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Browsing by Author "Mwakikunga, Bonex W"

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An all optical system for studying temperature induced changes in polycrystalline diamond deposited on a tungsten carbide substrate

Author: Masina, Bathusile N ; Forbes, A ; Bodkin, R ; Mwakikunga, Bonex W Date: Sep 2010 In this poster the authors discussed the ability to heat an industrial diamond sample by means of optical absorption of a CO2 laser beam, and then measure the resulting temperature on the surface of the diamond optically by means of radiometry ... Read more
An all-optical system designed for the heating and temperature measurement of the diamond tool

Author: Masina, Bathusile N ; Forbes, A ; Bodkin, R ; Mwakikunga, Bonex W Date: Jul 2012 Diamond tools are used in industry for abrasive applications such as grinding, and drilling. One of its important applications is in drill bits used for drilling through rock in search of oil. The early failure of drill bits used in oil ... Read more
Antiferromagnetic–paramagnetic state transition of NiO synthesized by pulsed laser deposition

Author: Nkosi, SS ; Yalisi, B ; Motaung, DE ; Keartland, J ; Sideras-Haddad, E ; Forbes, A ; Mwakikunga, Bonex W Date: Jan 2013 Thin films of nickel oxide (NiO) were deposited on Al substrates at different substrate temperatures using pulsed laser deposition (PLD). Microwave power absorption measurements at 9.4 GHz (X-band) were carried out on these PLD grown films. ... Read more
Au-controlled enhancement of photoluminescence of NiS nanostructures synthesized via a microwave-assisted hydrothermal technique

Author: Linganiso, EC ; Mwakikunga, Bonex W ; Mhlanga, SD ; Coville, NJ Date: Nov 2014 Nickel sulphide (NiS) nanostructures decorated with gold (Au) nanoparticles (NPs) were synthesized via a microwave-assisted hydrothermal technique. Binary phase NiS (a and ß) crystalline nanostructures, bare, and decorated with Au NPs were ... Read more
Blood ketone bodies and breath acetone analysis and their correlations in Type 2 Diabetes Mellitus

Author: Saasa, Valentine ; Beukes, M ; Lemmer, Yolandy ; Mwakikunga, Bonex W Date: Dec 2019 Analysis of volatile organic compounds in the breath for disease detection and monitoring has gained momentum and clinical significance due to its rapid test results and non-invasiveness, especially for diabetes mellitus (DM). Studies have ... Read more
Blue- and red-shifts of V2O5 phonons in NH3 environment by in situ Raman spectroscopy

Author: Akande, Amos A ; Machatine, AGJ ; Masina, Bathusile N ; Chimowa, G ; Matsoso, B ; Roro, Kittessa T ; Duvenhage, M-M ; Swart, H ; Bandyopadhyay, J ; Ray, Suprakas S ; Mwakikunga, Bonex W Date: Jan 2018 A layer of ~30 nm V2O5/100 nm-SiO2 on Si was employed in the in situ Raman spectroscopy in the presence of NH3 effluent from a thermal decomposition of ammonium acetate salt with the salt heated at 100 °C. When the layer is placed at 25 °C, ... Read more
Carbon nanotube/nickel oxide nanocomposite thin films for selective solar absorber

Author: Roro, Kittessa T ; Mwakikunga, Bonex W ; Forbes, A ; Tile, N ; Yalisi, B Date: Sep 2010 Multi-walled carbon nanotube (MWCNT)/Nickel oxide nanocomposites were prepared on aluminum substrates for selective solar absorber applications. MWCNTs are functionalized in order to disperse in water and ethanol. Results from the characterization ... Read more
A classification and ranking system on the H2 gas sensing capabilities of nanomaterials based on proposed coefficients of sensor performance and sensor efficiency equations

Author: Mwakikunga, Bonex W ; Motshekga, S ; Sikhwivhilu, L ; Moodley, M ; Scriba, Manfred R ; Malgas, G ; Simo, A ; Maaza, M ; Ray, Suprakas S Date: Jul 2013 A coefficient of performance is defined based on the traditional definitions of response, S, of a chemoresistive sensing material to a specific gas from resistance–time data. The new definition not only considers the S(sub response) and S(sub ... Read more
Clebsch-Gordan coefficients for scattering processes in Si and Ge

Author: Kunert, HW ; Machatine, AGJ ; Niyongabo, P ; Govender, M ; Mwakikunga, Bonex W Date: Oct 2012 Scattering matrix for two phonon processes at k = 0 in Si and Ge of O(sup7)(subh) symmetry is given. Also diagonalization of spin-orbit interaction Hamiltonian has been computed by means of Clebsh-Gordan coefficients. The authors have concluded ... Read more
Comparative study: the effect of annealing conditions on the properties of P3HT:PCBM blends

Author: Motaung, DE ; Malgas, GF ; Nkosi, SS ; Mhlongo, Gugu H ; Mwakikunga, Bonex W ; Malwela, T ; Arendse, CJ ; Muller, TFG ; Cummings, FR Date: Feb 2013 This paper presents a detailed study on the role of various annealing treatments on organic poly(3-hexylthiophene) and [6]-phenyl-C(sub61)-butyric acid methyl ester blends under different experimental conditions. A combination of analytical ... Read more
Defect-induced magnetism in undoped and Mn-doped wide band gapzinc oxide grown by aerosol spray pyrolysis

