A5041412289- Analytical Chemistry and Sensors
- Advanced Chemical Sensor Technologies
- Gas Sensing Nanomaterials and Sensors
- Advanced Memory and Neural Computing
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor materials and devices
- Carbon Nanotubes in Composites
- Conducting polymers and applications
- Advanced Photocatalysis Techniques
- Neurological diseases and metabolism
- Fullerene Chemistry and Applications
- Neuroscience and Neural Engineering
- Advanced Sensor and Energy Harvesting Materials
- Porphyrin Metabolism and Disorders
- RNA regulation and disease
- Organometallic Complex Synthesis and Catalysis
- TiO2 Photocatalysis and Solar Cells
- Advanced Thermoelectric Materials and Devices
- Graphene research and applications
- Polymer Nanocomposite Synthesis and Irradiation
- Carbon and Quantum Dots Applications
- Spectroscopy and Chemometric Analyses
- 2D Materials and Applications
- Mycotoxins in Agriculture and Food
University of Johannesburg
2014-2024
University of the Witwatersrand
2004-2023
Universidade Federal do Paraná
2011-2014
Washington University in St. Louis
1990
Neodymium, nitrogen, and sulfur tridoped titania (Nd,N,S-TiO2) was decorated on reduced graphene oxide (rGO) multiwalled carbon nanotubes (MWCNTs) via a simple sol–gel method. The prepared photocatalysts were characterized by FE-SEM-EDX, TEM, UV–vis, BET, FTIR, Raman, XRD. Aqueous solutions of eriochrome black T (EBT) eosin blue shade (EBS) used to evaluate the photocatalytic activity composites under simulated solar light irradiation. Degradation dyes performed in single mixed dye...
Zeolitic imidazolate framework-67 (ZIF-67), carbon nanoparticles (CNPs), and the CNPs@ZIF-67 composite were prepared used to fabricate sensors for detection of acetone vapour. The materials characterized using transmission electron microscopy, powder X-ray diffraction, photoelectron spectroscopy, Raman spectroscopy Fourier-transform infrared spectroscopy. tested an LCR meter under resistance parameter. It was found that ZIF-67 sensor did not respond at room temperature, CNP had a non-linear...
We demonstrate semi-metallic transport in graphene oxide layers treated with an organic acid through a nearly linear current-vs.-voltage relationship and the weak temperature dependence of resistance from high temperatures down to 20 K. Additionally energy gap was observed below 17 K due formation local barriers by residual oxygen groups disorder reduced (RGO) sheets. At higher shows negative T2 dependence. Temperature dependent magnetization measurements showed phase transition diamagnetic...
Diethylamine vapor is harmful to people if inhaled or swallowed, as it results in the oxidation of hemoglobin body into unwanted methemoglobin, which unable transport oxygen blood, resulting reduced blood oxygenation. Lack oxygenation leads hypoxemia. MnO2 nanorods, carbon soot, and MnO2@ZIF-8 are sensing materials used prepare solid-state gas sensors that operate at room temperature. The prepared were characterized by scanning electron microscopy, transmission powder X-ray diffraction,...
This study investigated the application of a hybrid nanocomposite tin oxide nanorods (SnO2 NRs) and graphene (GO) for chemoresistive detection some volatile compounds (hexanal, benzaldehyde, octanal, 1-octanol, ethyl acetate vapours) emitted by Aspergillus flavus under simulated conditions. The synthesised materials were characterised using various analytical techniques, including high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), Raman...
We investigate the chemical sensing behavior of composites prepared with polyvinyl alcohol and carbon materials (undoped multiwalled nanotubes, nitrogen-doped nanotubes nanocoils). determine sensitivity thin films these for ethanol, methanol toluene vapor, comparing their conductance capacitance responses. The composite that exhibits highest depends on specific vapor concentration measured electrical response, showing interactivity structure species depend structural specificities doping.
This study identified and monitored the levels of aflatoxins (B
Functionalized C60 was reacted with 3-hexylthiophene in the presence of FeCl3 to produce a copolymer (P3HT-C60) containing units as main chain, side groups. Gold nanoparticles (AuNPs) were synthesized poly(3-hexylthiophene) (P3HT), or P3HT-C60 copolymer, using two-phase, one–pot reaction involving reduction HAuCl4 by NaBH4. This approach resulted formation nanocomposites where AuNPs are directly stabilized P3HT P3HT-C60. All materials characterized UV–vis absorption and fluorescence...
We report the preparation of write-once-read-many times memory devices using composites carbon nanotubes and poly(vinyl phenol) sandwiched between Al electrodes. Three types (undoped multiwalled nanotubes, nitrogen-doped boron-doped nanotubes) are investigated for this application. The OFF to ON state switching threshold is only slightly dependent on nanotube type, but ON/OFF current ratio depends both type concentration varies up 106, decreasing concentrations larger than 0.50 wt% in composite.