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首页> 外文期刊>Journal of materials science >Green synthesis of ZnO and ZnO/CuO nanocomposites in Mentha longifolia leaf extract: characterization and their application as anti-bacterial agents
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Green synthesis of ZnO and ZnO/CuO nanocomposites in Mentha longifolia leaf extract: characterization and their application as anti-bacterial agents

机译：薄荷叶提取物中的绿色合成ZnO和ZnO / CuO纳米复合材料：表征及其作为抗菌剂的应用

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In this work, we fabricated ZnO and ZnO/CuO nanocomposites using Mentha longifolia leaf extract as a natural, non-toxic, and efficient stabilizer. Anti-bacterial activities of the prepared samples against two pathogenic bacteria, Escherichia coli (Gram-negative), and Staphylococcus aureus (Gram-positive) were investigated. The properties of the as-prepared samples were characterized by XRD, EDX, SEM, TEM, TGA, FT-IR, UV-Vis DRS, and BET instruments. The XRD analysis indicated that the size of crystallites was decreased for the ZnO powder prepared in the presence of the leaf extract. The SEM images showed that the samples consist of spherical shaped well-distributed particles. In addition, the presence of biomolecules from the leaf extract was revealed by EDX, TGA, FT-IR, and UV-Vis DRS analyses, which are important in biosynthesis process. The highest anti-bacterial activity belonged to the ZnO/CuO (10%) nanocomposite and the other compounds, including ZnO/CuO (5%), ZnO (ext), and ZnO (W) were in the next ranks, respectively. It was observed that the viability percentages against E. coli (10.16 +/- 2.2) is higher than that of S. aureus (17.1 +/- 0.87) in the presence of the ZnO/CuO (10%) nanocomposite. Ultimately, the mechanism for the action of the ZnO/CuO (10%) nanocomposite was explored through the SEM images, which involved the disruption of the bacterial membranes.
机译：在这项工作中，我们使用薄荷叶提取物作为天然，无毒和有效的稳定剂，制备了ZnO和ZnO / CuO纳米复合材料。研究了制备的样品对两种病原菌，大肠杆菌（革兰氏阴性）和金黄色葡萄球菌（革兰氏阳性）的抗菌活性。通过XRD，EDX，SEM，TEM，TGA，FT-IR，UV-Vis DRS和BET仪器对所制备样品的性质进行表征。 XRD分析表明，在存在叶提取物的情况下制备的ZnO粉末的微晶尺寸减小。 SEM图像显示样品由球形的均匀分布的颗粒组成。此外，通过EDX，TGA，FT-IR和UV-Vis DRS分析揭示了叶提取物中生物分子的存在，这在生物合成过程中很重要。最高的抗菌活性属于ZnO / CuO（10％）纳米复合材料，其他化合物分别为ZnO / CuO（5％），ZnO（ext）和ZnO（W）。观察到，在存在ZnO / CuO（10％）纳米复合材料的情况下，对大肠杆菌的生存力百分比（10.16 +/- 2.2）高于金黄色葡萄球菌的生存力百分比（17.1 +/- 0.87）。最终，通过SEM图像探索了ZnO / CuO（10％）纳米复合材料的作用机理，该机理涉及细菌膜的破坏。

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