Research Articles (Physics): Recent submissions

Now showing items 561-580 of 719

Solid state reaction of ruthenium with 6H-SiC under vacuum annealing and the impact on the electrical performance of its Schottky contact for high temperature operating SiC-based diodes

Munthali, Kinnock V.; Theron, C.C. (Chris); Auret, Francois Danie; Coelho, Sergio M.M.; Prinsloo, Linda Charlotta; Njoroge, Eric Gitau (Springer, 2014-12)

Thin films and Schottky diodes dots of ruthenium (Ru) on bulk-grown n-type-6-hexagonal-silicon carbide (6H-SiC) were annealed isochronally in a vacuum furnace at temperatures ranging from 500–1,000 °C. Rutherford backscattering ...
Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors

Momodu, Damilola Y.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Barzegar, Farshad; Taghizadeh, Fatemeh; Fabiane, Mopeli; Johnson, Alan T. Charlie; Manyala, Ncholu I. (American Institute of Physics, 2014-09-17)

In this paper, we demonstrate excellent pseudo-capacitance behavior of nickelaluminum double hydroxide microspheres (NiAl DHM) synthesized by a facile solvothermal technique using tertbutanol as a structure-directing ...
Preparation and characterization of Poly(vinyl alcohol)/graphene nanofibers synthesized by electrospinning

Barzegar, Farshad; Bello, Abdulhakeem; Fabiane, Mopeli; Khamlich, Saleh; Momodu, Damilola Y.; Taghizadeh, Fatemeh; Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2015-02)

We report on the synthesis and characterization of electrospun polyvinyl alcohol (PVA)/graphene nanofibers. The samples produced were characterized by Raman spectroscopy for structural and defect density analysis, scanning ...
Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes

Bello, Abdulhakeem; Barzegar, Farshad; Momodu, Damilola Y.; Dangbegnon, Julien K.; Taghizadeh, Fatemeh; Fabiane, Mopeli; Manyala, Ncholu I. (Elsevier, 2015-01)

We present the electrochemical results of highly porous and interconnected carbon material by activation of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F. Asymmetric supercapacitor ...
In search of the optimum Raman/IR signatures of potential ingredients used in San/Bushman rock art paint

Prinsloo, Linda Charlotta; Tournié, Aurélie; Colomban, Philippe; Paris, Céline; Bassett, Stephen T. (Elsevier, 2013-07)

Vibrational spectroscopy (Raman and FTIR) has played an important role in identifying pigments, substrata and deterioration products in rock art studies worldwide: in the laboratory and on-site. However, the detection ...
The new Heavy Ion ERDA set up at iThemba LABS Gauteng : multilayer thin film depth profiling using direct calculation and Monte Carlo simulation codes

Msimanga, M.; Wamwangi, D.; Comrie, C.M.; Pineda-Vargas, C.A.; Nkosi, M.; Hlatshwayo, Thulani Thokozani (Elsevier, 2013-02)

We report here on the recently built Heavy Ion ERDA set up at iThemba LABS Gauteng; describing a typical application in the study of interfacial reactions in an Al2O3–Ti ceramic–metal multilayer structure annealed in ...
SEM analysis of ion implanted SiC

Malherbe, Johan B.; Van der Berg, Nic (Nicolaas George); Botha, A.J.; Friedland, Erich Karl Helmuth; Hlatshwayo, Thulani Thokozani; Kuhudzai, Remeredzai Joseph; Wendler, E.; Wesch, W.; Chakraborty, P.; Da Silveira, E.F. (Elsevier, 2013-11)

SiC is a material used in two future energy production technologies, firstly as a photovoltaic layer to harness the UV spectrum in high efficient power solar cells, and secondly as a diffusion barrier material for radioactive ...
Chemical adsorption of NiO nanostructures on nickel foam-graphene for supercapacitor applications

Bello, Abdulhakeem; Makgopa, Katlego; Fabiane, Mopeli; Dodoo-Arhin, David; Ozoemena, Kenneth I.; Manyala, Ncholu I. (Springer, 2013-10)

Few-layer graphene was synthesized on a nickel foam template by chemical vapor deposition. The resulting three-dimensional (3D) graphene was loaded with nickel oxide nanostructures using the successive ionic layer adsorption ...
First principles calculations of pentaheptite graphene and boronitrene derivatives

Molepo, Mahlanga P.; Mapasha, Refilwe Edwin; Obodo, K.O. (Kingsley Onyebuchi); Chetty, Nithaya (Elsevier, 2014-09)

We perform first principles density functional calculations to study the stability, structural and electronic properties of pentaheptite graphene and boronitrene derivatives. These systems are comprised of an infinite ...
Morphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitors

Abdulhakeem, Bello; Farshad, Barzegar; Damilola, Momodu; Fatimeh, Taghizadeh; Mopeli, Fabiane; Julien, Dangbegnon; Ncholu, Manyala (Royal Society of Chemistry, 2014)

