead manganese sulphide (PbMnS) have been successfully deposited on florinated tin oxide (FTO) conductive glass substrate using an electrodeposition method. Lead acetate (Pb(CH3COO)2), manganese sulphate (MnSO4.H2O) and thiourea (CH4N2S) were the precursor used for lead (Pb 2+), manganese (Mn 2+) and sulphur (S 2-) sourc...

Time optimized cobalt-doped zinc selenide thin films have been successfully electrodeposited on fluorine-doped tin oxide substrates. The films were deposited at the varying time of 1 min, 3 mins, and 5 mins respectively. Film thickness, optical, structural, electrical, and morphological properties of the deposited thin films were evaluated. Film th...

Semiconductor thin films of lead manganese sulphide (PbMnS) have been successfully deposited on conductive fluorine-doped tin oxide (FTO) glass substrate using an electrodeposition method. Lead acetate (Pb(CH 3 COO) 2) Manganese sulphate (MnSO 4 .H 2 O) and Thiourea (CH 4 N 2 S) were the starting materials used for sources of lead (Pb), manganese (...

The study of optical and solid-state properties of semiconductor thin films of CuMnS that can be used for optoelectronic applications have been carried out. Before the study, the films were synthesized on conductive fluorine-doped tin oxide (FTO) glass substrate by optimizing deposition voltage using an electrodeposition method. Copper sulphate, Ma...

Cobalt Selenide thin films were fabricated using Successive Ionic Layer Adsorption and Reaction (SILAR) deposition technique at different SILAR cycles. The precursors for Cobalt and Selenium ions were CoCl2.6H2O and Na2SeSO3 respectively. Optical properties and thickness of the deposited films were studied to determine the effect of number of SILAR...

Chalcogenide thin film semiconductors of cadmium manganese sulphide (CdMnS) have been successfully deposited on conductive florine doped tin oxide (FTO) glass substrate using an electrodeposition technique. Cadmium sulphate (CdSO 4 .H 2 O), Manganese sulphate (MnSO 4 .H 2 O) and Thiourea (CH 4 N 2 S) were precursors used for sources of cadmium (Cd)...

The electrodeposition of Manganese doped Cadmuim Oxide (CdMnO2) thin films on conducting Indium Tin Oxide (ITO) glass was done successfully at room temperature of 302 K at varying time of deposition. The grown films were subjected to optical, crystal structure surface structural and compositional characterization to determine their properties and p...

Superlattices of ZnO/MgO was successfully synthesized on Fluorine doped Tin Oxide (FTO) glass substrates by electrodeposition method. Structural analysis ZnO/MgO was achieved by way of X-ray diffractometry method. Scanning Electron Microscopy (SEM) at 10000 Magnification was used for the morphological studies. Time of deposition was varied for the...

This work presents the successful deposition of Lead Silver Sulphide (PbAgS) by simple chemical bath method under varying pH conditions. Varying pH was achieved using different volume concentration of ammonium hydroxide (NH4OH) solution. The final bath solution for the deposition of the films contained aqueous solutions of Pb(NO3)2, AgNO3, thiourea...

This work numerically investigates the entropy production rate in single-walled carbon nanotubes (SWCNTs)/H2O nanofluid flowing through an inwardly corrugated pipe in turbulent flow regime. The governing equations (continuity, momentum, energy, rate of turbulent production and specific turbulent dissipation) were solved using \(\left( {{\text{SST}}...

Polyaniline-iron oxide nanocomposites were successfully synthesized by in-situ polymerization method. The polyaniline metal oxide nanocomposites formed were characterized using StellarNet UV-VIS-NIR spectrometer (Blue-Wave Miniature; Model: UVNb). The optical properties investigated include; absorbance, transmittance, reflectance, refractive index,...

This work numerically investigated entropy production rate in Al2O3/H2O nanofluid flowing through a convergent pipe in laminar flow regime using computational fluid dynamic and response surface methodology. A parametric study was carried out on Reynolds number (400–2000), nanoparticle concentration (0–3%) and convergence angle (0°, 2.5°, 5° and 7.5...

