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Browsing by Author "Coville, NJ"

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Au-controlled enhancement of photoluminescence of NiS nanostructures synthesized via a microwave-assisted hydrothermal technique

Author: Linganiso, EC ; Mwakikunga, Bonex W ; Mhlanga, SD ; Coville, NJ Date: Nov 2014 Nickel sulphide (NiS) nanostructures decorated with gold (Au) nanoparticles (NPs) were synthesized via a microwave-assisted hydrothermal technique. Binary phase NiS (a and ß) crystalline nanostructures, bare, and decorated with Au NPs were ... Read more
The effect of reducing agents on the electronic, magnetic and electrocatalytic properties of thiol-capped Pt/Co and Pt/Ni nanoparticles

Author: Mathe, Ntombizodwa R ; Nkosi, SS ; Motaung, DE ; Scriba, Manfred R ; Coville, NJ Date: May 2015 The electronic, magnetic and electrocatalytic properties of bimetallic thiol-capped Pt/Co and Pt/Ni nanoparticles were synthesised using two reducing agents, NaBH(sub4) and N(sub2)H(sub4). X-ray diffraction analysis of the nanoparticles showed ... Read more
GaN nanostructures-poly(vinyl alcohol) composite based hydrostatic pressure sensor device

Author: Linganiso, EC ; Rodrigues, R ; Mhlanga, SD ; Mwakikunga, Bonex W ; Coville, NJ ; Hümmelgen, IA Date: Dec 2013 The wide band-gap semiconductor material gallium nitride was synthesized using a one step microwave-assisted solution phase technique. The synthesized GaN nanocrystals showed an intense ultraviolet-blue emission typical of GaN materials. ... Read more
In situ optical emission study on the role of C2 in the synthesis of singlewalled carbon nanotubes

Author: Motaung, DE ; Moodley, MK ; Manikandan, E ; Coville, NJ Date: 2010 Single-walled carbon nanotubes (SWCNTs) are unique one-dimensional nanostructure with extraordinary electronic, thermal, optical, and mechanical properties. These properties make SWCNTs suitable materials for a wide range of advanced technological ... Read more
Influence of bases on hydrothermal synthesis of titanate nanostructures

Author: Sikhwivhilu, LM ; Ray, SS ; Coville, NJ Date: Mar 2009 A hydrothermal treatment of titanium dioxide (TiO2) with various bases (i.e., LiOH, NaOH, KOH, and NH4OH) was used to prepare materials with unique morphologies, relatively small crystallite sizes, and large specific surface areas. The ... Read more
Methanol oxidation reaction activity of microwave irradiated and heat-treated Pt/Co and Pt/Ni nano-electrocatalysts

Author: Mathe, Ntombizodwa R ; Scriba, Manfred R ; Coville, NJ Date: Nov 2014 Bimetallic Pt nanoparticles were prepared by alloying Pt with the non-noble transition metals, Co and Ni, using a conventional heat-treatment (HT) method and microwaveirradiation (MW). The resulting samples were PteCo-Ht, PteNi-HT, PteCo, MW ... Read more
Microwave-irradiation polyol synthesis of PVP-protected Pt–Ni electrocatalysts for methanol oxidation reaction

Author: Mathe, Ntombizodwa R ; Scriba, Manfred R ; Rikhotso, Rirhandzu S ; Coville, NJ Date: 2017 Bimetallic Pt–Ni nanoparticles were synthesized for use as electrocatalysts for the methanol oxidation reaction using a cost-effective microwave-irradiation synthesis procedure that offers precise temperature control. By varying the concentration ... Read more
Nitrogen-doped carbon nanotubes as a metal catalyst support

Author: Mabena, LF ; Ray, SS ; Mhlanga, SD ; Coville, NJ Date: May 2011 The science and technology of catalysis is of fundamental importance to a national economy. Today about 90% of all technical chemicals are manufactured by the use of catalysts. Nanoparticles of noble metals are extremely important materials ... Read more
Novel Ni3S2 based room temperature humidity sensor and potential breath analyzer

Author: Linganiso, EC ; Coville, NJ ; Mwakikunga, Bonex W ; Mhlanga, SD ; Singh, T ; Fischer, T ; Mathur, S ; Linganiso, ZL ; Motaung, TE Date: 2019 Nanostructure based semiconductors have recently been considered for relative humidity (RH) monitoring due to their superior surface chemical properties when compared to their bulk counterparts. The RH sensing is measured by using a change ... Read more
Novel Ni3S2 based room temperature humidity sensor and potential breath analyzer

