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Browsing by Author "Machatine, AGJ"

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Ammonia gas sensing characteristics of V2O5 nanostructures: A combined experimental and ab initio density functional theory approach

Author: Akande, Amos ; Mosuang, T ; Ouma, CNM ; Benecha, EM ; Tesfamicheal, T ; Roro, Kittessa T ; Machatine, AGJ ; Mwakikunga, BW Date: Apr 2020 A combined experimental and density functional theory study of NH(sub3) gas sensing and adsorption characteristics of a-V(sub2)O(sub5) synthesized from hydrated NH4VO3 in CVD at 400 °C (in N(sub2) for 12 and 24 h.) is presented. Highly ... 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
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
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
Gate voltage controlled humidity sensing using MOSFET of VO2 particles

Author: Akande, Amos A ; Dhonge, BP ; Mwakikunga, Bonex W ; Machatine, AGJ Date: 2017 This article presents gate-voltage controlled humidity sensing performance of vanadium dioxide nanoparticles prepared from NH4VO3 precursor using microwave irradiation technique. The X-ray diffraction, transmission electron diffraction, and ... Read more
Optical selection rules and scattering processes in rocksalt wide band gap ZnO

Author: Kunert, HW ; Govender, M ; Machatine, AGJ ; Mwakikunga, Bonex W ; Niyongabo, P Date: Feb 2014 At sufficiently high pressures, wurtzite structure zinc oxide (W-ZnO) can be transformed to the cubic rocksalt (R-ZnO) structure. The R-ZnO exhibits semiconductor behavior with an indirect wide band gap of inline image. The maximum valence ... Read more
Scattering tensors and optical transitions in Si and Ge

Author: Kunert, HW ; Machatine, AGJ ; Niyongabo, P ; Govender, M ; Mwakikunga, Bonex W Date: Aug 2012 The selection rules (SR’s) for the Kronecker product (KP) of Si and Ge irreducible representations (irreps) are required to determine the intervalley scattering processes. The SR’s for transitions between the lowest conduction band minima at ... Read more

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Browsing by Author "Machatine, AGJ"

Browsing by Author "Machatine, AGJ"

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