Omolola E Fayemi

North West University, Mafikeng South Africa · Chemistry

This study aimed to compare the spectroscopy, morphological, electrocatalytic properties, and antibacterial activities of cobalt nanoparticles (CoNPs) with nickel nanoparticles (NiNPs). Cobalt nanoparticles and NiNPs were prepared via a chemical reduction approach and characterized utilizing transmission electron microscopy (TEM), energy-dispersive...

The high mortality and morbidity resulting from an increasing incidence of antibiotic resistance among pathogens highlight a crucial need for the development of novel alternative therapy. In the quest for alternative therapy, this study was conducted to synthesise nanoparticles (NPs) from ferric chloride hexahydrate (FeCl3.6H2O) via Melia azedarach...

In this study, a novel electrodeposition of poly(2,4,6‐trihydroxybenzaldehyde) on bare glassy carbon electrode for dopamine detection was reported. 2,4,6‐trihydroxybenzaldehyde and the electrodeposited poly(2,4,6‐trihydroxybenzaldehyde) were characterized using Fourier transform‐infrared spectroscopy, UV‐visible spectroscopy, and scanning electron...

The electrochemical oxidation of pyrene, a well-known polycyclic aromatic hydrocarbon, was investigated using a glassy carbon electrode (GCE) modified with nanocomposite of copper oxide nanoparticles incorporated functionalized multi-walled carbon nanotubes (fMWCNTs). The catalytic copper oxide nanoparticles (CuONPs) synthesized through a chemical...

In this study, carbon quantum dots (Cdots) synthesized from a pencil graphite precursor using a bottom-up method were incorporated into polyaniline (PANI) to form Cdots-PANI nanocomposite. Cdots, PANI and Cdots-PANI nanocomposites were characterized using the Fourier-Transform infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-vis), X-ray d...

Bromate in food and water has been linked to cancer risks for lifetime exposures, and the present techniques for its detection have significant limitations that necessitate the development of new and more efficient approaches. The study describes the synthesis and characterization of CoPcMWCNTs nanocomposites before modifying a glassy carbon electr...

Solar-blind ultraviolet photodetectors have attracted great attention owing to the low background noise and high reliability in operation environments. In this work, we regulated crystallization of Cs3Cu2I5 film and passivated...

Signal amplification is vitally important for sensing low‐dose X‐rays in medical diagnosis by amplifying the generated electric read‐out signal. However, the complexity of external amplification circuits hampers device miniaturization and portability, while integrating amplification functionality directly into sensors or detectors remains a signifi...

Compared with the pure lead-based MAPbBr3 (MA = CH3NH3) perovskite single crystals (PSCs), tin–lead alloy (MAPbxSn1−xBr3) PSCs with higher carrier mobility and longer carrier lifetime are expected to perform as better-quality ionization radiation detectors. In this work, we design MAPbBr3–MAPb0.9Sn0.1Br3–MAPb0.8Sn0.2Br3 structure detectors by emplo...

Low‐cost and efficient large‐scale triboelectric nanogenerator (TENG) is considered as the new scheme for distributed mechanical conversion or renewable energy utilization. An extremely popular all‐inorganic lead‐free double perovskite Cs2AgBiBr6 (CABB) has emerged as extraordinary potential material in triboelectric semiconductors’ substitution, o...

A sensitive bromate sensor was developed using nickel phthalocyanine multi-walled carbon nanotubes nanocomposite modified on a glassy carbon electrode. The NiPcMWCNTs nanocomposite was prepared from nickel nanoparticles, phthalocyanine, and functionalized MWCNTs via ultrasonication. UV–visible spectroscopy, SEM, XRD, TEM, and EDX techniques were us...

Ionic Liquids: Eco-friendly Substitutes for Surface and Interface Applications explores the growing interest in utilizing ionic liquids as sustainable alternatives for various industrial and biological applications. With their unique properties and environmentally friendly nature, ionic liquids have emerged as promising substitutes for toxic and vo...

Inhibition of metallic degradation using organic compounds has been established as a viable method for controlling corrosion rate. However, the literature study reveals that synthetic organic inhibitors are often expensive and inimical to the environment. Starch, a potential substitute, is a naturally abundant biopolymer that has attracted much int...

