A5055846013- Electrochemical Analysis and Applications
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Electrochemical sensors and biosensors
- Advanced biosensing and bioanalysis techniques
- Advanced Nanomaterials in Catalysis
- Analytical Chemistry and Sensors
- TiO2 Photocatalysis and Solar Cells
- Gas Sensing Nanomaterials and Sensors
- Biosensors and Analytical Detection
- Effects and risks of endocrine disrupting chemicals
- Copper-based nanomaterials and applications
- Electronic and Structural Properties of Oxides
- Water Quality Monitoring and Analysis
- Advanced Chemical Sensor Technologies
- Multiferroics and related materials
- Perovskite Materials and Applications
- RNA Interference and Gene Delivery
- CRISPR and Genetic Engineering
University of Johannesburg
2021-2025
Towards the engineering of semiconductors for improved visible light photoelectrochemical degradation organic pollutants in wastewater, we present preparation a Z-scheme heterojunction Bi2O2S and ZnO nanoparticles removal ciprofloxacin from wastewater. The Bi2O2S/ZnO nanocomposite was synthesised via an in-situ hydrothermal method deposited on FTO substrate to form photoanode. photoanodes were characterised with electron microscopy, XRD, photo-electrochemistry, photoluminescence, XPS UV/Vis...
Towards the photoelectrocatalytic degradation of ciprofloxacin, BFO/BVO heterojunction was constructed to improve performance individual semiconductors. The enhanced photoanode attributed increase in visible light harvesting, greater current mobility leading higher density, low charge transfer resistance, and recombination rate photogenerated electron hole. BFO, BVO photoanodes prepared were immobilized on fluorine doped tin oxide coated glass characterised using x-ray diffractometry,...
Silver nanoparticles (AgNPs) were synthesized separately and loaded onto the expanded layers of exfoliated graphite (EG) to form a silver nanoparticle-exfoliated nanocomposite (AgNPs-EG). The AgNPs-EG was compressed into pellet (0.6 cm in diameter) used prepare an electrochemical sensor for bisphenol A (BPA) standard samples thermal paper. materials characterized by ultraviolet–visible spectrophotometry, X-ray diffraction spectroscopy, scanning electron microscopy, energy-dispersive X-ray....
An electrochemical immunosensor for alpha-fetoprotein.
Abstract An electrochemical sensor for dopamine was developed by electrodepositing poly(propylene imine) (PPI) dendrimer and gold nanoparticles (AuNPs) onto a glassy carbon electrode (GCE). Electrochemical characterisation of the carried out cyclic voltammetry impedance spectroscopy in ferri/ferrocyanide electrolyte. The nanocomposite (GCE‐PPI‐AuNPs) showed improved electroactive surface area response over bare GCE. recorded detection limit 0.16 μM concentration range 0.1 to 125 μM. applied...
We report an alpha – fetoprotein (AFP) cancer biomarker electrochemical immunosensor detected on a carbon nanofiber (CNF) and gold nanoparticles (AuNPs) platform. Functionalised were immobilised through drop drying electrodeposition techniques respectively glassy electrode (GCE). AFP antibody was the platform overnight followed by blocking of nonspecific binding sites with bovine serum albumin (BSA) for 4 h. The antigen incubated 40 min at 35 °C interaction. CNF AuNPs characterised electron...
Dopamine is an important neurotransmitter and biomarker that plays a vital role in our neurological system body. Thus, it to monitor the concentration levels of dopamine bodies. We report aptamer-based sensor fabricated through electro-co-deposition generation 3 poly(propylene imine) (PPI) dendrimer gold nanoparticles (AuNPs) on glassy carbon (GC) electrode by cyclic voltammetry. Through self-assembly, single-stranded thiolated aptamer was immobilized GC/PPI/AuNPs prepare aptasensor....
Abstract A nanocomposite platform of silver nanoparticles and carbon nanofibres (AgCNFs) was used to immobilise a bisphenol specific 63‐mer ssDNA aptamer form biosensor. The fabrication process the biosensor studied with electrochemical impedance spectroscopy cyclic voltammetry in presence [Fe(CN) 6 ] 3−/4− as redox probe. detected linear range 0.1–10 nM, limit detection 0.39 nM using square wave (SWV). exhibited good selectivity interfering species at 100‐fold concentrations detect BPA real...
To develop a semiconductor interface with enhanced spatial separation of carriers under visible light irradiation for the photoelectrochemical (PEC) oxidation process, we explored fabrication Bi2O2S/NiTiO3 heterojunction photoanode removal sulfamethoxazole in water. The was synthesized via an situ hydrothermal and it exhibited better absorption charge separation, as well reduced rate recombination photoexcited species compared to pristine Bi2O2S NiTiO3. improved photoelectrocatalytic...
Electrodeposited bismuth ferrite (BiFeO3) thin films on fluorine-doped tin oxide (FTO) substrate were employed as photoanodes in the photoelectrocatalytic degradation of methylene blue. The BiFeO3 electrodeposited for 300 s, 600 1200 1800 s and 3600 characterised with XRD, field emission scanning electron microscopy (FESEM) UV-vis diffuse reflectance spectroscopy. SEM images displayed different morphology at electrodeposition times which affects (PEC) performances. FESEM cross-sectional area...
Towards the nicotine addiction challenge in smoking of hookah pipe products, we hereby present development an electrochemical sensor for detection. A nitrogen-doped carbon nanosheet (N-CNS)/poly(amidoamine) dendrimer (PAMAM) nanocomposite-modified electrode was prepared as a detection analytical and real samples. The N-CNSs were by hydrothermal method dropcast on glassy followed electro-deposition PAMAM to form (GCE/N-CNSs/PAMAM). characterized with electron microscopy, Raman spectroscopy...