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首页> 外文期刊>Applied Surface Science >Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation
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Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation

机译：等离子体电解氧化形成的TiO2：Eu3 +涂层的结构，光致发光和光催化性能

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In this paper, we used plasma electrolytic oxidation (PEO) of titanium in water solution containing 10 g/L Na3PO4 center dot 12H(2)O + 2 g/L Eu2O3 powder for preparation of TiO2:Eu3+ coatings. The surfaces of obtained coatings exhibit a typical PEO porous structure. The energy dispersive X-ray spectroscopy analysis showed that the coatings are mainly composed of Ti, O, P, and Eu; it is observed that Eu content in the coatings increases with PEO time. The X-ray diffraction analysis indicated that the coatings are crystallized and composed of anatase and rutile TiO2 phases, with anatase being the dominant one. X-ray photoelectron spectroscopy revealed that Ti 2p spin-orbit components of TiO2:Eu3+ coatings are shifted towards higher binding energy, with respect to pure TiO2 coatings, suggesting that Eu3+ ions are incorporated into TiO2 lattice. Diffuse reflectance spectroscopy showed that TiO2:Eu3+ coatings exhibit evident red shift with respect to the pure TiO2 coatings. Photoluminescence (PL) emission spectra of TiO2:Eu3+ coatings are characterized by sharp emission bands in orange-red region ascribed to f-f transitions of Eu3+ ions from excited level D-5(0) to lower levels F-7(J) (J=0, 1, 2, 3, and 4). The excitation PL spectra of TiO2:Eu3+ coatings can be divided into two regions: the broad band region from 250 nm to 350 nm associated with charge transfer state of Eu3+ and the series of sharp peaks in the range from 350 nm to 550 rim corresponding to direct excitation of the Eu3+ ions. It is observed that the intensity of peaks in excitation and emission PL spectra increases with the concentration of Eu3+, but the peak positions remain practically unchanged. The ratio of PL emission for electric and magnetic dipole transitions indicates highly asymmetric environment around Eu3+ ions. The photocatalytic activity (PA) of TiO2:Eu3+ coatings is evaluated by measuring the photodegradation of methyl orange under simulated sunlight conditions. It is shown that PEO time, i.e., the amount of Eu3+ incorporated into coatings is an important factor affecting PA; TiO2:Eu3+ coating formed after 1 min of PEO time showed the highest PA. (C) 2016 Elsevier B.V. All rights reserved.
机译：在本文中，我们使用含有10 g / L Na3PO4中心点12H（2）O + 2 g / L Eu2O3粉末的水溶液中钛的等离子体电解氧化（PEO）来制备TiO2：Eu3 +涂层。所得涂层的表面表现出典型的PEO多孔结构。 X射线能谱分析表明，该涂层主要由Ti，O，P和Eu组成。观察到涂层中的Eu含量随PEO时间的增加而增加。 X射线衍射分析表明，涂层是结晶的，由锐钛矿相和金红石型TiO2相组成，其中锐钛矿为主导。 X射线光电子能谱显示，相对于纯TiO2涂层，TiO2：Eu3 +涂层的Ti 2p自旋轨道组分朝着更高的结合能移动，这表明Eu3 +离子被掺入了TiO2晶格中。漫反射光谱表明，TiO2：Eu3 +涂层相对于纯TiO2涂层表现出明显的红移。 TiO2：Eu3 +涂层的光致发光（PL）发射光谱的特征是橙红色区域中的尖锐发射带，归因于Eu3 +离子从激发能级D-5（0）到较低能级F-7（J）的ff跃迁（J = 0、1、2、3和4）。 TiO2：Eu3 +涂层的激发PL光谱可分为两个区域：与Eu3 +的电荷转移状态相关的250 nm至350 nm的宽带区域，以及对应于Eu3 +的350 nm至550 rim范围内的一系列尖峰。直接激发Eu3 +离子。观察到，激发和发射PL光谱中的峰强度随Eu3 +的浓度而增加，但峰位置实际上保持不变。电和磁偶极跃迁的PL发射比表明Eu3 +离子周围的高度不对称环境。 TiO2：Eu3 +涂层的光催化活性（PA）通过在模拟阳光条件下测量甲基橙的光降解来评估。结果表明，PEO时间，即涂料中Eu3 +的掺入量是影响PA的重要因素。 PEO时间1分钟后形成的TiO2：Eu3 +涂层显示出最高的PA。 （C）2016 Elsevier B.V.保留所有权利。

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