ELIAS ELEMIKE | Federal University Lafia. Nasarawa State. Nigeria (original) (raw)

Papers by ELIAS ELEMIKE

Journal Of Chemical Society Of Nigeria, 2015

Materials Science and Engineering: B, 2021

Abstract In this review, synthesis, properties and applications of semiconductors nanomaterials w... more Abstract In this review, synthesis, properties and applications of semiconductors nanomaterials was discussed. Semiconductors have become an all-important inorganic materials and their processing into nanoparticles or quantum dots has shown advanced and novel ways of applications. Different categories of binary, ternary and multinary semiconductors were highlighted. Semiconductor nanocomposites, on the other hand, have emerged from the combination of semiconductor nanoparticles with other materials such as metals, polymers, cellulose using different synthetic methods. Among all the methods, green techniques seem to be the interesting protocols for nanoparticles to be applied in biomedical fields since they involve non-toxic substrates and reaction media. Sonochemical method, solvothermal approach and microwave synthesis are among the facile methods which are being exploited and holds great future for large scale nanomaterials. The nanomaterials however are widely applied in photocatalysis, energy, sensing, water purification, biomedicine, electronics with further material engineering for other future applications.

International Journal of Biological Macromolecules, 2020

Advanced Materials Letters, 2019

Journal of Energy Storage, 2021

Abstract Energy storage materials are researchers’ interest in recent times due to latest innovat... more Abstract Energy storage materials are researchers’ interest in recent times due to latest innovations in transportation, communication and electronics. Li-ion batteries, supercapacitors and hydrogen storage systems are the three primary energy storage systems which require active materials with high mechanical strength, porosity, high electrical and thermal conductivity and cyclability. 2D materials such as Graphene and MXenes are extensively gaining interest as electrode materials for energy storage and conversions, compositional materials, electromagnetic interference shielding amongst others. However, there is need to enhance on the pristine 2D materials for better efficiency. The construction of 2D to 3D nanoarchitectures can improve porosity, specific surface area, reduce stacking and ion and mass transport distance. The formation of nanocomposites or heterostructures with the 2D materials is also another interesting technology to improve on their properties and applications. In this review, we examined the synthesis route, the select properties and applications of 2D graphene and MXenes materials, however, the trend towards composite materials and 3D nanoarchitectures are more promising.

Frontiers in Materials, 2021

Recent years, organic-inorganic hybrid perovskites (OIHPs) have been widely used in applications,... more Recent years, organic-inorganic hybrid perovskites (OIHPs) have been widely used in applications, such as solar cells, lasers, light-emission diodes, and photodetectors due to their outstanding optoelectronic properties. Nowadays photodetectors based on perovskite films (PFs) suffer from surface and interface traps, which result from low crystalline quality of perovskite films and lattice mismatch between perovskite films and substrates. Herein, we fabricate MAPbI3 -(MA = CH3NH3) single-crystal films (SCFs) on MAPbBr3 single crystal substrates in MAPbI3 precursor solution during crystallization process via solution-processed epitaxy. Benefit from the good lattice matching, epitaxial MAPbI3 SCFs with high crystallinity and smooth morphology are of comparable quality to MAPbI3 PSCs and are of better quality than MAPbI3 polycrystalline films. Here we report that epitaxial MAPbI3 SCFs have a low trap density of 5.64×1011 cm–3 and a long carrier lifetime of 11.86 μs. In this work, photod...

A Schiff base ligand, 4-benzylimino-2-3-dimethyl-l-phenylpyrazal-5-one have been synthesized by t... more A Schiff base ligand, 4-benzylimino-2-3-dimethyl-l-phenylpyrazal-5-one have been synthesized by the condensation of Benzaldehyde and 4-aminoantipyrine. Its divalent metal complexes of Fe, Co, Ni, Cu and Zn were also synthesized. The ligand and the complexes were characterized by FTIR, UV/visible, 1 H-NMR, 13 C-NMR, and GCMS. The ligand behaved as a bidentate donor by using its carbonyl and azomethine N as binding sites for the metals. Tetrahedral structures were proposed for the all complexes excepting the Cu(II) complex. The ligand showed low activity against some microbes but the complexes were remarkably active against the bacteria and fungi species.

