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首页> 美国卫生研究院文献>Scientific Reports >FeOx-TiO2 Film with Different Microstructures Leading to Femtosecond Transients with Different Properties: Biological Implications under Visible Light
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FeOx-TiO2 Film with Different Microstructures Leading to Femtosecond Transients with Different Properties: Biological Implications under Visible Light

机译：具有不同微结构的FeOx-TiO2薄膜导致具有不同特性的飞秒瞬态：可见光下的生物学意义

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This study presents the first report addressing the effect of FeOx-TiO2 films microstructure on the transients detected by fast spectroscopy related to the long-range bacterial inactivation performance. The different fast kinetic femtosecond transient spectroscopy is reported for each FeOx+TiO2 microstructure. The lifetime of the short transient-species and the oxidative intermediate radicals generated under light were identified. Co-sputtered FeOx-TiO2 on polyethylene films presenting random distribution for both oxides were compared with sequentially sputtered FeOx/TiO2 films made up only by FeOx in the topmost layers. The ratio FeOx:TiO2 was optimized to attain the highest photo-conversion. By X-ray fluorescence, the Fe:Ti ration was found to be ~1.4 in the film bulk and by XPS-etching a ratio of 4:1 was found on the photocatalyst top-most layers. For co-sputtered FeOx-TiO2-PE films, the FeOx-TiO2 heterojunction led to electron injection from the FeOx to lower-lying TiO2 trapping states. The film optical properties, particle size, roughness, hydrophobic-hydrophilic shift and temporal evolution of the transient redox states were characterized in detail. Films with different microstructure led to different antibacterial activity. This suggests that the FeOx-TiO2-PE microstructure and not the position of the potential energy level of the semiconductors FeOx and TiO2 control the charge transfer under light irradiation.
机译：这项研究提出了第一个针对FeOx-TiO2薄膜微结构对快速光谱法检测到的与远距离细菌灭活性能有关的瞬变的影响的报告。对于每个FeOx + TiO2微观结构，均报告了不同的快速动力学飞秒瞬态光谱。确定了短瞬态物种的寿命和在光下产生的氧化中间自由基。将在两种氧化物上呈现随机分布的聚乙烯薄膜上共溅射的FeOx-TiO2与仅由顶层的FeOx组成的顺序溅射的FeOx / TiO2薄膜进行了比较。优化FeOx：TiO2的比例以获得最高的光转化率。通过X射线荧光，发现薄膜主体中的Fe：Ti比例约为1.4，而通过XPS蚀刻，在光催化剂最顶层的比例为4：1。对于共溅射FeOx-TiO2-PE膜，FeOx-TiO2异质结导致电子从FeOx注入到较低的TiO2俘获态。详细描述了膜的光学性质，粒径，粗糙度，疏水-亲水位移和瞬时氧化还原态的时间演化。具有不同微观结构的薄膜导致不同的抗菌活性。这表明FeOx-TiO2-PE的微观结构而不是半导体FeOx和TiO2的势能级的位置控制着光照射下的电荷转移。

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