Browsing by Author "Sakwa, Thomas"
Now showing items 1-7 of 7
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Compositional analysis and optical properties of Co doped TiO2 thin films fabricated by spray pyrolysis method for dielectric and p hotocatalytic applications
Wafula, Henry Barasa; Musembi, Robinson Juma; Juma, Albert Owino; Tonui, Patrick; Simiyu, Justus; Sakwa, Thomas; Prakash, Deo; Verma, K.D. (Optik, 2017-01)Cobalt doped TiO2 thin films (CTF) deposited by spray pyrolysis has been studied. The compositional analysis has been done using RBS method, while optical spectroscopy has been done by measuring the transmittance and ... -
Computer Modeling for Science, Technology, Engineering and Mathematics Curriculum in Kenya: A Simulation-Based Approach to Science Education
Sifuna, James; Manyali, George; Sakwa, Thomas; Mukasia, Alima (Science Publishing group, 2016-01-09)Developed countries have appreciated the importance of Science, Technology, Engineering and Mathematics (STEM) for scientific and technological development. STEM subjects have been posting low results in the Kenya Certificate ... -
Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)
Awino, Celline; Odari, Victor; Dittrich, Thomas; Prajongtat, Pongthep; Sakwa, Thomas; Rech, Bernd (MDPI, 2017-05-26)Studies have shown that perovskites have a high potential of outdoing silicon based solar cells in terms of solar energy conversion, but their rate of degradation is also high. This study reports on improvement on the ... -
Quantum Phase Transition: Intra and Inter-Band Interaction on D- Wave Superconductivity
Otimo, Solomon; Sakwa, Thomas; Ayodo, Yuda Kennedy; Sifuna, James (Science Publishing group, 2017-01-18)There are compounds whose structures support superconductivity at high temperatures. They have intra and inter-band interactions which occur within their bands. However there has been no hybrid Hamiltonian developed so far ... -
Role of Cl on Diffusion of Cu in In2S3 Layers Prepared by Ion Layer Gas Reaction Method
Wafula, Henry; Robinson, Musembi; Juma, Albert; Sakwa, Thomas; e Kitui, Manass; Araoz, Rodrigo; Fischer, Christian-H. (coatings, 2015-02-15)Ion layer gas reaction (ILGAR) method allows for deposition of Cl-containing and Cl-free In2S3 layers from InCl3 and In(OCCH3CHOCCH3)3 precursor salts, respectively. A comparative study was performed to investigate the ... -
Structural and Mechanical Properties of Bulk Scandium Trifluoride Investigated by First-Principles Calculations
Sifuna, James; Manyali, George; Sakwa, Thomas; Manasse, Kitui (Journal of Multidisciplinary Engineering Science and Technology, 2017-02-28)Cubic Scandium Triflouride (ScF3) is a material that contracts when exposed to heat. Not many materials are known to behave this way. Such a material has many interesting technological applications yet some of its properties ... -
A Surface Photovoltage Study of Surface Defects on Co-Doped TiO2 Thin Films Deposited by Spray Pyrolysis
Wafula, Henry; Juma, Albert; Sakwa, Thomas; Musembi, Robinson; Simiyu, Justus (MDPI, 2016-07-22)Surface photovoltage (SPV) spectroscopy is a powerful tool for studying electronic defects on semiconductor surfaces, at interfaces, and in bulk for a wide range of materials. Undoped and Cobalt-doped TiO2 (CTO) thin films ...