TiO_2纳米管电极金属离子掺杂的表征

Characterization of Metal Ion Doped TiO_2 Nanotubes Electrode

采用浸渍法对TiO2纳米管电极进行Zn2+、Fe3+、Cu2+离子的掺杂改性,并进行了各种性能表征.扫描电镜(SEM)及X射线衍射光谱(XRD)结果表明,金属离子掺杂后的TiO2纳米管电极依然保持了良好的表面形态及锐钛矿晶型,纳米管的直径为60—100 nm,其晶面主要为101面;可见紫外漫反射光谱(DRS)分析表明,进行掺杂的TiO2纳米管电极的光学性质有不同程度的改变,Zn2+、Fe3+和Cu2+掺杂的TiO2纳米管电极的禁带宽度分别为3.37 eV3、.14 eV、2.86 eV.这表明掺Cu2+的TiO2纳米管电极的吸收边带发生了明显的红移.

The Zn2＋,Fe3＋ and Cu2＋ are doped on TiO2 nanotubes electrode using dipping method in this study.The properties of doped TiO2 nanotubes electrode are characterized using some advanced analytic methods.It is found from the images of scanning electron microscope（SEM） and patterns of X-ray diffraction（XRD） that the doped TiO2 nanotubes electrode,whose nanotubes diameter are range from 60 to 100 nm,still remain the original morphology and anatase crystal structure with 101 crystal face.However,the results of UV-Vis diffusion reflectance spectroscopy（DRS） indicate that the initial absorption edges for the three doped TiO2 nanotubes electrodes shift at different degree.Energy band gaps of Zn2＋,Fe3＋ and Cu2＋ doped TiO2 nanotubes are 3.37 eV,3.14 eV and 2.86 eV,respectively.This indicates that the absorption edge of the TiO2 nanotubes doped with Cu2＋ is red-shift.