Green synthesis and characterization of zinc oxide nanoparticles using Eucalyptus globulus Labill. Leaf extract and zinc nitrate hexahydrate salt

摘要

This study consists of a reliable process for synthesizing ZnO NPs by green method. Here, Eucalyptus globulus Labill. leafextract is utilized as an efficient chelating and capping agent for synthesizing ZnO NPs from zinc nitrate hexahydratesalt. The plant ingredients, structure, morphology, thermal behavior, chemical composition and optical properties ofZnO nanoparticles were investigated using several characterization techniques, namely XRD, FE-SEM, EDX, BET, Zetapotential, DLS, differential scanning calorimetry (DSC) analysis, FT-IR analysis and UV–Vis spectroscopy. The UV–Vis andFTIR analysis of Eucalyptus globulus leaf extract verified that this extract is a promising candidate for biosynthesizing ZnONPs. The XRD spectrum, DLS and the SEM images confirmed the crystallinity and the spherical-shape of the ZnO NPs withan average size between 27 and 35 nm. The band-gap of the ZnO were measured to be around 2.67 eV. Zeta potentialand BET analysis showed that, the biosynthesized ZnO NPs possess good stability and the their specific surface area is23.481 m~2/g. DSC analysis exhibits two endothermic peaks related to the water evaporation absorbed by the NPs andmodification of zinc complex to zinc hydroxide, with a single exothermic peak related to the crystallization of ZnO NPsand degradation of organic materials.