摘要： 通过职称论文发表期刊两步阳极氧化法分别制备了TiO2纳米管阵列（TiO2 NTs）、稀土元素Gd和Ce共掺杂TiO2 纳米管阵列（Gd/Ce-TiO2 NTs）以及稀土元素Gd和Tm共掺杂TiO2 纳米管阵列（Gd/Tm-TiO2 NTs）。表征了所制备样品的形貌、结晶性和光吸收能力等。相比于未掺杂的TiO2 NTs，Gd/Ce-TiO2 NTs和Gd/Tm-TiO2 NTs表现出更好的紫外-可见光吸收，这归因于稀土元素的掺杂形成了杂质能级。Gd/Tm-TiO2 NTs表现出更高的光电流密度。另外，相比于TiO2 NTs和Gd/Ce-TiO2 NTs，Gd/Tm-TiO2 NTs显示出更低的荧光强度，这表明了其光生载流子的复合率最低。同时，相比于TiO2 NTs和Gd/Ce-TiO2 NTs，Gd/Tm-TiO2 NTs也表现出最高的光电催化性能。这归因于由于Gd和Tm的共掺杂TiO2 NTs形成了杂质能级协同使样品的光吸收增强,同时使光生载流子的分离率提高。
关键词： TiO2 NTs；共掺杂；杂质能级；阳极氧化法

YIN Yunchao^1,， XUE Peng^1,， WAN Jun^1,， LIU Enzhou^1,， HU Xiaoyun^2,， FAN Jun^1,*

（  1、School of Chemical Engineering, Northwest University, Xi'an 710069, PR China；       2、School of physics, Northwest University, Xi'an 710069, PR China；  ）

Abstract： Highly ordered TiO2 nanotube arrays(TiO2 NTs), Gd/Ce and Gd/Tm co-doped TiO2 nanotube arrays (Gd/Ce-TiO2 NTs and Gd/Tm-TiO2 NTs) were synthesized through a two-step anodization method. The morphology, crystallinity and light absorption capability of as-obtained samples were distinguished based on various characterizations. Gd/Ce-TiO2 NTs and Gd/Tm-TiO2 NTs exhibited excellent light absorption which is caused by the formation of impurity energy states near both the band edges. And the Gd/Tm-TiO2 NTs exhibited the highest current density than that of the pure TiO2 NTs and Gd/Ce-TiO2 NTs. Besides, the PL intensity of Gd/Tm-TiO2 NTs was lowest than that of TiO2 NTs and Gd/Ce-TiO2 NTs, revealing a decrease in charge carrier recombination. The photoelectrocatalytic activities of the Gd/Tm-TiO2 NTs have been significantly enhanced compared to that of un-doped TiO2 NTs and Gd/Ce-TiO2 NTs, which is ascribed to the impurity energy states acting as the trapping sites for both the photo-generated charges to reduce the recombination process.
Keywords： TiO2 NTs; co-doped; impurity energy states; anodization method