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Browsing by Author "Mhlongo, Gugu H"

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Analysis of the structure, particle morphology and photoluminescent properties of ZnS:Mn2+ nanoparticulate phosphors

Author: Raleaooa, PV ; Roodt, A ; Mhlongo, Gugu H ; Motaung, David E ; Ntwaeaborwa, OM Date: Jan 2018 The structure, particle morphology and photoluminescent properties of n(sup2+) doped ZnS nanoparticles are reported. The X-ray powder diffraction studies showed that incorporation of Mn(sup2+) did not cause any change to the crystallized cubic ... Read more
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
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
Comparative study: the effect of annealing conditions on the properties of P3HT:PCBM blends

Author: Motaung, DE ; Malgas, GF ; Nkosi, SS ; Mhlongo, Gugu H ; Mwakikunga, Bonex W ; Malwela, T ; Arendse, CJ ; Muller, TFG ; Cummings, FR Date: Feb 2013 This paper presents a detailed study on the role of various annealing treatments on organic poly(3-hexylthiophene) and [6]-phenyl-C(sub61)-butyric acid methyl ester blends under different experimental conditions. A combination of analytical ... 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
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 ultra-high sensitive and selective CH4 room temperature gas sensing of TiO2nanorods: Detailed study on the annealing temperature

Author: Tshabalala, Zamaswazi P ; Shingange, Katekani ; Dhonge, Baban, P ; Ntwaeaborwa, OM ; Mhlongo, Gugu H ; Motaung, David E Date: Jul 2016 Applications of ultra-highly sensitive and selective methane (CH(sub4)) room temperature gas sensors are important for various operations especially in underground mining environment. Therefore, this study is set out to investigate the effect ... Read more
Facile synthesis of improved room temperature gas sensing properties of TiO2 nanostructures: Effect of acid treatment

Author: Tshabalala, Zamaswazi P ; Motaung, David E ; Mhlongo, Gugu H ; Ntwaeborwa, OM Date: Mar 2016 TiO2 nanoparticles were synthesized via a simple hydrothermal method in a sodium hydroxide (NaOH) aqueous solution and washed with distilled water and different concentrations of hydrochloric acid which acted as the morphological/crystallographic ... Read more
Facile synthesis of improved room temperature gas sensing properties of TiO2 nanostructures: Effect of acid treatment

Author: Tshabalala, Zamaswazi P ; Motaung, David E ; Mhlongo, Gugu H ; Ntwaeborwa, OM Date: Mar 2016 TiO(sub2) nanoparticles were synthesized via a simple hydrothermal method in a sodium hydroxide (NaOH) aqueous solution and washed with distilled water and different concentrations of hydrochloric acid which acted as the morphological/cryst ... Read more
Hierarchically Porous Cu-, Co-, and Mn-Doped Platelet-Like ZnO Nanostructures and their Photocatalytic Performance for Indoor Air Quality Control

Author: Papadaki, D ; Mhlongo, Gugu H ; Motaung, David E ; Nkosi, Steven S ; Panagiotaki, KP ; Christaki, E ; Assimakopoulos, MN ; Papadimitriou, VC ; Rosei, F ; Kiriakidis, G ; Ray, Suprakas S Date: Sep 2019 Several parameters, including specific surface area, morphology, crystal size, and dopant concentration, play a significant role in improving the photocatalytic performance of ZnO. However, it is still unclear which of these parameters play ... 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
The influence of Pr3+ co-doping on the photoluminescence and cathodoluminescence properties of SiO2:Eu3+/Tb3+

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Ntwaeaborwa, OM ; Swart, HC ; Hillie, KT Date: Jul 2011 Tb3+-Pr3+, and Eu3+-Pr3+ ion pairs co-doped in a SiO2 matrix were prepared by a sol-gel method. Co-doping of Eu3+ and Tb3+ ions with Pr3+ in SiO2 resulted in the quenching of Eu3+ and Tb3+ emissions with increasing Pr3+ concentrations. The ... Read more

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