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ZnO quantum dots-decorated ZnO nanowires for the enhancement of antibacterial and photocatalytic performances

机译：ZnO量子点修饰的ZnO纳米线可增强抗菌和光催化性能

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摘要

We demonstrate highly antibacterial activities for killing off Staphylococcus aureus and Escherichia coli using ZnO nanowires decorated with ZnO quantum dots (so-called ZnO QDs/NWs) under visible-light irradiation and dark conditions. The average size of the ZnO QDs is in the range of 3-5 nm; these were uniformly dispersed on the ZnO nanowires' surface to form the ZnO QDs/NWs. A significant blue-shift effect was observed using photoluminescence (PL) spectra. The size of the ZnO QDs is strongly dependent on the material's synthesis time. The ZnO QDs/NWs exhibited an excellent photocatalytic activity under visible-light irradiation. The ZnO QDs' active sites (i.e. the O-H bond and Zn2+) accelerate the photogenerated-carrier migration from the QDs to the NWs. As a consequence, the electrons reacted with the dissolved oxygen to form oxygen ions and produced hydroperoxyl radicals to enhance photocatalytic activity. The antibacterial activities (as indicated by R-factor-inhibiting activity) of the ZnO QDs/NWs for killing off Staphylococcus aureus and Escherichia coli is around 4.9 and 5.5 under visible-light irradiation and dark conditions, respectively. The hydroxyl radicals served as an efficient oxidized agent for decomposing the organic dye and microorganism species. The antibacterial activities of the ZnO QDs/NWs in the dark may be attributed to the Zn2+ ions that were released from the ZnO QDs and infused into the microbial solution against the growth of bacteria thus disrupting the microorganism. The highly antibacterial and photocatalytic activity of the ZnO QDs/NWs can be well implanted on a screen window, thus offering a promising solution to inhibit the spread of germs under visible-light and dark conditions.
机译：我们展示了在可见光和黑暗条件下使用装饰有ZnO量子点的ZnO纳米线（所谓的ZnO QDs / NWs）杀死金黄色葡萄球菌和大肠杆菌的高度抗菌活性。 ZnO QD的平均尺寸在3-5 nm范围内;它们均匀地分散在ZnO纳米线的表面上，形成ZnO QD / NW。使用光致发光（PL）光谱观察到明显的蓝移效应。 ZnO QD的大小在很大程度上取决于材料的合成时间。 ZnO QDs / NWs在可见光照射下表现出优异的光催化活性。 ZnO QD的活性位点（即O-H键和Zn2 +）加速了光生载流子从QD向NW的迁移。结果，电子与溶解的氧反应形成氧离子并产生氢过氧自由基以增强光催化活性。 ZnO QDs / NWs在可见光照射和黑暗条件下杀死金黄色葡萄球菌和大肠杆菌的抗菌活性（如R因子抑制活性所示）分别约为4.9和5.5。羟基自由基是分解有机染料和微生物物种的有效氧化剂。 ZnO QDs / NWs在黑暗中的抗菌活性可能归因于从ZnO QDs释放出来并注入到微生物溶液中的Zn2 +离子，以抵抗细菌的生长，从而破坏了微生物。 ZnO QDs / NWs的高度抗菌和光催化活性可以很好地植入到玻璃窗上，从而提供了一种在可见光和黑暗条件下抑制细菌传播的有前途的解决方案。

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