In the present work, zinc oxide (ZnO) and silver (Ag) doped ZnO nanostructures are synthesized using a hydrothermal method. Structural quality of the products is attested using X-ray diffraction, which confirms the hexagonal wurtzite structure of pure ZnO and Ag-doped ZnO nanostructures. XRD further confirms the crystallite orientation along the c-axis, (101) plane. The field emission scanning electron microscope study reveals the change in shape of the synthesized ZnO particles from hexagonal nanoparticles to needle-shaped nanostructures for 3 wt% Ag-doped ZnO. The optical band gaps and lattice strain of nanostructures is increased significantly with the increase of doping concentration of Ag in ZnO nanostructure. The antimicrobial activity of synthesized nanostructures has been evaluated against the gram-positive human pathogenic bacteria, Staphylococcus aureus via an agarose gel diffusion test. The maximum value of zone of inhibition (22 mm) is achieved for 3 wt% Ag-doped ZnO nanostructure and it clearly demonstrates the remarkable antibacterial activity.

中文翻译：

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纯和掺杂 Ag 的 ZnO 纳米结构的结构、光学和抗菌性能

在目前的工作中，使用水热法合成了氧化锌 (ZnO) 和银 (Ag) 掺杂的 ZnO 纳米结构。使用 X 射线衍射证明产品的结构质量，这证实了纯 ZnO 和掺杂 Ag 的 ZnO 纳米结构的六方纤锌矿结构。XRD 进一步证实了沿C-轴，（101）平面。场发射扫描电子显微镜研究表明，对于 3 wt% Ag 掺杂的 ZnO，合成的 ZnO 颗粒的形状从六角形纳米颗粒变为针状纳米结构。随着ZnO纳米结构中Ag掺杂浓度的增加，纳米结构的光学带隙和晶格应变显着增加。合成纳米结构的抗菌活性已针对革兰氏阳性人类致病菌进行了评估，金黄色葡萄球菌通过琼脂糖凝胶扩散试验。3 wt% Ag 掺杂的 ZnO 纳米结构实现了抑制区的最大值 (22 mm)，它清楚地证明了显着的抗菌活性。