Dihydroxybenzenes (DBZs) are one of the major classes of pollutants in water bodies. The devastating effects of DBZs on human health when consumed through potable water intake include cancer, liver disease, and neurodegenerative diseases. Accordingly, analytical methods such as colorimetry, fluorimetry, chemiluminescence, and electrochemical sensin...

Low-cost, handily prepared, and efficient large-scale triboelectric nanogenerator (TENG) is considered as the new scheme for distributed mechanical conversion or renewable blue energy utilization. Semiconductors with high carrier mobility introduction potency overcome pure polymer restriction for uncompetitive short current density. An extremely po...

This study described the antimicrobial activities of waste biomass-mediated Cu2O/ZnO bi-oxide (BiO) nanocomposites; The Orange peels extract (OPE), and lemon peels extract (LPE), were used to synthesize the bioxide nanoparticles (NPs) designated as OPE/BiONPs, and LPE/BiONPs respectively, and characterized with X-ray diffraction (XRD), and zeta pot...

Copper oxide (CuO) nanoparticles were synthesized using the chemical and green method routes and doped with polyaniline (PANI) to form PANI/CuO ch and PANI/CuO gr nanocomposite. The microstructural properties of the nanocomposites were characterized by UV–Vis spectroscopy (UV), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR)...

This chapter discussed the production and corrosion inhibiting properties of carbon nanotubes (CNTs). The preparation of the notable forms of CNTs such as the single-walled CNTs and multiwalled CNTs extensively used for the protection of industrial metallic materials against corrosion was also discussed in this chapter. Arc-discharge, laser ablatio...

Corrosion phenomenon is a widely investigated subject because of the unfavorable impact it has on humans and the environment. Among these unfavorable impacts are huge financial losses due to breakdown of industrial plants, loss of properties and human lives due to structural collapse, and environmental pollution caused by corroded pipes. Over the y...

Single-crystalline perovskites with low trap density, high mobility, and long diffusion length are ideal for creating high-performance optoelectronic devices. However, growing mixed-halide single-crystalline perovskite films or wafers with arbitrary halide...

Diarrhea is a condition in which feces is discharged from the bowels frequently and in a liquid form. It is one of the frequent causes of morbidity and mortality in developing countries. The impact of Diarrhea is worsened by the increasing incidence of antimicrobial resistance among the causative agents, and this is now categorized as a global heal...

The present study reports the quantum chemical studies and quantitative structure activity relationship (QSAR) modeling of thirty ionic liquids utilized as chemical additives to repress mild steel degradation in 1.0 M HCl. Five molecular descriptors obtained from standardization of calculated descriptors together with the inhibitor concentration we...

Cobalt phthalocyanine multiwalled carbon nanotubes (CoPc-MWCNTs), a nanocomposite, are extraordinary electrochemical sensing materials. This material has attracted growing interest owing to its unique physicochemical properties. Notably, the metal at the center of the metal phthalocyanine structure offers an enhanced redox-active behavior used to d...

This work describes the fabrication and application of a sensor based on green carbon quantum dots/copper oxide nanocomposite for dopamine (DA) detection. The characterization of the copper oxide nanoparticles (CuO NPs), green carbon quantum dots prepared from banana peels (gCQDs), and their composite (gCQDs/CuO) was effected through Fourier Transf...

Herein, we report the electropolymerization of crystal violet (CRV) on a bare glassy carbon electrode (GCE) for the detection of adrenaline (AD). Electropolymerization parameters such as electrolyte pH, scan rate and monomer concentrations were optimized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The characteriz...

Antibiotics are regularly used in animal husbandry to treat diseases. This practice is beneficial to animals’ health and helps ensure food security. However, the misuse of antibiotics, especially in food-producing animals, has resulted in the advent of antimicrobial resistance (AMR) and its dissemination among foodborne pathogens. The occurrence of...

Nanostructured carbon allotropes are sought-after materials of interest in several fields. These nanostructures have shown great prospects in the development of efficient, cost-effective and environmentally benign corrosion inhibitors for use in several industries. Their associated facile synthesis, low cost, outstanding anticorrosive properties, a...

