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Preparation and characterization of NbxOy thin films : a review

Mechanical and water absorption behaviour of potassium permanganate (KMnO4) treated plantain (Musa Paradisiaca) fibre/epoxy bio-composites

  • Authors: Imoisili, Patrick Ehi , Jen, Tien-Chien
  • Date: 2020
  • Subjects: Water absorption , Bio-composite , Muse paradisiaca
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/435602 , uj:37754 , Citation: Imoisili, P.E. & Jen, T.C. 2020. Mechanical and water absorption behaviour of potassium permanganate (KMnO4) treated plantain (Musa Paradisiaca) fibre/epoxy bio-composites. , DOI: https://doi.org/10.1016/j.jmrt.2020.05.121
  • Description: Abstract: The use of environmentally friendly agro-waste fibres as reinforcement has opened a newdirection to polymer composite science. Research has suggested that changing the surfaceof the fibre by both physical and chemical processes improves the efficiency of the naturalfibre/polymer matrix. This research explores the kinetic and function of water absorptionand its relevance for the mechanical properties of potassium permanganate (KMnO4) treatedplantain (Muse Paradisiaca) fibres reinforced epoxy bio-composite. Treated fibres were char-acterized by wide-angle X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanningelectron microscope (SEM) and thermogravimetric analysis (TGA). The XRD study shows asignificant shift in the crystallographic parameters of the material, the FTIR spectral indi-cates the fractional elimination of wax, hemicellulose and lignin substance. TGA indicatesthat the thermal stability of the fibres was improved following treatment. Ruptured sampleswere studied using a SEM. The analysis indicates that, owing to the water penetration of thefibre matrix interface and prolongation of the water-immersion cycle, there was a decreasein the tensile and flexural strength of the bio-composites. Nevertheless, the mechanicaland water-resistant properties have been strengthened by KMnO4. The mechanism andkinetic of water absorption reveals a Fickian kind of diffusion and propensity to followFickian behaviour thus creating prospects and reliability of the bio-composite to be usein engineering and structural applications.
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Physical, mechanical and thermal properties of high frequency microwave treated plantain (Musa Paradisiaca) fibre/MWCNT hybrid epoxy nanocomposites

Microwave-assisted sol–gel synthesis of TiO2-mixed metal oxide nanocatalyst for degradation of organic pollutant

Performance characteristics of unsaturated polyester reinforced with high frequency microwave treated natural fibre

Facile extraction and characterization of silica nanoparticles from corn stalk by sol-gel hydrothermal methods

Synthesis and photocatalytic performance of Ag-TiVOX nanocomposite

  • Authors: Ntobeng, Mahubedu Khutso , Imoisili, Patrick Ehi , Jen, Ten-Chien
  • Date: 2020
  • Subjects: Titanium , Nanocomposite , Methylene blue
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/458235 , uj:40693 , Ntobeng, M.K., Imoisili, P.E., Jen, T.: Synthesis and photocatalytic performance of Ag-TiVOX nanocomposite. DOI: https://doi.org/10.1016/j.jksus.2020.08.021
  • Description: Abstract: A silver, vanadium and silver/vanadium doped titanium dioxide (TiO2, Ag-TiO2, V-TiO2 and Ag-TiVOX) nanocomposite photocatalyst was achieved via a modify sol–gel and hydrothermal method. Structural analysis by X-Ray Diffraction (XRD) depicted the lattice fringes for both anatase and rutile in its crystalline phase in the synthesized nanocomposites. Surface areas (SBET) analysis shows that surface area of synthesized Ag-TiVOX is 46.01 m2/g, compare to TiO2 64.75 m2/g, Ag-TiO2 61.33 m2/g and V-TiO2 62.73 m2/g. Optical absorption results demonstrated by UV–Visible Spectroscopy (UV–Vis) shows that the effects of Ag and V doping was a shift in spectrum to the visible light region, enhancing the visible light absorption capacity of the synthesized photocatalyst. The optical absorption of Ag-TiVOX achieved a reduced bandgap energy of 2.2 eV, as compared to Ag-TiO2 (2.8 eV), V-TiO2 (2.3 eV) and TiO2 (2.9 eV). Morphological characterization by Transition Electron Microscope (TEM) and Scanning Electron Microscope (SEM), depicting a cluster composed of spherical aggregates particles of non-uniform diameter nanoparticles with particle size ranging between 10 and 50 nm. Synthesized Ag-TiVOx demonstrated remarkable photocatalytic capabilities under visible light irradiation, as 99.83 percent of methylene blue (MB) degradation was accomplished during the first 15 min. Impact of Ag and V doping of TiO2 showed enhancement in the photocatalytic activity, reporting excellent removal rates and achieving well desirable decline in the band gap energy.
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Facile fabrication of vanadium sensitized silver titanium oxides (V-Ag/TiO2) photocatalyst nanocomposite for pollutants removal in river water

Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS

  • Authors: Ukoba, Kingsley , Imoisili, Patrick Ehi , Jen, Tien-Chien
  • Date: 2020
  • Subjects: Cu2O , Performance , Nanostructured
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/438876 , uj:38163 , Citation: Ukoba, K., Imoisili, P.E. & Jen, T.C. 2020. Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS.
  • Description: Abstract: This paper reported numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells. Metal oxides thin films including Copper oxides are promising materials for photovoltaic applications. Although, the efficiency is still lower than other solar cells materials. This paper focused on improving the efficiency of Cu2O/TiO2 solar cells using SCAPS simulation tool. This was done by varying the effect of film surface thickness and effect of varying deposition temperature on the solar cells. The aim of the study is to serve as a theoretical guide for laboratory research on the improvement of efficiency of Cu2O metal oxide solar cells. The solar cells equations were modelled and thereafter theoretical validation of the nanostructured metal oxides was performed. The model working points input power of 100 mW/m2 using an illumination of AM1.5 lamp. The modelled solar cell exhibits a short-circuit current (Jsc) of 26.57 mA/cm2, 0.7188 V open-circuit voltage (Voc), fill factor (FF) of 70, and 13.37% efficiency (η). A value of 2.30 eV was recorded for the band gap. Also, electron affinity and Nyquist plot were obtained for the solar cells. Solar cells with thin absorber surface thickness will result in lower fabrication cost. This will open a new frontier for modelling of metal oxide based thin films solar cells especially Cu2O thin films solar cells.
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Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS

  • Authors: Ukoba, Kingsley , Imoisili, Patrick Ehi , Jen, Tien-Chien
  • Date: 2020
  • Subjects: Cu2O , Performance , Nanostructured
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/461582 , uj:41118 , Citation: Kingsley, U., Imoisili, P.E. & Jen, T-C. 2020. Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS. DOI:
  • Description: Abstract: This paper reported numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells. Metal oxides thin films including Copper oxides are promising materials for photovoltaic applications. Although, the efficiency is still lower than other solar cells materials. This paper focused on improving the efficiency of Cu2O/TiO2 solar cells using SCAPS simulation tool. This was done by varying the effect of film surface thickness and effect of varying deposition temperature on the solar cells. The aim of the study is to serve as a theoretical guide for laboratory research on the improvement of efficiency of Cu2O metal oxide solar cells. The solar cells equations were modelled and thereafter theoretical validation of the nanostructured metal oxides was performed. The model working points input power of 100 mW/m2 using an illumination of AM1.5 lamp. The modelled solar cell exhibits a short-circuit current (Jsc) of 26.57 mA/cm2, 0.7188 V open-circuit voltage (Voc), fill factor (FF) of 70, and 13.37% efficiency (η). A value of 2.30 eV was recorded for the band gap. Also, electron affinity and Nyquist plot were obtained for the solar cells. Solar cells with thin absorber surface thickness will result in lower fabrication cost. This will open a new frontier for modelling of metal oxide based thin films solar cells especially Cu2O thin films solar cells.
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