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双稀土金属掺杂二氧化钛纳米管阵列的制备及其光电催化性能

发表时间:2017-07-13  浏览量:172  下载量:16
全部作者: 尹云超,薛鹏,万俊,刘恩周,胡晓云,樊君
作者单位: 西北大学化工学院; 西北大学物理学院
摘 要: 通过两步阳极氧化法分别制备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)及稀土元素Gd和Tm共掺杂TiO2纳米管阵列(Gd/Tm-TiO2 NTs)。表征所制备样品的形貌、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-可见光吸收特性,这归因于稀土元素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,这表明其光生载流子的复合率较低。同时,相比于TiO2 NTs和Gd/Ce-TiO2 NTs,Gd/Tm-TiO2 NTs表现出最高的光电催化性能,这是由于Gd和Tm共掺杂TiO2 NTs形成的杂质能级协同作用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: 化学工程其他学科;TiO2 NTs;共掺杂;杂质能级;阳极氧化法
Title: Fabrication of two tombarthite co-doped TiO2 nanotube arrays and photoelectrocatalytic performance
Author: YIN Yunchao, XUE Peng, WAN Jun, LIU Enzhou, HU Xiaoyun, FAN Jun
Organization: School of Chemical Engineering, Northwest University; School of Physics, Northwest University
Abstract: TiO2 nanotube arrays (TiO2 NTs), Gd/Ce and Gd/Tm co-doped highly ordered 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 samples were characterized. Compared with un-doped TiO2 NTs, Gd/Ce-TiO2 NTs and Gd/Tm-TiO2 NTs exhibited excellent visible light absorption capability which is caused by the formation of impurity energy states near the band edges. And the Gd/Tm-TiO2 NTs exhibited the higher current density than that of the un-doped TiO2 NTs and Gd/Ce-TiO2 NTs. Besides, the photoluminescence (PL) intensity of TiO2 NTs and Gd/Ce-TiO2 NTs was higher than that of Gd/Tm-TiO2 NTs, revealing a decrease in charge carrier recombination of Gd/Tm-TiO2 NTs, which is ascribed to the impurity energy states acting as the trapping sites for the photo-generated charges to reduce the recombination process. The photoelectrocatalytic performances 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 due to the synergy effect of impurity energy states between the enhanced light absorption and the increased charger-separation efficiency.
Key words: other subjects of chemical engineering; TiO2 NTs; co-doped; impurity energy states; anodization method
发表期数: 2017年7月第13期
引用格式: 尹云超,薛鹏,万俊,等. 双稀土金属掺杂二氧化钛纳米管阵列的制备及其光电催化性能[J]. 中国科技论文在线精品论文,2017,10(13):1482-1487.
 
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