Chinese Optics Letters, 2021

Optoelectronic applications based on the perovskites always face challenges due to the inherent c... more Optoelectronic applications based on the perovskites always face challenges due to the inherent chemical composition volatility of perovskite precursors. The efficiency of perovskite-based light-emitting diodes (Pe-LEDs) can be enhanced by improving the perovskite film via solvent engineering. A dual solvent post-treatment strategy was applied to the perovskite film, which provides a synchronous effect of passivating surface imperfections and reduces exciton quenching, as evidenced by improved surface morphology and photoluminance. Thus, the optimized Pe-LEDs reach 17,866 cd·m−2 maximum brightness, 45.8 cd·A−1 current efficiency, 8.3% external quantum efficiency, and relatively low turn-on voltage of 2.0 V. Herein, we present a simple technique for the fabrication of stable and efficient Pe-LEDs.

Nano-Structures & Nano-Objects, 2020

Abstract Cobalt hydroxide and cobalt oxide nanoparticles (NPs) were prepared using extract of Lit... more Abstract Cobalt hydroxide and cobalt oxide nanoparticles (NPs) were prepared using extract of Litchi cinensis via a simple boiling of a solution of the extract and cobalt acetate tetrahydrate; and also by a rapid microwave-assisted method. Structural and morphological characterization of the synthesized NPs were carried out using X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fourier transform infrared spectroscopy (FTIR). The XRD patterns revealed that the cobalt hydroxide obtained via the two approaches were the β form, with space group of P-3ml, and the product from the microwave route yielded particles with higher crystallinity. TEM analysis showed that the Co(OH)2 nanoparticles have similar spherical morphologies and monodispersity. Cobalt oxide (Co3O4) nanoparticles, were obtained by the calcination of the hydroxide species and resultant loss of both the water molecule and the phytochemical component of the particles, and showed elongated rod like morphology. The diffraction peaks of the Co3O4 nanoparticles were indexed as Face-centered cubic phase with a space group of Fd-3m. This green approach, without the use of any chemical reagent, proves to be an efficient, simple, fast and cost effective route for the synthesis of Co(OH)2 and Co3O 4 NPs which may be used in various applications.

Inorganic and Nano-Metal Chemistry, 2020

Abstract The use of plants in nanosynthesis has potentiated the application of most greeneries in... more Abstract The use of plants in nanosynthesis has potentiated the application of most greeneries in this field of study. The aqueous extract of Umbrella plant and different concentrations (1 mM, 2 mM and 5 mM) of AgNO3 were utilized in the preparation of silver nanoparticles (AgNPs). Two volume ratios, 1:5 and 1:10, of the substrate to the precursor were used, and the rate of formation of the AgNPs was monitored using UV-vis spectroscopy. The nanoparticles were characterized using infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), and powder X-ray diffraction (pXRD) techniques. The particle sizes of the nanoparticles were below 20 nm, with the 1:10 ratio of all the concentrations giving the lowest size. The photocatalytic abilities of the AgNPs in the degradation of methyl red were studied. The antimicrobial properties of the nanoparticles against common microbes such as Staphylococcus auerus, Bacillus cereus, Klebsiella pneumoniae and Escherichia coli showed interesting results.

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IET nanobiotechnology, 2018

In this study, the conversion of silver ions into ∼30.74 nm sized silver nanoparticles (AgNPs) wa... more In this study, the conversion of silver ions into ∼30.74 nm sized silver nanoparticles (AgNPs) was achieved in 30 min at a reaction temperature of 80-90°C in aqueous leaf extract of . The synthesised AgNPs showed surface plasmon resonance in the range of 423-438 nm. Spherical and face-centred cubic nanoparticles were confirmed by transmission electron microscope (TEM) and X-ray diffraction (XRD) analysis, respectively. Fourier transform infra-red (FTIR) results indicated that the obtained nanoparticles were stabilised and capped through the carbonyl and carboxylate ion groups possibly from flavonoids, terpenoids, phenolics and esters content of the extracts. In addition, the AgNPs were assessed for their biological potentials against some microbes and, also, their free radical scavenging ability was established. The AgNPs exhibited interesting antimicrobial and antioxidant properties better than the aqueous extract of