The safety of water resources throughout the globe has been compromised by various human activities and climate change over the last decades. Consequently, the world is currently confronted with a severe shortage of water supply and a water safety crisis, amidst a growing population. With poor environmental regulations, indiscriminate budding of ur...

Pyrimidine compounds have proven to be effective and efficient additives capable of protecting mild steel in acidic media. This class of organic compounds often functions as adsorption-type inhibitors of corrosion by forming a protective layer on the metallic substrate. The present study reports a computational study of forty pyrimidine compounds t...

Nanocrystalline brownmillerite Ca 2 Fe 2 O 5 (CFO) has been prepared by sol-gel technique and the samples are presented as CFO1 and CFO2, for the products obtained at calcination temperatures of 600, and 800 ℃ respectively. The particles were characterized using optical and structural techniques, and were further evaluated for possible application...

The control of metallic degradation using corrosion inhibitor formulations and anticorrosive coatings has drawn increasing attention in the academia and industries. The inhibition of metallic corrosion using organic compounds has been successfully reported. Nevertheless, there has been a recent upsurge in the application of functionalized carbon al...

The supercapacitive properties of synthesized nickel phthalocyanine multiwalled carbon nanotubes nanocomposite on a glassy carbon electrode (NiPcMWCNTs-GCE) in four different electrolytes were investigated. The successful synthesis of the NiPcMWCNTs nanocomposite was confirmed by UV/vis electrode spectroscopy, SEM, TEM, EDX, and XRD techniques. The...

A successful electrochemical study of copper oxide nanoparticles (CuO NPs), sulfonated poly (ether ether ketone) polymer (SPEEK), and sulfonated polyether ether ketone-copper oxide (SPEEK/CuO) nanocomposite on bare gold electrodes was conducted. The synthesized CuO NPs and SPEEK/CuO nanocomposite were characterized using X-ray diffraction (XRD), ul...

Self‐powered perovskite photodetectors (PDs) have attracted tremendous interest for their promising advantages such as fast response speed and high detectivity. However, they usually suffer from severe operating instability issues stemming from the poor film quality, impurity phase formation, and numerous surface defects. Herein, the high performan...

This study reports the electrochemical detection of ascorbic acid (AA) at screen printed carbon electrode (SPCE) modified with iron(III) oxide nanoparticle. Iron(III) nanoparticle was synthesized from Callistemon viminalis leaf extract (CV-Fe3O4NP). SPCE/CV-Fe3O4NP electrode showed faster electron transport in terms of the current response to AA ox...

Bovine mastitis (BM) is the traditional infectious condition in reared cattle which may result in serious repercussions ranging from animal welfare to economic issues. Owing to the high costs associated with preventative practices and therapeutic measures, lower milk output, and early culling, bovine mastitis is accountable for most of the financia...

This paper presented a facile fabrication of an electrochemical sensor from carbon quantum dots CQDs and copper oxide (CuO) nanocomposite for dopamine detection. Individual components of the sensor and the composite were characterized with UV-visible, FT-IR, EDS, XRD spectroscopy, and microscopic methods such as the SEM and TEM. The nanocomposite (...

The inhibition of mild steel deterioration via organic substances has become popular nowadays. Among the myriads of organic substances applied as potential inhibitors, quinoxalines stand out as toxic-free, cheap and effective compounds in different electrolytes. This report investigates the computational aspects of selected quinoxaline compounds te...

Nano-scale detection and characterization of neurotransmitters from real samples is a novel analytical technique with multiple applications in the field of nano-biotechnology. This in-situ electrochemical sensing tool has growing advantages of high reproducibility, rapid response, superior sensitivity, selectivity, accuracy, and miniaturization. A...

Ascorbic acid (AA) is an essential vitamin in the body, influencing collagen formation, as well as norepinephrine, folic acids, tryptophan, tyrosine, lysine, and neuronal hormone metabolism. This work reports on electrochemical detection of ascorbic acid (AA) in oranges using screen-print carbon electrodes (SPCEs) fabricated with multi-walled carbo...

Metal oxides NPs synthesized using orange peels extract (OE) and lemon peels extract (LE) and polyaniline (PANI) were used to modify the surface of screen printed carbon electrode (SPCE). The electrochemical responses of the various working electrode in potassium hexacyanoferrate (III) probe, and HCl electrolyte were evaluated using cyclic voltamme...

