研究目的

To examine the influence of anodization voltage on the formation mechanism and structural properties of TiO2 nanotubes with a nanograss structure.

研究成果

TiO2 nanotubes with nanograss structures were successfully synthesized, with morphology and properties highly dependent on anodization voltage. Lower voltages (20 and 40 V) promote nanograss formation via a vertical splitting mechanism, leading to higher specific surface area and improved charge separation. Higher voltage (60 V) reduces nanograss, thickens tube walls, and introduces rutile phase, extending optical absorption into the visible region. The n-type semiconductor nature is confirmed, with donor density increasing up to 40 V and flat band potential becoming less negative, indicating reduced recombination rates. These findings suggest potential for enhanced performance in optoelectronic applications such as solar cells and photocatalysis.

研究不足

The study is limited to specific anodization voltages (20, 40, 60 V) and a fixed anodization time of 3 hours in an ethylene glycol-based electrolyte. The formation mechanism of nanograss is not fully understood and may be influenced by electrolyte composition and anodization conditions not explored here. The use of organic electrolytes with high viscosity might affect diffusion rates and morphology. Annealing at 500°C may introduce impurities or affect material properties. The research does not address long-term stability or scalability for industrial applications.