article · Materials International
Nickel oxide nanoparticles have been successfully synthesised using an extract from Vernonia amygdalina leaves, which served as a chelating agent alongside a nickel chloride precursor. The resulting material was a grey-black powder that underwent thermal annealing at 500 degrees Celsius for two hours to yield nickel oxide nanoparticles. Structural and morphological evaluations were carried out using powder X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. The analysis confirmed the formation of nickel oxide nanoparticles with an average crystallite size of 17.86 nanometres. Furthermore, microscopic imaging showed that the nanoparticles possessed an octahedral structure, whilst spectroscopic measurements verified the characteristic nickel-oxygen bond vibration at 1094.8 reciprocal centimetres.
Producing nanomaterials using plant extracts provides an alternative route to conventional chemical synthesis methods. By using Vernonia amygdalina leaves as a natural chelating agent, this work establishes a specific laboratory protocol for obtaining nanoscale nickel oxide with defined crystallite sizes and octahedral shapes.
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The present study reports the successful synthesis of nickel oxide nanoparticles using Vernonia amygdalina plant leaf extracts as a chelating agent and nickel (II) chloride hexahydrate (NiCl2•6H2O) as precursor. The synthesized powder was gray black in color and annealed at 500 °C for 2 hours to obtain nickel oxide nanoparticles. Characterization techniques such as powder X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy were used to study the structure and morphology of the nanoparticles. Powder X-ray diffraction patterns revealed that nickel oxide nanoparticles with an average crystallite size of 17.86nm were synthesized. Scanning electron microscope images show that the nanoparticles have octahedral structure. Fourier transform infrared spectrophotometer analysis revealed that the strongest bond at 1094.8cm-1 corresponds to stretching vibration mode of Ni-O nanoparticles.
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DOI: 10.33263/materials22.205209
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