Kumar, P.Ramesh, M.R.Doddamani, M.Suresh, J.Lingaraj, R.2026-02-042024Materials Letters, 2024, 359, , pp. -0167577Xhttps://doi.org/10.1016/j.matlet.2024.135918https://idr.nitk.ac.in/handle/123456789/21231In recent years, environmentally friendly methods have garnered significant attention in developing novel nanoparticles (NPs). This study focuses on the green synthesis and characterisation of CuO/MgO/ZnO NPs using Costus pictus D. Don Plant extract as a green reducing and capping agent. X-ray diffraction (XRD) analysis was employed to assess the purity of NPs, whereas Fourier-transform infrared (FTIR) and UV–Vis spectroscopy were employed to study the chemical composition and absorption peaks of the synthesised NPs. The Field-emission scanning electron microscopy (FE-SEM) images revealed a distinctive flower-like morphology of NPs, and their stability and dispersion were supported by a negative zeta potential of −14.8 mV. The significant surface area (87.742 m2/g) of CuO/MgO/ZnO NPs was obtained from Brunauer-Emmett-Teller (BET) analysis. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) analysis confirmed that the particle size of NPs is nearly 50 nm and is poly-crystalline. Finally, the synthesised NPs were tested against the bacteria using the agar-well diffusion method. Notably, CuO/MgO/ZnO NPs exhibited better antibacterial activity against Pseudomonas aeruginosa, yielding a substantial inhibition zone of 23.33 ± 2.08 mm. © 2024 Elsevier B.V.BacteriaElectron diffractionEnamelsField emission microscopesFourier transform infrared spectroscopyHigh resolution transmission electron microscopyII-VI semiconductorsMagnesiaMorphologyNanoparticlesParticle sizeParticle size analysisPlant extractsScanning electron microscopySynthesis (chemical)X ray diffraction analysisZinc oxideAnti-bacterial activityAntibacterialsCapping agentFourier transform infraredGreen synthesisLeaf extractsSynthesis and characterizationsSynthesisedUV/ Vis spectroscopyZnO nanoparticlesCopper oxides