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Browsing by Author "Swart, HC"

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Au functionalized ZnO rose-like hierarchical structures and their enhanced NO2 sensing performance

Author: Shingange, Katekani ; Swart, HC ; Mhlongo, Gugu H Date: Apr 2018 Herein, we present ZnO rose-like hierarchical nanostructures employed as support to Au nanoparticles to produce Au functionalized three dimensional (3D) ZnO hierarchical nanostructures (Au/ZnO) for NO2 detection using a microwave-assisted ... Read more
The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature

Author: Mokoena, Teboho P ; Tshabalala, Zamaswazi P ; Hillie, Kenneth T ; Swart, HC ; Motaung, DE Date: Sep 2020 The detection of hazardous and toxic gases in homes and corporate world, with highly sensitive and selective manner continues to be of great interest. Therefore, we report on the gas sensing characteristics of NiO nanostructures with crystallite ... Read more
Cathodoluminescence properties of SiO2:Pr3+and ZnO.SiO2:Pr3+ phosphor nanopowders

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Dhlamini, MS ; Swart, HC ; Hillie, KT Date: Oct 2010 The successful incorporation of ZnO nanoparticles in Pr3+-doped SiO2 using a sol–gel process is reported. SiO2:Pr3+ gels, with or without ZnO nanoparticles, were dried at room temperature and annealed at 600 °C. On the basis of the X-ray ... Read more
Characteristics of point defects on the room temperature ferromagnetic and highly NO2 selectivity gas sensing of p-type Mn3O4 nanorods

Author: Kortidis, Ioannis ; Swart, HC ; Ray, Suprakas S ; Motaung, David E Date: Apr 2019 This study investigates the room temperature (RT) gas-sensing and ferromagnetic behavior of p-type materials based on a comparison of NiO, Mn3O4, and CuO nanostructures prepared using a hydrothermal method. The Mn3O4 nanorods based sensor ... Read more
Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours

Author: Mokoena, Teboho P ; Swart, HC ; Hillie, Kenneth T ; Motaung, DE Date: Mar 2021 Propanol and benzene, toluene, ethylenebenzene and xylene (BTEX) vapours are within the volatile organic compounds (VOCs) family and are utilized in industrial and petroleum goods, are greatly toxic in human health and environment. Therefore, ... Read more
A comprehensive comparison study on magnetic behaviour, defects-related emission and Ni substitution to clarify the origin of enhanced acetone detection capabilities

Author: Nemufulwi, Murendeni I ; Swart, HC ; Mhlongo, Gugu H Date: Jul 2021 In this work, nickel (Ni) substituted zinc ferrite nanoparticles (NPs) with formula NixZn1- xFe2O4 (x = 0, 0.1, 0.3, 0.4) were synthesized using a microwave-assisted hydrothermal method. We further evaluated the effects of Ni substitution on ... Read more
Concentration effect of Tm3+ on cathodoluminescence properties of SiO2: Tm3+ and SiO2:Ho3+, Tm3+ systems

Author: Dhlamini, MS ; Mhlongo, Gugu H ; Swart, HC ; Ntwaeaborwa, OW ; Hillie, KT Date: May 2012 Cathodoluminescence (CL) properties of SiO2 powders activated with thulium (Tm3+) and holmium (Ho3+) ions prepared by a sol–gel process were investigated. Different molar concentrations of Tm3+ co-doped with Ho3+ were studied. The 460 nm ... Read more
Defect-induced magnetism in undoped and Mn-doped wide band gapzinc oxide grown by aerosol spray pyrolysis

Author: Motaung, DE ; Kortidis, I ; Papadaki, D ; Nkosi, SS ; Mhlongo, Gugu H ; Wesley-Smith, J ; Malgas, GF ; Mwakikunga, Bonex W ; Coetsee, E ; Swart, HC ; Kiriakidis, G ; Ray, SS Date: Aug 2014 We present a systemic study on the structural, optical and magnetic properties of the un-doped and Mn doped ZnO thin films grown by aerosol spray pyrolysis at different deposition times. XRD profilinghas shown that the structures of the ... Read more
Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Swart, HC ; Ntwaeaborwa, OM ; Hillie, KT Date: Aug 2011 Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol–gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main ... Read more
Design of porous p-type LaCoO3 nanofibers with remarkable response and selectivity to ethanol at low operating temperature

Author: Shingange, Katekani ; Swart, HC ; Mhlongo, Gugu H Date: Apr 2020 This work reports on the fabrication of remarkably selective and sensitive LaCoO3 nanofibers (NFs) based sensors obtained after annealing at different temperatures of 550, 650, and 700 °C. Findings from field emission scanning electron and ... Read more
Design of porous p-type LaCoO3 nanofibers with remarkable response and selectivity to ethanol at low operating temperature

