Environmental Futures Centre and Griffith School of Environment, Gold Coast Campus, Griffith University, QLD 4222, Australia.
ACS Appl Mater Interfaces. 2011 Apr;3(4):1352-8. doi: 10.1021/am200152b. Epub 2011 Apr 6.
Self-organized, freestanding TiO(2) nanotube arrays with ridged structures have been fabricated using a one-step anodic oxidation method. Their structural, photocatalytic, and field-emission (FE) properties have systematically been investigated. The as-synthesized nanostructures have been characterized using XRD, Raman spectroscopy, SEM, and HRTEM. The experimental results show that after an annealing process, the starting amorphous nanotubes have been turned into anatase phase structures, and the tube walls have been decorated with nanoparticles, different from the original ridged nanotubes. Furthermore, the anatase phase nanotubes have demonstrated better photocatalytic properties than their amorphous counterparts, which is caused by the larger surface area and improved crystallinity. With respect to FE properties, the as-grown nanotubes have the lower turn-on field E(to) and the higher field enhancement factor β compared to the annealed nanotubes. The relationship between E(to), β, and the tube arrangements and morphologies has also been discussed.
采用一步阳极氧化法制备了具有脊结构的自组装、独立的 TiO2 纳米管阵列。系统研究了它们的结构、光催化和场发射（FE）性能。使用 XRD、拉曼光谱、SEM 和 HRTEM 对合成的纳米结构进行了表征。实验结果表明，经过退火处理后，起始的无定形纳米管已转变为锐钛矿相结构，并且管壁上装饰有不同于原始脊纳米管的纳米颗粒。此外，与无定形纳米管相比，锐钛矿相纳米管具有更好的光催化性能，这是由于其更大的表面积和提高的结晶度。就 FE 性能而言，与退火后的纳米管相比，生长的纳米管具有较低的开启场 E(to)和更高的场增强因子 β。还讨论了 E(to)、β 与管排列和形态之间的关系。
