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Highly Defective Dark Nano Titanium Dioxide: Preparation via Pulsed Laser Ablation and Application

机译：高度缺陷的深色纳米二氧化钛：通过脉冲激光烧蚀制备及其应用

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The development of methods to synthesize and study the properties of dark titania is of the utmost interest due to prospects for its use, primarily in photocatalysis when excited by visible light. In this work, the dark titania powder was prepared by pulsed laser ablation (Nd:YAG laser, 1064 nm, 7 ns) in water and dried in air. To study the changes occurring in the material, the thermal treatment was applied. The structure, composition, and properties of the obtained powders were studied using transmission electron microscopy, low-temperature N adsorption/desorption, X-ray diffraction, thermogravimetry/differential scanning calorimetry, X-ray photoelectron, Raman and UV-vis spectroscopies, and photoluminescence methods. The processes occurring in the initial material upon heating were studied. The electronic structure of the semiconductor materials was investigated, and the nature of the defects providing the visible light absorption was revealed. The photocatalytic and antibacterial activities of the materials obtained were also studied. Dark titania obtained via laser ablation in liquid was found to exhibit catalytic activity in the phenol photodegradation process under visible light (>420 nm) and showed antibacterial activity against and bacteriostatic effect towards .
机译：由于其用途的前景，主要是在可见光激发下的光催化中，开发合成和研究暗二氧化钛性质的方法引起了极大的兴趣。在这项工作中，通过在水中进行脉冲激光烧蚀（Nd：YAG激光，1064 nm，7 ns）制备深色的二氧化钛粉末，然后在空气中干燥。为了研究材料中发生的变化，应用了热处理。使用透射电子显微镜，低温氮吸附/解吸，X射线衍射，热重/差示扫描量热法，X射线光电子，拉曼和紫外可见光谱研究了所得粉末的结构，组成和性能。光致发光方法。研究了初始材料在加热时发生的过程。研究了半导体材料的电子结构，并揭示了提供可见光吸收的缺陷的性质。还研究了所得材料的光催化和抗菌活性。发现通过激光烧蚀在液体中获得的深色二氧化钛在可见光（> 420 nm）下的苯酚光降解过程中显示出催化活性，并显示出对的抗菌活性和抑菌作用。

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