Chemically synthesized Copper Iron Sulphide (CuFeS) thin films were grow on microscopic glass substrates at room temperature. The deposited films were characterized using Four Point Probe Techniques (Keithley Four Point Probe, Model: 67005) to determine the electrical properties of the film. Current and voltage of the films were obtained from the f...

Silver aluminium selenide (AgAlSe2) thin films have been successfully grown through the reaction of AgNO3, AlCl3.6H2O and Selenium metal powder unto glass substrates using electrochemical deposition technique and annealed at 150°C. The resulting thin films were characterized using Rutherford Back Scattering (RBS), UV-VIS Spectrophotometers and X-ra...

Tin oxide and cobalt doped tin oxide (CTO) thin films were successfully deposited using modified chemical bath method with tin (II) chloride dihydrate and cobalt chloride hexahydrate as precursors for Sn and Co ions respectively, in the presence of ammonium hydroxide as source of oxygen and pH adjuster. The samples obtained were annealed for 4 h at...

Reviews on computational methods for calculation of electronics structure and optical properties of the transition metal chalcogenide systems were presented in this work. Transition metal chalcogenide systems are of two types; binary and ternary transition metal chalcogenide systems. Binary systems are of the form MyXz (where M = transition metals...

Superlattice of ZnO/MgO thin films were successfully synthesized on Fluorine doped Tin Oxide (FTO) glass substrates by means of electrodeposition technique from MgSO4.7H2O, citric acidic and NaOH. A Janway 6405 UV/visible spectrophotometer was used to obtain the spectra absorbance data. Optical properties of the films which include; transmittance,...

We deposited thin films of Tin Oxide (𝑆𝑛𝑂2) on microscopic glass substrates using chemical bath deposition technique at room temperature. Effect of tin ion concentration on the solid-state properties of the films were studied. The synthesis of the films was achieved with the use of tin chloride, ammonium hydroxide, EDTA and distilled water at room...

Thin films of Copper Nickel Selenide (CuNiSe) were synthesized on glass slides at room temperature using chemical bath deposition (CBD) method. The films were deposited from aqueous solution containing copper ion, nickel ion and potassium selenate (K2SeO4) at varying concentration of nickel ion with constant deposition time and pH of the reaction b...

Using climatic and solar parameters such as measured monthly mean global radiation (Hm), the extra-terrestrial monthly mean solar radiation on a horizontal surface (Ho), the daily maximum number of hours of possible sunshine (N) and the daily number of hours of bright sunshine (n) obtained from the archives of National Aeronautics and Space Adminis...

Thin films of Tin Selenide (SnSe) were deposited unto a non – conducting microscopic glass substrates using solution growth technique at room temperature. The deposited thin films of SnSe were subjected to optical and microstructural characterizations. The optical characterization was achieved with the use StellarNet UV – VIS – NIR spectrometer (Bl...

Thin films of Copper Aluminum Oxide (CuAlO2) were successfully deposited on indium tin oxide (ITO) conducting glass substrate by electro deposition technique at varying concentration of aluminum ion. The synthesized films were characterized to determine their compositional, optical, morphological and structural properties. The effect of aluminum co...

Nanofilms of Zinc Oxide (ZnO) were fabricated from solutions of zinc tetraoxosulphate heptahydrate, citric acid, and sodium hydroxide onto a Fluorine Tin Oxide (FTO) conductive glass by elecrodeposition process. Time as bath parameter was varied. Three samples with time interval of 30 seconds, 60 seconds and 90 seconds were fabricated. Absorbance o...

We deposited thin films of Nickel Oxide (NiO) on microscopic glass substrates using chemical bath deposition technique at room temperature. The deposition of the films was achieved with the use of Nickel chloride hexahydrate which served as precursor for Ni 2+ , ammonium hydroxide which served as a pH stabilizer and source of oxygen and EDTA which...

