钆掺杂TiO_2纳米管的制备及光致发光性能研究  

Synthesis and Photoluminescence of Gd-Doped TiO_2 Nanotubes

作　　者：薛寒松[1] 顾铭[1] 邢志辉[1] 饶劲松[1] 潘复生[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045

出　　处：《稀有金属》2015年第12期1065-1070,共6页Chinese Journal of Rare Metals

基　　金：重庆市自然科学基金项目(CSTC;2011BB4096);中央高校基本科研业务费科研专项项目(CDJZR12130044)资助

摘　　要：采用溶胶-凝胶法及500℃煅烧工艺制备了纯的和不同Gd掺杂量的TiO_2纳米粉,并以其为前驱物,通过微波水热合成法制备了相应的TiO_2纳米管,利用场发射扫描电镜（FESEM）,场发射透射电镜（FETEM）,X射线衍射（XRD）和荧光光谱（FS）仪等对样品进行表征,考察不同Gd的掺杂量对TiO_2纳米粉及纳米管形貌、结晶度和光致发光性能的影响。结果表明,纯的TiO_2纳米粉为15 nm左右,随着Gd掺杂量的提高,煅烧后TiO_2纳米粉粒径降低;当Gd含量为2%时,TiO_2纳米粉粒径减小到10 nm左右。纯的和掺杂Gd的TiO_2纳米管形貌均为两端开口,内中空,管的直径为8 nm左右,长度为100~500 nm,说明Gd掺杂含量对TiO_2纳米管的形貌影响不大。XRD分析表明,TiO_2纳米管的结晶度普遍低于纳米粉的结晶度,而适当Gd元素掺杂使TiO_2纳米管能保持一定的结晶度。另外,Gd掺杂量也影响TiO_2纳米粉以及纳米管的FS信号强度。随着Gd掺杂量的增加,TiO_2纳米管的FS信号强度有先增加后降低的变化趋势,当Gd掺杂量为0.5%和0.2%时,TiO_2纳米管的FS信号强度达到最大值。Pure and Gd-doped TiO2 nanopowders were prepared by a sol-gel process and 500 ℃ heat treatment, which were used as precursor subsequently. The corresponding TiO2 nanotubes were synthesized by hydrothermal method under microwave irradiation and then were characterized by field emission scanning electron microscopy （ FESEM ） , field emission transmission electron microscope （FETEM） , X-ray diffraction （XRD） and fluorescence spectrum （FS）. The effects of Gd content on morphology, crystallinity and photolumineseence of TiO2 nanopowders and nanotubes were investigated. The results showed that the diameter of TiO2 nanopowders de- creased with the increase of Gd dopant content, and the diameter decreased to about 10 nm when Gd dopant increased to 2%. Pure and Gd-doped TiO： nanotubes were both 8 nm in diameter and 100 -500 nm in length with open ends and hollow inside. The Gd content had few influences on the morphology of TiO2 nanotubes. The XRD results showed that the crystallinity of TiO2 nanotubes was generally less than that of TiO2 nanopowders, but Gd dopant could maintain crystallinity of TiO2 nanotubes an appropriate content. Moreover, the effects of Gd content on FS intensity for TiO2 nanopowders and nanotubes were discovered. The results showed that FS intensity of TiO2 nanotubes firstly increased and then decreased with the increase of Gd content. The maximum of FS intensity was reached when the Gd contents were 0. 2% and 0.5%.

关 键 词：TiO_2 纳米管 GD掺杂 光致发光 

分 类 号：O643[理学—物理化学]