Twenty pyridazine derivatives with previously reported experimental data were utilized to develop predictive models for the anticorrosion abilities of pyridazine-based compounds. The models were developed by using quantitative structure-activity relationship (QSAR) as a tool to relate essential molecular descriptors of the pyridazines with their ex...

We live in a metal-based society where the use of metallic materials at all levels is common. These metallic materials (alloys and metals) are subject to an unavoidable but controllable phenomenon referred to as corrosion. When these materials corrode, they lose their physical and chemical properties, which poses great concern to individuals, indus...

The widespread deterioration of industrial metals is alarming and continues to demand the attention of experts in the academia and industry from both developed and developing countries. This undesirable phenomenon has a huge impact on the environment, safety, and economy of every nation of the world. Cases of environmental pollution due to release...

In this work, CuO nanoparticles (NPs) were prepared from the aqueous extracts of Solanum macrocarpon fruit by using the conventional heating (CuO(h) NPs) and microwave irradiation (CuO(m) NPs) methods. The synthesized nanoparticles were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffrac...

A positive attitude is a psychological concept describing a set of emotions, beliefs and behaviours of people towards a particular object, person or goal. As opposed to sikken attitude in an educational institution, a positive attitude encompasses a mental phenomenon by which educators and learners raise the bar of performance to a vantage point th...

The combat against metallic disintegration due to exposure to corrosive ions in the environment has prompted the adoption of different corrosion control methods. Several studies have established that corrosion inhibitor application and surface coatings are outstanding control protocols with excellent performance in reducing the rate of metallic cor...

The outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a public health emergency that turns the year 2020–2021 into annus horribilis for millions of people across international boundaries. The interspecies transmission of this zoonotic virus and mutated variants are aided by exposure dynamics of infected aerosols, fomites a...

This work reports on the successful synthesis of antimony oxide nanoparticles (AONPs) by hydrothermal method, acid treatment of multi-walled carbon nanotubes (f-MWCNTs), and fabrication of a MWCNT-AONP nanocomposite on screen-printed carbon electrodes (SPCE) to detect serotonin (5-HT) in tomatoes. The synthesized nanomaterials were all characterize...

Choline is an officially established essential nutrient and precursor of the neurotransmitter acetylcholine. It is employed as a cholinergic activity marker in the early diagnosis of brain disorders such as Alzheimer's and Parkinson's disease. Low levels of choline in diets and biological fluids, such as blood plasma, urine, cerebrospinal and amnio...

The investigation of organic compounds as potential inhibitors of metal corrosion using several experimental and/or computational techniques has been well established in literature. Recent advances in the development of corrosion inhibitors has led to the exploration of quantitative structure activity relationship (QSAR) as a worthy alternative to...

The degradation of surface water by anthropogenic activities is a global phenomenon. Surface water in the upper Crocodile River has been deteriorating over the past few decades by increased anthropogenic land use and land cover changes as areas of non-point sources of contamination. This study aimed to assess the spatial variation of physicochemica...

Reported here is the design of an electrochemical sensor for dopamine (DA) based on a screen print carbon electrode modified with a sulphonated polyether ether ketone-iron (III) oxide composite (SPCE-Fe3O4/SPEEK). L. serica leaf extract was used in the synthesis of iron (III) oxide nanoparticles (Fe3O4NPs). Successful synthesis of Fe3O4NP was confi...

Nanodiamond (ND) is a class of carbon nanomaterial with covalently connected sp³ carbon atoms in its core and an sp² carbon adorned surface via edge defects or doping. Endogenous chemicals that provoke physiological responses in the human system called neurotransmitters (NTs) have been detected with several sensors with carbon-based nanomaterials....

It has been well-established that organic corrosion inhibitors often form protective film through coordinate bonding with the metal. Different computational and experimental methods are used to describe the nature and effectiveness of such metal-inhibitor bonds. Quantitative structure activity relationship (QSAR) is one of the most recent and relia...