Author: Shingange, Katekani ; Swart, HC ; Mhlongo, Gugu H Date: Apr 2020 This work reports on the fabrication of remarkably selective and sensitive LaCoO3 nanofibers (NFs) based sensors obtained after annealing at different temperatures of 550, 650, and 700 °C. Findings from field emission scanning electron and ... Read more
Detailed understanding on the relation of various pH and synthesis reaction times towards a prominent low temperature H2S gas sensor based on ZnO nanoplatelets

Author: Kortidis, Ioannis ; Swart, HC ; Ray, Suprakas S ; Motaung, David E Date: Mar 2019 An unceasing scientific challenge to monitor the emissions of toxic and flammable gases in a selective approach is of great importance for safety of human health. As a result, herein, we report on the detailed study of the gas sensing ... Read more
Effects of Ce3+ concentration, beam voltage and current on the cathodoluminescence intensity of SiO2: Pr3+–Ce3+ nanophosphor

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Dhlamini, MS ; Swart, HC ; Hillie, KT Date: Feb 2011 SiO2:Pr3+–Ce3+ phosphor powders were successfully prepared using a sol–gel process. The concentration of Pr3+ was fixed at 0.2 mol% while that of Ce3+ was varied in the range of 0.2–2 mol%. High resolution transmission electron microscopy ... Read more
Energy transfer between doubly doped Er3+, Tm3+and Ho3+ rare earth ions in SiO2 nanoparticles

Author: Dhlamini, MS ; Mhlongo, Gugu H ; Swart, HC ; Hillie, KT Date: Apr 2011 Preparation of Er3+, Ho3+ and Tm3+ ions co-doped SiO2 nanoparticle phosphor powders by sol gelmethod is reported. The morphology and the particle size of the SiO2 hostmatrix were confirmed by field emission scanning electron microscopy (FESEM). ... Read more
Enhanced exciton emission from ZnO nano-phosphor induced by Yb3+ ions

Author: Kabongo, GL ; Mhlongo, Gugu H ; Mothudi, BM ; Hillie, KT ; Swart, HC ; Dhlamini, MS Date: 2014 In this work, the sol–gel method was used to prepare Ytterbium (Yb(sup3+)) doped ZnO nano-phosphors with different concentrations of Yb(sup3+) ions. Their structural, morphological, photoluminescence, electronic states and the chemical ... Read more
Fabrication of a propanol gas sensor using p-type nickel oxide nanostructures: The effect of ramping rate towards luminescence and gas sensing characteristics

Author: Mokoena, Teboho P ; Hillie, Kenneth T ; Swart, HC ; Leshabane, N ; Tshilongo, J ; Motaung, DE Date: Oct 2020 We report on the effect of the annealing temperature ramping rate on the gas sensing performance towards n-propanol gas and the luminescence properties using p-type NiO gas sensors prepared by the hydrothermal method and annealed at various ... Read more
Grain structure orientational change in Ti6Al4V alloys induced by sea water quenching and novel stress relief annealing process

Author: Bolokang, Amogelang S ; Mathabathe, Maria N ; Motaung, DE ; Arendse, CJ ; Swart, HC Date: Mar 2023 We report on the microstructures and properties of Ti6Al4V alloys, which were achieved upon quenching in sea water medium with potential high cooling rate. The Ti6Al4V alloys were quenched at 1000 and 1100 °C, respectively. Moreover, the ... Read more
A highly responsive NH3 sensor based on Pd-loaded ZnO nanoparticles prepared via a chemical precipitation approach

Author: Mhlongo, Gugu H ; Motaung, David E ; Cummings, FR ; Swart, HC ; Ray, Suprakas S Date: Jul 2019 The gas-detecting ability of nanostructured ZnO has led to significant attention being paid to the development of a unique and effective approach to its synthesis. However, its poor sensitivity, cross-sensitivity to humidity, long response/recovery ... Read more
Improved sensitivity and selectivity of pristine zinc oxide nanostructures to H2S gas: Detailed study on the synthesis reaction time

Author: Motaung, David E ; Mhlongo, Gugu H ; Bolokang, Amogelang S ; Dhonge, Baban P ; Swart, HC ; Ray, Suprakas S Date: Nov 2016 The gas sensing properties of ZnO nanostructures synthesized at various reaction times are reported in this study. The response of ZnO nanostructures to H(sub2), NH(sub3), H(sub2)S and NO(sub2) gases was investigated at different operating ... Read more
In depth study on the notable room-temperature NO2gas sensorbased on CuO nanoplatelets prepared by sonochemical method: Comparison of various bases

Author: Oosthuizen, Dina N ; Motaung, David E ; Swart, HC Date: Aug 2018 The strategy for the synthesis of metal oxide nanostructured based sensors that operate at room temperature with higher sensitivity and selectivity facilitates the forecasts towards low cost and power consumption gas sensors which will be ... Read more

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