Research Articles (Physics): Recent submissions

Now showing items 441-460 of 719

Raman analysis of bilayer graphene film prepared on commercial Cu(0.5 at% Ni) foil

Madito, M.J. (Moshawe); Bello, Abdulhakeem; Dangbegnon, Julien K.; Oliphant, C.J.; Jordaan, W.A.; Masikhwa, T.M. (Tshifhiwa); Momodu, Damilola Y.; Manyala, Ncholu I. (Wiley, 2016-05)

This study reports the Raman analysis of bilayer graphene films prepared on commercial dilute Cu(0.5 at% Ni) foils using atmospheric pressure chemical vapor deposition. A bilayer graphene film obtained on Cu foil is known ...
A wafer-scale Bernal-stacked bilayer graphene film obtained on a dilute Cu (0.61 at% Ni) foil using atmospheric pressure chemical vapour deposition

Madito, M.J. (Moshawe); Manyala, Ncholu I.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Masikhwa, T.M. (Tshifhiwa); Momodu, Damilola Y. (Royal Society of Chemistry, 2016)

A bilayer graphene film was synthesized on a dilute Cu (0.61 at% Ni) foil using atmospheric pressure chemical vapour deposition (AP-CVD). Atomic force microscopy average step height analysis, scanning electron microscopy ...
Kinetics of growth of thin-films of Co2Si, Ni2Si, WSi2 and VSi2 during a reactive diffusion process

Akintunde, S.O. (Samuel); Selyshchev, Pavel (Elsevier, 2016)

A theoretical approach is developed which describes the growth kinetics of thin films of near noble metal silicide (especially of cobalt silicide (Co2Si) and nickel silicide (Ni2Si)) and refractory metal silicide (particularly ...
Surface and interface reaction analysis of Zr films deposited on 6H-SiC after thermal annealing

Njoroge, Eric Gitau; Theron, C.C. (Chris); Hlatshwayo, Thulani Thokozani; Malherbe, Johan B. (Royal Society of Chemistry, 2016)

Zr films (130 nm) were deposited on a 6H-SiC substrate at room temperature by sputter deposition. The interface solid-state reactions due to high vacuum thermal annealing between 600 °C and 850 °C for 30 min were investigated ...
Ab-initio study of MgSe self-interstitial (Mgi and Sei)

Igumbor, Emmanuel; Obodo, Kingsley Onyebuchi; Meyer, Walter Ernst (Trans Tech Publications, 2016)

We present detailed calculations of formation and thermodynamics transition state energies of Mgi and Sei interstitial defects in MgSe using generalized gradient approximation (GGA) and local density approximation (LDA) ...
Electrical characterization of defects introduced in n-type N-doped 4H-SiC during electron beam exposure

Omotoso, Ezekiel; Meyer, Walter Ernst; Auret, Francois Danie; Coelho, Sergio M.M.; Ngoepe, Phuti Ngako Mahloka (Trans Tech Publications, 2016)

Deep level transient spectroscopy (DLTS) was used to characterize the defects introduced in n-type, N-doped, 4H-SiC while being exposed to electron beam evaporation conditions. This was done by heating a tungsten source ...
Microwave-assisted synthesis of cobalt sulphide nanoparticle clusters on activated graphene foam for electrochemical supercapacitors

Masikhwa, T.M. (Tshifhiwa); Madito, M.J. (Moshawe); Bello, Abdulhakeem; Lekitima, Joel N.; Manyala, Ncholu I. (Royal Society of Chemistry, 2017)

Cobalt sulphide (Co9S8) nanoparticles clusters embedded in activated graphene foam (AGF) structure were prepared using microwave-assisted hydrothermal synthesis. Morphological characterization of as-prepared Co9S8/AGF ...
Exploring the stability and electronic structure of beryllium and sulphur co-doped graphene : a first principles study

Olaniyan, Okikiola; Mapasha, Refilwe Edwin; Momodu, Damilola Y.; Madito, M.J. (Moshawe); Kahleed, A.A.; Ugbo, F.U.; Bello, Abdulhakeem; Barzegar, Farshad; Oyedotun, Kabir Oyeniran; Manyala, Ncholu I. (Royal Society of Chemistry, 2016-09)

First principles density functional theory (DFT) calculations have been performed to explore the stability, structural and electronic properties of Be and S codoped graphene sheets. The band-gap of graphene has been tuned ...
Structural, morphological, optical and electrical properties of Schottky diodes based on CBD deposited ZnO : Cu nanorods

Mwankemwa, Benard S.; Legodi, Matshisa Johannes; Mlambo, Mbuso; Nel, Jacqueline Margot; Diale, M. (Mmantsae Moche) (Elsevier, 2017-07)

Undoped and copper doped zinc oxide (ZnO) nanorods have been synthesized by a simple chemical bath deposition (CBD) method at a temperature of 90 C. Structural, morphological, optical and electrical properties of the ...
In-situ RBS studies of strontium implanted glassy carbon

