Green Synthesis of cupric Oxide nanoparticles (CuONPs) using the plant extract is an emerging field of extensive applications. In the present study, the CuONPs were carried out by reducing copper sulfate solution by the aqueous Malva parviflora leaves extract, where this plant is used as a reducing and capping agent. The precursor salt solution and reducing agent were mixed in a 1:4 volume ratio at 50 oC and pH=9. According to the UV-VIS spectrum, the surface plasmon resonance (SPR) absorption band was observed at 262 nm. UV-VIS spectroscopy also was employed to estimate the band gap energy of CuO nanoparticles, in which the optical band gap was varied depending upon the particle size and copper sulfate concentration. The XRD was found that synthesized CuONPs were Amorphous structure. FT-IR spectrum revealed that the presence of flavonoid may be the significant cause of reducing and capping of CuONPs. Furthermore, the mechanism of CuO nanoparticle formation has also been discussed.
Copper oxide nanoparticles are essential technology materials that are utilized as catalysts in the chemical industry, as well as in photonic and electronic devices and medical applications. Due to their applications in advanced technologies, we have concentrated on the production of CuO nanoparticles using enhanced, cost-effective, and environmentally friendly synthetic techniques. In this paper, we have presented a green synthesis technique to successfully synthesis copper oxide nanoparticles (CuO NPs) utilizing copper (II) sulfate pentahydrate (CuSO4.5H2O) as precursor salt and Mentha Piperita leaf extract as a reducing and stabilizing agent during the synthesis process. The precursor salt solution and reducing agent were mixed in a 1:1 volume ratio at 50 °C. The CuO NPs synthesized were confirmed by the characteristics Surface Plasmon Resonance (SPR) peak in the UV-visible region. Also, the optical direct band gap energy of the CuO NPs determined from the Tauc plot was 3.26 eV. The FTIR spectrum analysis confirmed existence of functional groups of polyphenols from Mentha piperita L. leaf extract, which are responsible for the reduction of Cu2+ ions and effective stabilization of CuO NPs. All the peaks observed in the XRD pattern revealed the production of CuO NPs having monoclinic structure with an average crystallite size of 42.51 nm. The surface morphology of the CuO nanoparticles was detected using SEM analysis. Further, the synthesis mechanism of CuO NPs has also been investigated.
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