Prof

Revaprasadu, Neerish

Faculty: Faculty of Science, Agriculture and Engineering

ORCID: https://orcid.org/0000-0001-5730-1232

Research Interest(s): Nanotechnology, Nanomaterials, Electrocatalysis.

Active Research Project(s): NRF/SASOL NIMPO Incentive Grant

Active Community Engagement: ASSAF, RSC, and SACI

Biography: Neerish Revaprasadu is a Senior Professor of Chemistry and former SARChI Chair holder in Nanotechnology at the University of Zululand, South Africa. He obtained my B.Sc. (Hons.) from the University of Natal in 1993 and his PhD from Imperial College, London in 2000. He started as a Senior Lecturer at UNIZULLU in 2000 promoted to Associate Professor in 2004, and full Professor in 2009. In 2007, I was awarded the DST/NRF SARCHi research chair in Nanotechnology. He has taught undergraduate and postgraduate courses. These include General Chemistry (1st year), Analytical Chemistry (2nd, 3rd and Hons), Inorganic Chemistry (3rd year and Hons), and has supervised 15 postdocs, 20 PhD, and 16 MSc students. Professor Revaprasadu has published 240 articles in peer-reviewed journals, 25 book chapters, and attended 80 national and international conferences. He has been the editor of the SPR Nanoscience book series (Vol. 4-7) published by the Royal Society of Chemistry since 2016, and also the associate editor of the Nanoscience and Nanotechnology RSC book series. He was elected a Member of the South African Academy of Science (ASSAF) in 2014.

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Crystal structures and physicochemical studies of some novel divalent and trivalent transition metal chelates of N-morpholine-N’-benzoylthiourea
Revaprasadu,Neerish; Ketchemen, Kevin I.Y.
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Khan, Malik Dilshad Mlowe, Sixberth Akerman, Matthew P.Vitorica-Yrezabal, Inigo Whitehead, George Nyamen, Linda D.Ndifon, Peter T.O’Brien, Paul
2021
| Elsevier
A series of Fe(III), Co(III), Ni(II), Cu(II), Zn(II) and In(III) N-morpholine-N'-benzoyl thiourea complexes have been synthesized and characterized by elemental analysis, thermal analysis, infrared spectroscopy, 1H nuclear magnetic resonance spectroscopy and single-crystal X-ray crystallography. Thermogravimetric analysis shows that all the complexes undergo a two-step decomposition process except for the iron(III) complex and the indium(III) complexes, which show three-step and one-step decompositions, respectively. The complexes are thermally stable up to approximately 300°C. The ligand coordinates the various metal ions in a bidentate (L-kO,S) chelating mode, facilitated by deprotonation of the acidic amide (–C(O) N'HC (S)) moiety. This mode of coordination allows for the facile formation of neutral bis/tris-6-membered chelates of type [M(L-kS,O)x] where x = 2 or 3 for divalent or trivalent metal ions, respectively.
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Comparative study on the effect of precursors on the morphology and electronicproperties of CdS nanoparticles
Revaprasadu,Neerish; Ndifon, Peter T.
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Nyamen, Linda D.Mlowe, Sixberth Ketchemen, Kevin I. Y.
2021
| Scientific and Techn...
Cadmium dithiocarbamate and cadmium ethyl xanthate complexes were synthesized and characterized by microanalysis, Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analyses. The complexes were employed as molecular precursors for the fabrication of CdS nanoparticles in hexadecylamine (HDA) and oleylamine (OLA) at a temperature of 250 C. Spherical and oval shaped particles with sizes ranging from 9.93±1.89 to 16.74±2.78 nm were obtained in OLA while spherical, oval and rod shaped particles with sizes ranging from 9.40±1.65 to 29.90±5.32 nm were obtained in HDA. Optical properties of the nanoparticles showed blue shifts as compared to the bulk CdS, with the OLA capped nanoparticles slightly more blue shifted than the corresponding HDA capped nanoparticles. Results of crystallinity patterns revealed hexagonal phase of CdS.
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Molecular precursor route for the phase selective synthesis of α-MnS or metastable γ-MnS nanomaterials for magnetic studies and deposition of thin films by AACVD
Revaprasadu,Neerish; Tigwerea, Gervais A.
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Khan, Malik Dilshad Nyamen, Linda D.Aboud, Ahmed A.Moyo, Thomas Dlamini, Sanele T.Ndifon, Peter T.
2022
| Elsevier
Heterocyclic dithiocarbamate complex of manganese and the adducts of the complex with 1,10-phenanthroline and 2,2-bipyridyl respectively were synthesized and characterized. The complexes were used as single-source precursors for the preparation of MnS nanoparticles via thermolysis in oleylamine (OLA) and dodecanethiol (DT). The optimized reaction parameters have resulted in the formation of α-MnS and γ-MnS nanoparticles depending on the dispersion medium and the nature of the precursor. The same precursors were also used for the deposition of MnS thin films by the aerosol-assisted chemical vapour deposition (AACVD) method in varying solvents and temperatures. The morphology and phase of the synthesized nanoparticles were shown to be affected by the precursor type and the nature of the surfactants. TEM images show the formation of nanoparticles of various morphologies ranging from spherical monodispersed to large elongated pointed rods, depending on the precursor type. SEM images showed that the morphology of the deposited thin films is affected by precursor type and the deposition temperature. Worm-like to rod-like films were observed on TEM images at 350 ◦C, which changes to spherical or cubic films at 450 ◦C. Magnetic measurements at room temperature showed the α-MnS and γ-MnS nanoparticles in paramagnetic states due to Mn2+moments. The susceptibility for the γ-phase is at least double that of the α-phase. Finite and small hysteretic effects in low fields are indicative of small ordered antiferromagnetic phases due to negative exchange interaction between Mn2+ions.
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Revaprasadu, Neerish

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