Odutemowo, Opeyemi Shakirah; Malherbe, Johan B.; Theron, C.C. (Chris); Njoroge, Eric Gitau; Wendler, E. (Elsevier, 2016-04)

The diffusion behaviour of strontium in glassy carbon was investigated using in-situ real time Rutherford backscattering spectrometry. The sample was annealed in vacuum from room temperature to 650 oC. Diffusion of the ...
Chemical and electrical characteristics of annealed Ni/Au and Ni/Ir/Au contacts on AlGaN

Ngoepe, Phuti Ngako Mahloka; Meyer, Walter Ernst; Auret, Francois Danie; Omotoso, Ezekiel; Diale, M. (Mmantsae Moche); Swart, H.C.; Duvenhage, M.M.; Coetsee, E. (Elsevier, 2016-01)

The evolution of Ni/Au and Ni/Ir/Au metal contacts deposited on AlGaN was investigated at different annealing temperatures. The samples were studied with electrical and chemical composition techniques. I-V characteristics ...
Potential for identifying plant-based toxins on San hunter-gatherer arrowheads

Wooding, Madelien; Bradfield, Justin; Maharaj, Vinesh J.; Koot, Dwayne; Wadley, Lyn; Prinsloo, Linda Charlotta; Lombard, Marlize (Academy of Science of South Africa, 2017-03)

The antiquity of the use of hunting poisons has received much attention in recent years. In this paper we present the results of a pilot study designed to detect the presence of organic compounds, typically of less ...
Strehl ratio and amplitude-weighted generalized orthonormal Zernike-based polynomials

Mafusire, Cosmas; Kruger, T.P.J. (Tjaart) (Optical Society of America, 2017-03)

The concept of orthonormal polynomials is revisited by developing a Zernike-based orthonormal set for a non-circular pupil that is transmitting an aberrated, non-uniform field. We refer to this pupil as a general pupil. ...
High electrochemical performance of hybrid cobalt oxyhydroxide/nickel foam graphene

Masikhwa, T.M. (Tshifhiwa); Madito, M.J. (Moshawe); Momodu, Damilola Y.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2016-12)

In this study, we report the in-situ hydrothermal synthesis of mesoporous nanosheets of cobalt oxyhydroxide (CoOOH) on nickel foam graphene (Ni-FG) substrate, obtained via atmospheric pressure chemical vapour deposition ...
DLTS characterization of defects in GaN induced by electron beam exposure

Ngoepe, Phuti Ngako Mahloka; Meyer, Walter Ernst; Auret, Francois Danie; Omotoso, Ezekiel; Diale, M. (Mmantsae Moche) (Elsevier, 2017-06)

The deep level transient spectroscopy (DLTS) technique was used to investigate the effects of electron beam exposure (EBE) on n-GaN. A defect with activation energy of 0.12 eV and capture cross section of 8.0 × 10-16 cm2 ...
Controlling light harvesting with light

Gwizdala, Michal; Berera, Rudi; Kirilovsky, Diana; Van Grondelle, Rienk; Kruger, T.P.J. (Tjaart) (American Chemical Society, 2016-09)

When exposed to intense sunlight all organisms performing oxygenic photosynthesis implement various photoprotective strategies to prevent potentially lethal photodamage. The rapidly responding photoprotective mechanisms, ...
Characterising pigments on 30 000-year-old portable art from Apollo 11 Cave, Karas Region, southern Namibia

Rifkin, Riaan F.; Prinsloo, Linda Charlotta; Dayet, Laure; Haaland, Magnus M.; Henshilwood, Christopher S.; Diz, Enrique Lozano; Moyo, Stanley; Vogelsang, Ralf; Kambombo, Fousy (Elsevier, 2016-02)

As an unambiguous indication of complex cognitive capacity, representational art presents explicit evidence for modern and symbolic human behaviour. The only examples of African figurative art dating to the Late ...
Investigation of amorphization energies for heavy ion implants into silicon carbide at depths far beyond the projected ranges

Friedland, Erich Karl Helmuth (Elsevier, 2017-01)

At ion energies with inelastic stopping powers less than a few keV/nm, radiation damage is thought to be due to atomic displacements by elastic collisions only. However, it is well known that inelastic processes and ...
Hydrothermal synthesis of manganese phosphate/graphene foam composite for electrochemical supercapacitor applications

Mirghni, Abdulmajid Abdallah; Masikhwa, T.M. (Tshifhiwa); Oyedotun, Kabir Oyeniran; Bello, Abdulhakeem; Manyala, Ncholu I. (Elsevier, 2017-05)

Please read abstract in the article.
An exploration of indigenous knowledge related to physics concepts held by senior citizens in Chókwé, Mozambique

Baquete, Aguiar Muambalane; Grayson, Diane J.; Mutimucuio, Vasco (Routledge, 2016-01)

Indigenous knowledge is at risk of being lost in many parts of the world. It is important to find ways to preserve it for both cultural and practical reasons, since it is often well-suited to addressing local needs using ...

Now showing items 441-460 of 719

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