Iron (III) oxide nanoparticle (Fe 3 O 4 NP) was synthesized via green route using Callistemon viminalis leaf extract. A composite of Fe 3 O 4 NP with functionalized multi-walled carbon nanotube (f-MWCNT) was then applied as glassy carbon electrode modifier to develop a choline sensor. Electrocatalytic oxidation of choline on nanocomposite modified...

Africa as a developing continent is confronted with heavy metals pollution of their various water sources sequel to extending urbanization, growing industrialization and consequent rising anthropogenic activities accompanying development. With poor urban planning, indiscriminate slum settlement budding, unhealthy environmental sanitation, growing i...

The application of potassium bromate in the baking industry is used in most parts of the world to avert the human health compromise that characterizes bromates carcinogenic effect. Herein, various methods of its analysis, especially the electrochemical methods of bromate detection, were extensively discussed. Amperometry (AP), cyclic voltammetry (C...

The need for constant assessment of river water qualities for both aquatic and other biological survival has emerged a top priority, due to increasing exposure to industrial pollutants. A disposable screen print carbon electrode was modified with a conductive polymer (PANI) and Zn and/or Cu oxides NPs, obtained through bioreduction in citrus peel e...

Choline is employed as cholinergic activity marker in brain tissue in the field of clinical detection of diseases. Although, chromatographic methods and biosensors are the most commonly used techniques for choline detection, there is also an interest in exploring the efficacy of a cost effective non-enzyme based sensor for choline detection. Here,...

The paper provides insights on the less costly and eco-friendly green technique used for the synthesis of gold metal nanoparticle from banana (Musa paradisiaca) peel extracts. Electrospinning method was used to fabricate a stabilized nanocomposite polyacrylonitrile functionalized with green synthesized gold (PAN/Au) into nanofibers. The nanoparticl...

Choline is employed as cholinergic activity marker in brain tissue in the field of clinical detection of diseases. Although, chromatographic methods and biosensors are the most commonly used techniques for choline detection, there is also an interest in exploring the efficacy of a cost effective non-enzyme based sensor for choline detection. Here,...

This report narrates the successful application of a fabricated novel sensor for the trace detection of endosulfan (EDS). The sensor was made by modifying a glassy-carbon electrode (GCE) with polyaniline (PANI), chemically synthesized antimony oxide nanoparticles (AONPs), acid-functionalized, single-walled carbon nanotubes (fSWCNTs), and finally, t...

Green synthesis of nanoparticles using citrus peel extracts is known to be environmentally friendly and non-toxic when compared to chemical methods. In this study, different citrus peel extracts obtained with the solvents acetone and distilled water were used to synthesize copper oxide nanoparticles (CuONPs). The nanoparticles were characterized us...

DYSTOCIA cases were observed in 8 Ndama cows bred by a particular German Brown bull at the University of Ibadan farm. The cases were caused by malpresentation and relative oversize of the foetuses. No dystocia was observed in the herd after this particular bull was culled. The sequelae of dystocia observed are discussed.

Nickel sulphides and nickel oxides nanoparticles have been synthesized from Ni(II) bis (N-alkyl-N-ethanoldithiocarbamate), represented as NiL¹2 (L¹, with methyl group) and NiL²2 (L², with ethyl group). Both complexes were characterized using Fourier transform infra-red (FTIR), nuclear magnetic resonance spectroscopy and elemental analysis. The sulp...

The current study compared the synthesis, characterization and properties of copper oxide nanoparticles (CuO) based on green and traditional chemical methods. The synthesized CuO were confirmed by spectroscopic and morphological characterization such as ultraviolet-visible (UV-vis) spectroscopy, fourier transform infrared (FTIR) spectroscopy, zeta...

This study assessed the antimicrobial efficacy of synthesized zinc oxide nanoparticles produced using aqueous extracts of pomegranate leaves and flowers designated ZnO-NPs-PL, ZnO-NPs-PF. In the study, oxides of zinc were successfully employed to fabricate nanoparticles using extracts from leaves and flowers of pomegranate (Punica granatum). The na...

Less toxic, environmentally safe green-mediated iron (III) oxide nanoparticles (Fe 3 O 4-NP) synthesized using Callistemon viminalis (C. viminalis) leaf (Fe 3 O 4-NPL) and flower (Fe 3 O 4-NPF) extracts is reported in this work for the first time. Total flavonoids and phenols present in the plant extracts were determined. Characterization of the na...

