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Green synthesis of cobalt oxide nanoparticles and the effect of annealing temperature on their physiochemical and biological properties

Sirajul HaqDepartment of Chemistry, University of Azad Jammu and Kashmir Muzffarabad, 13100 PakistanFarwah AbbasiDepartment of Chemistry, University of Azad Jammu and Kashmir Muzffarabad, 13100 PakistanManel Ben AliDepartment of Biology, College of Sciences, Taif University, PO Box 11099, Taif 21944, Saudi ArabiaAmor HedfiDepartment of Biology, College of Sciences, Taif University, PO Box 11099, Taif 21944, Saudi ArabiaAmine MezniDepartment of Chemistry, College of Science, Taif University, PO Box 11099, Taif 21944, Saudi ArabiaWajid RehmanDepartment of Chemistry, Hazara University Mansehra, 21300, PakistanMuhammad WaseemDepartment of Chemistry, COMSATS University Islamabad (CUI), Islamabad, PakistanAbdul Rehman KhanDepartment of Chemistry, University of Azad Jammu and Kashmir Muzffarabad, 13100 PakistanHamayun ShaheenDepartment of Botany, University of Azad Jammu & Kashmir, Muzaffarabad, 13100, Pakistan

2021en

ABI

Annotatsiya

Abstract The cobalt oxide nanoparticles (Co 3 O 4 NPs) were synthesized via the green method using Piper nigrum ( P. nigrum ) leaves extract and were calcined at different temperatures. The crystalline nature was studied through x-ray diffractometer (XRD). With increasing calcination, the amorphous phase transitioned to the crystalline phase. Diffuse reflectance spectroscopy (DRS) was used to observe UV-Visible light absorbance phenomenon, and Tauc’s plot was used to calculate the band gap energy, which was found to decrease with calcination. Scanning electron microscopy (SEM) was used to analyze the surface morphology, and Fourier transform infrared (FTIR) spectroscopy was used to classify the surface functional groups. The antibacterial efficacy of the Co 3 O 4 NPs was examined against Gram-positive bacteria (GPB) and Gram-negative bacteria (GNB), whereas its antioxidant potential was explored against ABTS free radicals. Antibacterial and antioxidant potentials of Co 3 O 4 NPs were found to decrease with increasing calcination.

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DOI: 10.1088/2053-1591/ac1187

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