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Browsing by Subject "Ferromagnetism"

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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
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
Defect-induced room temperature ferromagnetic properties of the Al-doped and undoped ZnO rod-like nanostructure

Author: Jule, L ; Dejene, F ; Ali, AG ; Roro, Kittessa T ; Mwakikunga, Bonex W Date: Jul 2017 In this work, electron paramagnetic resonance (EPR) experiment on undoped ZnO and Al doped ZnO (AZO) nanoparticles prepared by facile sol–gel method were investigated. The effects of the Al concentration on room temperature ferromagnetic (FM) ... Read more
Induced ferromagnetic and gas sensing properties in ZnO-nanostructures by altering defect concentration of oxygen and zinc vacancies

Author: Motaung, DE ; Makgwane, Peter R ; Ray, SS Date: Jan 2015 We report on the effect of the synthesis reaction-time on the structural, optical, magnetic and sensing properties of ZnO-nanostructures. Electron paramagnetic resonance and photoluminescence analyses reveal that singly ionized oxygen vacancies ... Read more
Investigation of physicochemical properties of Ag doped ZnO nanoparticles prepared by chemical route

Author: Gayathri, S ; Ghosh, OSN ; Sathishkumar, S ; Sudhakara, S ; Jayaramudu, J ; Ray, SS ; Viswanath, AK Date: Dec 2015 In this report we have demonstrated the synthesis of silver doped and pure ZnO nanoparticles using facile chemical precipitation method. The crystal structure, optical and magnetic properties of the synthesized nanocrystals were determined ... Read more
Room temperature ferromagnetism and gas sensing in ZnOnanostructures: Influence of intrinsic defects and Mn, Co, Cu doping

Author: Mhlongo, Gugu H ; Shingange, Katekani ; Tshabalala, Zamaswazi P ; Dhonge, Baban, P ; Mahmoud, FA ; Mwakikunga, Bonex W ; Motaung, David E Date: Dec 2016 Undoped and transition metal (Cu, Co and Mn) doped ZnO nanostructures were successfully prepared via a microwave-assisted hydrothermal method followed by annealing at 500 °C. Numerous characterization facilities such as X-ray powder diffraction ... Read more

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Browsing by Subject "Ferromagnetism"

Browsing by Subject "Ferromagnetism"

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