Imbalance in the levels of monoamine neurotransmitters have manifested in severe health issues. Electrochemical sensors have been designed for their determination, with good sensitivity recorded. Carbon-based quantum dots have proven to be an important component of electrochemical sensors due to their high conductivity, low cytotoxicity and opto-el...

Molecularly imprinted polymers (MIPs) have been widely used for the modification of electrodes because of their native specificity for the intrinsic template molecules. The importance of catecholamines in the neurological and general well‐being of every individual cannot be overemphasized. Disorders associated with the imbalance in catecholamine le...

Neurotransmitters (NTs) are chemical compounds that play an important physiological role in the functioning of central nervous, renal, hormonal, and cardiovascular systems. Their function is to regulate neural interactions by reducing the permeability of gap junctions between adjacent neurons of the same type. The abnormal level may lead to disease...

Zinc Oxide (ZnO) nanoparticles were prepared using a simple green synthesis approach in an alkaline medium, from three different extracts of citrus peels waste. The synthesized nano-crystalline materials were characterized by using ultraviolet-visible spectroscopy (UV-vis), x-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT...

A novel caffeine sensor was constructed based on a platinum electrode (PtE) modified with polypyrrole (PPY) and green synthesized Ag‐Au bimetallic nanoparticles. Furthermore describes the synthesis of silver nanoparticles (AgNPs), gold nanoparticles (AuNPs), as well as Ag‐Au bimetallic nanoparticles (BMNPs) using the extract of citrus sinensis (swe...

Drop casting method was used for the fabrication of modified electrode of sulphonated polyether ether ketone/zinc oxide (SPEEK/ZnO) nanocomposite on gold electrode for electrochemical oxidation of dopamine and were were characterized by using FT‐IR, Uv‐vis, SEM and EDS. The result obtained at Au/SPEEK/ZnO modified electrode was compared with those...

This study reports the properties of green mediated synthesized iron oxides nanoparticles (Fe 3 O 4 NPs) from peel extracts of pomegranate plant and its polyacrylonitrile/iron oxide composite nanofibers (Fe 3 O 4 /PAN). The following were used to characterize the synthesized nanoparticles and its polymer nanofibers; FT-IR, UV-Visible spectroscopy,...

This study reports electrochemical detection of serotonin at a screen-printed carbon electrode (SPCE) modified with polypyrrole (PPy), doped with green iron (III) oxide nanoparticles. The synthesized of the iron (III) oxide nanoparticles is from Callistemon viminalis leaves (Fe3O4NPsL) and flowers (Fe3O4NPsF) extract. Modified SPCE-PPy-Fe3O4NPsL an...

his paper reports a cost effective and eco-friendly green technique used for the synthesis of silver metal nanoparticle from orange peel extracts. The synthesized nanoparticle was functionalized with polyacrylonitrile to form PAN/Ag nanofibers by electrospinning. The synthesized nanoparticle and its nanofibers were characterized by using spectrosco...

This study investigates in-vitro activities of phytochemicals in Callistemon citrinus against multi-resistant foodborne pathogens, alpha-glucosidase enzyme and MCF-7 cancer cell line. Assays were prepared with lyophilized extracts to determine antioxidant capacity, inhibition of α-glucosidase enzyme and growth of foodborne bacteria. Annexin-V detec...

Silver (Ag) nanoparticles (NPs), gold (Au) NPs, and silver–gold (Ag–Au) bimetallic nanoparticles (BNPs) were synthesized by use of golden rod leaf extracts. Aqueous solutions of the precursor compounds HAuCl4·xH2O and AgNO3 were mixed individually and jointly with aqueous extract of golden rod leaf and heated with stirring at 80 °C for 1 h. There w...

This work describes the chemical synthesis of antimony oxide nanoparticles (AONPs), polyaniline (PANI), acid functionalized single-walled carbon nanotubes (fSWCNTs), and the nanocomposite (AONP-PANI-SWCNT) as catalyst for the trace detection of lindane. Successful synthesis of the nanomaterials was confirmed by Fourier transform infrared (FT-IR) sp...