Murraya koenigii mediated synthesis of cobalt doped NiO nanoparticles: Evaluation of structural, optical properties and anti-bacterial activity

Abstract

Recently, the synthesis of nanoparticles using phytoextracts has been focused worldwide due to their reduced chemical toxicity. We prepared NiO and Co-doped NiO nanoparticles using Murraya Koenigii leaf extracts to replace synthetic bactericides. The prepared samples were characterized by XRD, UV–Vis, FTIR, SEM, and EDAX analytical techniques. According to XRD analysis, the green synthesised NiO and Co-doped NiO nanoparticles have a crystalline cubic structure. NiO and Co-doped NiO nanoparticles showed a characteristic absorption peak at 348 nm. FTIR spectroscopy confirmed the functional groups of biomolecules present in the synthesised materials. The size of the prepared nanoparticles was found to be 80–250 nm as observed through SEM analysis. Enhanced antibacterial activity was observed for Co doped NiO against gram negative (Klebsiella pneumonia, Shigella dysenteriae ), gram positive ( Staphylococcus aureus , and Bacillus) bacterial strains. • Murraya Koenigii leaf extracts assisted green synthesis was adopted to prepare NiO and Co doped NiO nanoparticles. • The effect of Co doping on structural, optical and morphological properties of NiO nanoparticles were analysed. • The excellent antimicrobial activity of pure and doped NiO nanoparticles were reported.