Measurement of global solar radiation and its components is not possible for all locations due to non-availability of solar radiation measuring instruments. This prompted the use of different empirical models that based on climatological parameters of a location for the estimation of global solar radiation. In this study, monthly measured global so...

Cadmium sulphide (CdS), copper sulphide (CuS) thin films and CdS/CuS heterostructure have been deposited by chemical bath method onto glass substrate at room temperature. The absorbance spectra of the fabricated films were obtained with a Janway 6405 UV/ Visible spectrophotometer in the range of wavelength 200nm-1100nm. Structural and surface morph...

This study used monthly mean daily values of global solar radiation, sunshine duration, maximum temperature, minimum temperature, average temperature of Oko, Nigeria with latitude and longitude (6.05 ͦ N and 7.05 ͦ E) gotten from the archive National Aeronautic Space Administration (NASA). These data were used to develop empirical correlation equat...

Chemically synthesized thin films of Copper Zinc Sulphide were successfully fabricated and characterized. The fabrication of the films were done under room temperature of about 300 ± 0.2 K from aqueous solution of copper chloride dehydrate, zinc chloride, thiourea, ammonium solution, Ethylenediaminetetraacetate (EDTA) and Triethanolamine (TEA). Zin...

Chemical bath method of thin film deposition has being successfully used to deposit thin films of Cadmium Silver Sulphide (CdAgS) at room temperature from the mixture of aqueous solutions of Cadmium chloride hemi(pentahydrate), CdCl 2. 2.5H 2 O, Silver nitrate (AgNO 3) and Thiourea, they serve as precursors for Cd 2+ , Ag 2+ and S 2-. Triethanolami...

In this work, meteoroloogical data for Awka (6.207° N, 7.068° E), Enugu (6.452° N, 7.510° E) and Owerri (5.485° N, 7.036° E) in south eastern Nigeria, for the period of 11 years (2000 – 2010) were used to derive Angstrom type regression equations used for estimation of global solar radiation incident on a horizontal surface in the cities studied. I...

Ternary Thin films of FeCuS were grown on glass substrates by Chemical Bath Deposition (CBD) technique above room temperature of 353K at a varying time of deposition. Iron (III) trioxonitrate nanohydrate, copper chloride dihydrate and thiourea were used as sources for iron, copper and sulphur ions respectively. The optical characterization was done...

Ternary thin films of Iron Copper Sul phi de (FeCuS) have been grown and characterized. Optical, compositional, surface microstructure and structural characterization of the deposited fil ms were carried out. Absorbance spectra data of the fil ms were obtained using a Janway 6405 UV-VIS spectrophotometer, absorbance of the films were found to be hi...

This paper reports the deposition and characterization of Copper Zinc Sulphide (CuZnS) ternary thin films prepared by chemical bath deposition technique onto glass substrate at room temperature of 300K from aqueous solution of copper chloride dehydrate, zinc chloride and thiourea, ammonium solution, EDTA and TEA. Copper chloride dehydrate, zinc chl...

Thin films of FeCuS were grown on glass substrates by the Chemical Bath Deposition (CBD) technique at room temperature. Iron (III) trioxonitrate nanohydrate, copper chloride dehydrate and thiourea were used as sources for iron, copper and sulphur ions respectively. The optical characterization was done by using a Janway UV-VIS spectrophotometer in...

Copper selenide (CuSe) thin films was grown by Chemical Bath method on glass substrate at room temperature. The electrical properties of the deposited thin films were investigated using standard four point probe technique. Our result shows variation of the sheet resistance of the deposited films from , the sheet resistivity was found to vary from ,...

Thin films of copper selenide (CuSe) were chemically deposited onto a glass substrate. We studied optical properties which include absorbance, reflectance, transmittance, refractive index, using a Janway 6405 UV/Visible spectrophotometer. Surface morphology of the films were carried out using an Olympus Optical microscope. A bandgap of 2.2eV and re...