Author: Motaung, DE ; Kortidis, I ; Papadaki, D ; Nkosi, SS ; Mhlongo, Gugu H ; Wesley-Smith, J ; Malgas, GF ; Mwakikunga, Bonex W ; Coetsee, E ; Swart, HC ; Kiriakidis, G ; Ray, SS Date: Aug 2014 We present a systemic study on the structural, optical and magnetic properties of the un-doped and Mn doped ZnO thin films grown by aerosol spray pyrolysis at different deposition times. XRD profilinghas shown that the structures of the ... Read more
Defect-induced room temperature ferromagnetic properties of the Al-doped and undoped ZnO rod-like nanostructure

Author: Jule, L ; Dejene, F ; Ali, AG ; Roro, Kittessa T ; Mwakikunga, Bonex W Date: Jul 2017 In this work, electron paramagnetic resonance (EPR) experiment on undoped ZnO and Al doped ZnO (AZO) nanoparticles prepared by facile sol–gel method were investigated. The effects of the Al concentration on room temperature ferromagnetic (FM) ... Read more
Determination of the emissivity of the tungsten hexa-ethoxide pyrolysis flame using Fourier Transform Infrared (FTIR) spectroscopy

Author: Mudau, AE ; Mwakikunga, Bonex W ; Brink, N ; Willers, Cornelius J ; Forbes, A ; Shikwambana, L ; Govender, M Date: Sep 2010 To determination the temperature using infrared cameras, the following issues need to be addressed, the emissivity of the object and atmospheric path effects. The later is negligible in the setup used. In this paper authors present the ... Read more
Diffusion of Co and W in diamond tool induced by 10.6 µm CO2 laser radiation

Author: Masina, Bathusile N ; Forbes, Andrew ; Mwakikunga, Bonex W ; Bodkin, R Date: May 2011 At present it is known that diamond tools degrade with time as it is normally used at high temperatures. One of the questions the authors like to answer in this study is whether thermally induced problems in diamond tool arise as a result of ... Read more
Effect of accelerated thermal ageing on the selective solar thermal harvesting properties of multiwall carbon nanotube/nickel oxide nanocomposite coatings

Author: Roro, Kittessa T ; Mwakikunga, Bonex W ; Tile, N ; Yalisi, B ; Forbes, A Date: May 2012 Varying amounts of dispersed multiwalled carbon nanotubes in NiO have been used to develop composites that absorb the solar energy very well but lose very little through emission. Determination of absorptance, asol, and emissivity, ether, ... Read more
The effect of Co and In combinational or individual doping on the structural, optical and selective sensing properties of ZnO nanoparticles

Author: Maswanganye, MW ; Rammutla, KE ; Mosuanga, TE ; Mwakikunga, Bonex W Date: Aug 2017 Variably doped ZnO samples by the sol-gel process have been tested for response to humidity and industrial gases of CO, CH(sub4), NH(sub3) and H9sub2). The elements of Cobalt (Co) and Indium (In) either singly doped or co-doped at 5 wt% and ... Read more
Effect of laser wavelength in PLD in the orientation and thermochromic properties of VO2 (M1) on a glass substrate

Author: Masina, Bathusile N ; Akande, Amos A ; Mwakikunga, Bonex W Date: Dec 2019 Highly oriented VO2 (M1) thin films are difficult to produce using non-crystalline substrates. For example, to produce such films on glass has required post-annealing or the use of a ZnO transparent layer. Here, we overcome this challenge and ... Read more
Effect of varying ethanol and water compositions on the acetone sensing properties of WO3 for application in diabetes mellitus monitoring

Author: Saasa, Valentine ; Lemmer, Yolandy ; Malwela, Thomas ; Akande, Amos A ; Beukes, M ; Mwakikunga, Bonex W Date: Mar 2020 Tungsten oxide based gas sensors have attracted a lot of attention in breath acetone analysis due to their potential in clinical diagnosis of diabetes. The major problem with this material in sensor application has been remarkable response ... Read more
Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis

Author: Govender, M ; Mwakikunga, Bonex W ; Machatine, AGJ ; Kunert, HW Date: Feb 2014 Laser pyrolysis was chosen to synthesize tungsten trioxide starting with tungsten ethoxide precursor. The film was found to have a thickness that varied from 205 nm to 1 µm. X-ray diffraction and Raman spectroscopy confirmed the presence of ... Read more
Electronic to protonic conduction switching in Cu2O nanostructured porous films: the effect of humidity exposure

Author: Dhonge, BP ; Ray, Suprakas S ; Mwakikunga, Bonex W Date: Apr 2017 In this paper, we present the first experimental evidence for electronic to protonic conduction switching in p-type semiconducting nanostructured cuprous oxide Cu2O porous films when exposed to humidity. We also present a linear response at ... Read more

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