The design and fabrication of porous electrode materials is highly desirable for improving the performance of electrochemical supercapacitors (ECs) and thus, it is important to produce such porous materials in large quantities. ...
Microstructure evolution and diffusion of ruthenium in silicon carbide, and the implications for structural integrity of SiC layer in TRISO coated fuel particles

Munthali, Kinnock V.; Theron, C.C. (Chris); Auret, Francois Danie; Coelho, Sergio M.M.; Prinsloo, Linda Charlotta; Njoroge, Eric Gitau (Elsevier, 2014-05)

A thin film of ruthenium (Ru) was deposited on n-type 4H–SiC and 6H–SiC by electron beam deposition technique so as to study interface reaction of ruthenium with silicon carbide at various annealing temperatures, and in ...
Functionalized graphene foam as electrode for improved electrochemical storage

Bello, Abdulhakeem; Fabiane, Mopeli; Momodu, Damilola Y.; Khamlich, Saleh; Dangbegnon, Julien K.; Manyala, Ncholu I. (Springer, 2014-09)

We report on a non-covalent functionalization of graphene foam (GF) synthesized via chemical vapour deposition (CVD). The GF was treated with pyrene carboxylic acid (PCA) which acted as a source of oxygen and/or ...
Limits on Pluto’s ring system from the June 12 2006 stellar occultation and implications for the New Horizons impact hazard

Throop, Henry B.; French, Richard G.; Shoemaker, Kevin; Olkin, Cathy B.; Ruhland, Trina R.; Young, Leslie A. (Elsevier, 2015-01)

The Pluto system passed in front of a 15th magnitude star on 12 June 2006. We observed this occultation from the 3.9 m Anglo-Australian Telescope (AAT), and took photometric observations every 100 ms for 3 h. Our three-hour ...
A method for extracting the resonance parameters from experimental cross-sections

Rakityansky, Sergei Anatoljevich; Elander, N. (World Scientific, 2013)

Within the proposed method, a set of experimental data points are fitted using a multi-channel S-matrix. Then the resonance parameters are located as its poles on an appropriate sheet of the Riemann surface of the ...
Iodine assisted retainment of implanted silver in 6H-SiC at high temperatures

Hlatshwayo, Thulani Thokozani; Van der Berg, Nic (Nicolaas George); Msimanga, M.; Malherbe, Johan B.; Kuhudzai, Remeredzai Joseph (Elsevier, 2014-09)

The effect of high temperature thermal annealing on the retainment and diffusion behaviour of iodine (I) and silver (Ag) both individually and co-implanted into 6H-SiC has been investigated using RBS, RBS-C and heavy ion ...
The evolution of the nanoscale dissipative structures in a distribution of defects within the isothermally irradiated f.c.c. crystal

Tatarenko, Valentyn A.; Selyshchev, Pavel; Oliinyk, Olena V.; Park, Yong Bum (Taylor & Francis, 2014)

A kinetic model for the influence of external noises such as fluctuations of the vacancies’ generation rate and inhomogeneity of irradiated f.c.c. crystal on the formation of nanoscale modulated dissipative structure in ...
Optical selection rules and scattering processes in rocksalt wide band gapZnO

Kunert, Herbert W.; Govender, Malcolm; Machatine, Augusto Gonçalo Jose; Mwakikunga, B.W.; Niyongabo, Prime (Wiley-Blackwell, 2014-02)

At sufficiently high pressures, wurtzite structure zinc oxide (WZnO) can be transformed to the cubic rocksalt (R-ZnO) structure. The R-ZnO exhibits semiconductor behavior with an indirect wide band gap of Eg ¼ 5:5 eV. ...
Implementation of an AlGaN-based solar-blind UV four-quadrant detector

Van Schalkwyk, Louwrens; Meyer, Walter Ernst; Nel, Jacqueline Margot; Auret, Francois Danie; Ngoepe, Phuti Ngako Mahloka (Elsevier, 2014-04)

Please read abstract in the article.
Analytic structure of the multichannel Jost matrix for potentials with Coulombic tails

Rakityansky, Sergei Anatoljevich; Elander, N. (American Institute of Physics, 2013-12-31)

A quantum system is considered that can move in N two-body channels with the potentials that may include the Coulomb interaction. For this system, the Jost matrix is constructed in such a way that all its dependencies ...
Electrical characterization of defects introduced in n-Ge during electron beam deposition or exposure

Coelho, Sergio M.M.; Auret, Francois Danie; Janse van Rensburg, Pieter Johan; Nel, Jacqueline Margot (American Institute of Physics, 2013)

Schottky barrier diodes prepared by electron beam deposition (EBD) on Sb-doped n-type Ge were characterized using deep level transient spectroscopy (DLTS). Pt EBD diodes manufactured with forming gas in the chamber had ...

Now showing items 561-580 of 719

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