Journal of Cluster Science, 2016

Silver nanoparticles (AgNPs) were synthesized using leaf extract of Talinum triangulare (TT). The... more Silver nanoparticles (AgNPs) were synthesized using leaf extract of Talinum triangulare (TT). The nanoparticles were characterised using Infra-red spectroscopy, UV–vis spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The UV–vis spectrum showed the formation of surface plasmon bands (SPBs) between 417 and 430 nm. The X-ray diffraction (XRD) and transmission electron microscopy analysis showed spherically shaped nanoparticles with average size of 13.86 nm. Antimicrobial potentials of the silver nanoparticles, the leaf extract and AgNO3 were evaluated against Gram negative (Escherichia coli, Salmonella typhi), Gram positive (Bacillus subtilis and Staphylococcus aureus) bacteria strains and fungi organism, Candida albicans. The silver nanoparticles displayed better antimicrobial activities compared to the other samples. The antioxidant properties of the nanoparticles and crude leaf extract were investigated using DPPH radical scavenging assay. The AgNPs exhibited better DPPH radical scavenging activities compared to the leaf extract. Moreover, the antioxidant activity of the AgNPs compared favourably with that of ascorbic acid at the same concentrations. Furthermore, electrochemical studies involving TT-AgNPs/MWCNT (multiwalled carbon nanotubes) modified electrode and comparative cyclic voltammetry experiments with other modified electrodes (bare GCE, GCE/MWCNT and GCE/TT-Ag) showed that GCE/TT-AgNPs/MWCNT exhibited good conducting platform for electrocatalysis and a lower charge transfer resistance (Rct).

Journal of Applied Research and Technology, 2016

CrystEngComm, 2021

The epitaxially fabricated MAPbBr3/Bi3+-doped MAPbCl3 PSCs pN heterojunction shows advanced X-ray... more The epitaxially fabricated MAPbBr3/Bi3+-doped MAPbCl3 PSCs pN heterojunction shows advanced X-ray detection performance with decreased dark current density and faster response time under relatively high external reverse voltage.

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Journal of Inorganic and Organometallic Polymers and Materials, 2021

Chitosan was isolated from chitin, a direct derivative of snail shell, and further used to form a... more Chitosan was isolated from chitin, a direct derivative of snail shell, and further used to form a heterostructure with ZnO nanoparticles (ZnO NPs). This study was carried out to utilize green nanochemistry in the purification of waste water. The obtained ZnO-chitosan nanocomposite was made by precipitation method and characterized by Fourier Transform Infrared (FTIR), powder X-ray diffraction (pXRD), Energy dispersive X-ray (EDX), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analyses. The FTIR spectra among other peaks revealed bands around 1735–1740 cm−1 in all the spectra due to C=O stretching band. The XRD patterns showed the crystalline nature of ZnO and the ZnO-chitosan nanocomposites with low intensities in the peaks of the nanocomposites, an indication of reduced crystallinity. The SEM micrographs showed thin strands of the chitin and chitosan whereas the ZnO NPs appeared as clustered spheroids with the ZnO-chitosan nanocomposites revealing the anchoring of the ZnO spheroids on the smooth strands of the chitosan. The EDX spectra showed various elemental compositions with 54.82% Zn in the ZnO NPs and 17.27% Zn in the ZnO-chitosan nanocomposites. TEM studies showed spherical images of the ZnO NPs (3.69 nm) and the quasi-spherical nature of the ZnO-chitosan nanocomposites (8.91 nm). The photodegradation of methylene blue dye by ZnONPs recorded gradual decomposition of the dye while in the composite, a tremendous change was observed within the first 15 min of the reaction.

Results in Materials, 2021

2019 3rd International Conference on Circuits, System and Simulation (ICCSS), 2019

A packaging method to improve the conversion efficiency of monocrystalline silicon solar cells is... more A packaging method to improve the conversion efficiency of monocrystalline silicon solar cells is presented. In this method, Ce-doped yttrium aluminum garnet (YAG:Ce) phosphor particles as luminescence down-shifting materials are coated on the surface of the solar cells which are then packaged with ethylene vinyl acetate (EVA) and glass. The experimental results show that, after being packaged, the increase in the conversion efficiency is from 17.24% to 18.13%. The enhancement can be attributed to the luminescence down-shifting effect of YAG:Ce phosphors which convert ultraviolet/blue light into yellow light, the reduced reflection in the wavelength range below 480nm and the absorption of the light which is emitted from the phosphor particles and reflected back at air/glass interface. This method provides a potential way to improve the solar cells through the packaging processes, which is appliable for industries.