Author: Linganiso, EC ; Coville, NJ ; Mwakikunga, Bonex W ; Mhlanga, SD ; Singh, T ; Fischer, T ; Mathur, S ; Linganiso, ZL ; Motaung, TE Date: Jan 2020 Nanostructure based semiconductors have recently been considered for relative humidity (RH) monitoring due to their superior surface chemical properties when compared to their bulk counterparts. The RH sensing is measured by using a change ... 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
Raney copper catalysts for the water-gas shift reaction - II. Initial catalyst optimisation

Author: Mellor, JR ; Coville, NJ ; Sofianos, AC ; Copperthwaite, RG Date: 23 Dec 1997 The initial Raney copper WGS activity based on catalyst volume has been shown to be comparable to industrial and co-precipitated alternatives under varying reaction conditions. The presence of zinc oxide in the Raney copper structure was shown ... Read more
Raney copper catalysts for the water-gas shift reaction: I. Preparation, activity and stability

Author: Mellor, JR ; Coville, NJ ; Sofianos, AC ; Copperthwaite, RG Date: 23 Dec 1997 Characterisation of partially leached Raney copper catalysts demonstrated that the chemical nature of the reactant surface could be determined by controlling the leaching process. Initial water-gas shift (WGS) activity of the Raney copper ... Read more
Ruthenium supported on nitrogen-doped carbon nanotubes for the oxygen reduction reaction in alkaline

Author: Mabena, LF ; Modibedi, Remegia M ; Ray, Suprakas S ; Coville, NJ Date: Oct 2012 Nitrogen-doped carbon nanotubes (N-CNTs) prepared via thermal chemical vapor deposition (CVD), were used to support ruthenium (Ru) nanoparticles made using a microwave assisted reduction technique. The amount of Ru deposited on N-CNTs was ... Read more
Ruthenium supported on nitrogen-doped carbon nanotubes for the oxygen reduction reaction in alkaline electrolyte; Poster

Author: Mabena, LF ; Modibedi, Remegia M ; Ray, Suprakas S ; Coville, NJ Date: Jul 2012 The oxygen reduction reaction (ORR) at the cathode of fuel cells plays an important role in controlling the performance of a fuel cell but the poor kinetics of the ORR hinders this performance. Currently platinum-based metals are the best ... Read more
Size-dependent and intra-band photoluminescence of NiS2 nano-alloys synthesized by microwave assisted hydrothermal technique

Author: Linganiso, C ; Mhlanga, SD ; Coville, NJ ; Mwakikunga, Bonex W Date: Mar 2013 Synthesis of nickel disulfide (NiS2) nano-alloys capped and uncapped with hexadecylamine (HDA) was carried out. A cubic phase NiS2 formation was confirmed by X-ray diffraction (XRD) analysis. An average crystallite size of 35 nm was obtained ... Read more
Solid angles III. The role of conformers in solid angle calculations

Author: White, D ; Taverner, BC ; Coville, NJ ; Wade, PW Date: 14 Jun 1995 The values of the solid angles Omega for a range of commonly encountered ligands in organometallic chemistry (phosphines, phosphites, amines, arsines and cyclopentadienyl rings) have been determined. The solid angles were derived from a single ... Read more
Synthesis of single walled carbon nanotubes by dual laser vaporization

Author: Moodley, MK ; Coville, NJ ; Holloway, BC ; Maaza, M Date: Jul 2006 Single walled carbon nanotubes were synthesized by the laser vaporization of graphite composite targets in a tube furnace. Two pulsed Nd:Yag lasers operating at fundamental (1064 nm) and 2 nd harmonic (532 nm) were combined, focused and ... Read more
TEM and EELS studies of microwave-irradiation synthesis of bimetallic platinum nanocatalysts

Author: Mathe, Ntombizodwa R ; Coville, NJ ; Olivier, JE ; Scriba, Manfred R Date: 2014 Microwave-irradiation (MW) synthesis of nanostructured materials provides for the synthesis of metal nanoparticles, using fast and uniform heating rates. This procedure affords better control of the shape and size of the nanoparticles when ... Read more

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