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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 different Gd doping amount of TiO 2 nano-powders were prepared by sol-gel method and calcination at 500 ℃, and the corresponding TiO 2 nanotubes were prepared by microwave hydrothermal synthesis using the precursor as the precursor. The samples were characterized by scanning electron microscopy (FESEM), field emission transmission electron microscopy (TEM), X-ray diffraction (XRD) and fluorescence spectroscopy (FS). The effects of different Gd doping on the morphologies of TiO 2 nanopowders and nanotubes, Crystallinity and photoluminescence properties. The results showed that the particle size of pure TiO_2 nanopowders was about 15 nm. With the increase of Gd content, the particle size of TiO_2 nanopowders decreased after calcination. When the Gd content was 2%, the particle size of TiO_2 nanopowders was reduced to about 10 nm . Pure and doped Gd TiO 2 nanotubes are open at both ends, the hollow, the tube diameter of about 8 nm, a length of 100 ~ 500 nm, indicating Gd doping content on the morphology of TiO 2 nanotubes Big. XRD analysis showed that the crystallinity of TiO 2 nanotubes is generally lower than the crystallinity of the nanopowders, while proper Gd doping makes the TiO 2 nanotubes maintain a certain degree of crystallinity. In addition, the doping amount of Gd also affects the FS signal intensity of TiO 2 nanopowders and nanotubes. With the increase of Gd doping amount, the FS signal intensity of TiO 2 nanotubes first increases and then decreases. When the Gd doping amount is 0.5% and 0.2%, the FS signal intensity of TiO 2 nanotubes reaches the maximum value.