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Effect of fuel content on luminescence and antibacterial properties of zinc oxide nanocrystalline powders synthesized by the combustion method

机译：燃烧法合成氧化锌纳米晶体粉末发光与抗菌性能的影响

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Nanoscale ZnO powders were synthesized via the combustion method using zinc nitrate hexahydrate as the source (oxidant) material and urea, and glycine or citric acid monohydrate as fuels. The effect of the relative fuel to oxidant ratio on the characteristics of ZnO particles produced with urea as the fuel was also investigated. X-ray diffraction analysis revealed that the ZnO nanocrystalline particles were successfully synthesized by combustion and the crystallite size was different depending on the fuel. The surface morphology showed a dramatic change as the fuel changed in the synthesis process. The chemical states of the synthesized ZnO powders were investigated using X-ray photoelectron spectroscopy, which allowed an assessment of the Zn and O related defect concentrations. The optical bandgap varied from 3.12 to 3.14 eV for different fuels and it decreased to 3.10 eV in the fuel rich case for urea. The maximum defect level photoluminescence emission was observed for the ZnO powder synthesized using urea as the fuel, for the stoichiometric fuel mix. All products exhibited similar antibacterial effects; however they had a greater effect on Staphylococcus aureus compared to Escherichia coli .
机译：通过使用硝酸锌六水合物作为源（氧化剂）材料和尿素的燃烧方法合成纳米级ZnO粉末，以及甘氨酸或柠檬酸一水合物作为燃料。还研究了相对燃料对尿素产生的ZnO颗粒特性的氧化比的影响。 X射线衍射分析显示通过燃烧成功合成ZnO纳米晶体颗粒，并且晶粒尺寸根据燃料而不同。随着合成过程中的燃料改变，表面形态显示出剧烈变化。使用X射线光电子体光谱研究合成的ZnO粉末的化学质子，其允许评估Zn和O相关缺陷浓度。对于不同的燃料，光学带隙不同于3.12至3.14 eV，并且在尿素的燃料案例中降低至3.10eV。对于使用尿素作为燃料合成的ZnO粉末，观察到最大缺陷水平光致发光排放，用于化学计量燃料混合物。所有产品表现出类似的抗菌效果;然而，与大肠杆菌相比，它们对金黄色葡萄球菌具有更大的影响。

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