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Browsing by Subject "Gas sensing"

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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
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
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
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
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
Improving methane gas sensing properties of multi-walled carbonnanotubes by vanadium oxide filling

Author: Chimowa, George ; Tshabalala, Zamaswazi P ; Akande, Amos A ; Bepete, G ; Mwakikunga, Bonex W ; Ray, Suprakas S ; Benechada, EM Date: Aug 2017 Manipulation of electrical properties and hence gas sensing properties of multi-walled carbon nanotubes (MWNTs) by filling the inner wall with vanadium oxide is presented. Using a simple capillary technique, MWNTs are filled with vanadium ... Read more
LaBO3 (B¼ Fe, Co) nanofibers and their structural, luminescence and gas sensing characteristics

Author: Shingange, Katekani ; Swart, HC ; Mhlongo, Gugu H Date: Feb 2020 Perovskite based oxides provide various compositional combinations between different oxides for tuning gas sensing performances. Herein, we present lanthanum based perovskites (LaFeO3 and LaCoO3) nanofibers (NFs) synthesized through the ... Read more
Preferential adsorption of NH3 gas molecules on MWCNT defect sites probed using in situ Raman spectroscopy

Author: Chimowa, George ; Matsoso, B ; Coville, NJ ; Ray, Suprakas S ; Flahaut, E ; Hungria, T ; Datas, L ; Mwakikunga, Bonex W Date: Jun 2017 The preferential adsorption of NH(sub3) gas molecules on multi-walled carbon nanotubes (MWCNTs) was studied using in situ Raman spectroscopy. It was observed that the full widths at half maximum of the G band and the intensity ratio ... Read more
Reduction-oxidation of V2O5-WO3 nanostructured by ball milling and annealing: Their improved H2S gas sensing performance

Author: Bolokang, Amogelang S ; Motaung, David E Date: Apr 2019 Nanocrystalline composite VO(sub)2-WO(sub)3 powder was produced via mechanical milling (MM) and annealing. SEM images showed the formation of rod-shaped and hollow-shaped like structures surrounded by nanoparticles. Transmission electron ... Read more
Selective detection of propanol vapour at low operating temperature utilizing ZnO nanostructures

Author: Kortidis, Ioannis ; Lushozi, S ; Leshabane, N ; Nkosi, SS ; Ndwandwe, OM ; Tshilongo, J ; Ntsasa, N ; Motaung, David E Date: Sep 2019 We report on the propanol vapour (C3H8O) gas sensing characteristics of ZnO nanostructures prepared via hydrothermal assisted method. The ZnO-4h sensor showed a high response (i.e. resistance ratio), sensitivity and selectivity toward C3H8O ... Read more
Structural and optical properties of ZnO nanostructures grown by aerosol spray pyrolysis: candidates for room temperature methane and hydrogen gas sensing

Author: Motaung, DE ; Mhlongo, Gugu H ; Kortidis, I ; Nkosi, SS ; Malgas, GF ; Mwakikunga, Bonex W ; Ray, Suprakas S ; Kiriakidis, G Date: Aug 2013 We report on the synthesis of ZnO films by aerosol spray pyrolysis method at different deposition times.The surface morphology, crystal structure and the cross-sectional analysis of the prepared ZnO filmswere characterized by X-ray diffraction ... Read more
Wireless gas sensing in South African underground platinum mines

Author: Abu-Mahfouz, Adnan MI ; Isaac, Sherrin J ; Kruger, Carel P ; Niels Aakvaag, N ; Britta Fismen, B Date: Apr 2014 Approximately 70% of South African mines are classified as fiery, where methane gas potentially could cause explosions. The number of flammable gas reports and accidents are increasing steadily for both gold and platinum mines. However, there ... Read more

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