Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N-Doped Hierarchical Structure for Visible-Light Harvesting.

ABSTRACT: Regularly spaced TiO₂ nanotubes were prepared by anodizing a titanium substrate in triethylene glycol electrolyte at elevated temperature. In comparison to conventional TiO₂ nanotubes, spaced nanotubes possess an adjustable spacing between the individual nanotubes; this allows for controlled buildup of a hierarchical nanoparticle-on-nanotube structure. Here, we use this principle for layer-by-layer decoration of the tubes with TiO₂ nanoparticles. The hierarchical structure after N doping and NH₃ treatment at 450 °C shows a significant enhancement of visible-light absorption, although it only carries a low doping concentration of nitrogen. For optimized N-doped and particle-decorated spaced TiO₂ nanotubes, a considerable improvement in

SUBMITTER: Nguyen NT 

PROVIDER: S-EPMC5792828 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature