Biosynthèse et caractérisation de nanoparticules d'oxyde de nickel à partir de différents extraits de plantes et étude de leurs activités biologiques

In recent years, nanoparticles synthesized by the green method have attracted the attention of many researchers due to their improved properties that are desirable in many fields. This study aims to biosynthesize nickel oxide nanoparticles and evaluate their antioxidant activities. Two plant extracts (Artemisia herba alba leaves and Punica granatum L peel) were utilized as reducing and stabilizing-agents for the green synthesis process. To control and improve the crystal size and antioxidant activity of NONPs, we focused on studying two parameters: plant extract and nickel nitrate concentration. Several characterization techniques such as UV/Vis, X-ray diffraction, FT-IR, SEM, and EDX were used to validate the formation of NONPs and study their structural and morphological properties.
Results verified the successful biosynthesis of nickel oxide nanoparticles. UV/Vis absorption spectrum showed a maximal absorption at 300 nm which is related to NiO. The FTIR spectrum exhibited common peaks between 400 and 1000 cm-1, which corresponds to the Ni-O stretching vibration mode. In addition, the XRD patterns confirmed that NONPs are of high purity and crystallinity, with a nanoscale-size ranging from 7.49 to 14.51 nm. The images obtained by a scanning electron microscope (SEM) indicated that some of the obtained nanoparticles have a spherical shape, while others have an irregular shape. Additionally, the antioxidant activity of NONPs samples was evaluated using three different techniques, which showed significant antioxidant activity in all the performed tests.