ZnO纳米棒为模板的TiO_2纳米管制备及其场发射性能研究

Fabrication and Field Emission Behavior of TiO_2 Nanotubes Array Grown with Template of ZnO Nanorod

以水热法生长ZnO纳米棒阵列为模板,利用液相沉积法成功制备了TiO2纳米管阵列,并系统研究了液相沉积液浓度和沉积时间对ZnO纳米棒的溶解情况,以及所制备TiO2纳米管阵列的场发射性能。实验结果表明:硼酸浓度越大、沉积时间越长,对ZnO纳米棒的溶解作用越明显,因而越不利于TiO2纳米管的制备。利用该种方法制备的TiO2纳米管长径比和致密性可通过ZnO纳米棒的水热生长条件来控制,本实验制备的TiO2纳米管具有优异的场发射性能,其开启场强为4.60 V/μm,场增强因子为10239。

The TiO2 nanotubes arrays were synthesized, on substrate of ITO-coated glass, by liquid phase deposition with the hydrothermally grown ZnO nanorods as template. The impacts of the synthesis conditions, particularly the concentration of reagent and deposition time, on microstructures of TiO2 nanotubes and corrosion of ZnO nanorods were evaluated. The TiO2 nanotubes were characterized with scanning electron microscopy and energy dispersive spectroscopy. The resuhs show that a higher H3BO3 concentration and a longer deposition time negatively affect the TiO2 nanotube growth because of faster corrosion of ZnO nanorods, and that the compactness and aspect ratio of TiO2 nanotube can be controlled by properly adjusting the hydrothermally growth conditions of ZnO nano-rods. When it comes to field emission behavior,TiO2 nanotubes outperform ZnO nano-rods. The on-set field and field enhancement factor of the TiO2 nanotubes were found to be 4.60 V/μn and 10239, respectively.