Strontium titanate (SrTiO₃), a cubic perovskite semiconductor with a band gap of approximately 3.2 eV, has emerged as a promising photocatalyst in the degradation of organic dyes and water splitting due to its outstanding thermal stability and photostability, excellent photocatalytic activity, and good structural stability.

By subjecting one-dimensional rutile TiO₂ nanorod arrays as the structure-directing scaffold as well as the TiO₂ source to two consecutive hydrothermal reactions, densely aligned SrTiO₃-modified rutile TiO₂ heterojunction photocatalysts have been crafted. Such one-dimensional perovskite-decorated semiconductor nanoarrays exhibited enhanced photocatalytic performance. The group responsible for developing these arrays believe they represent a promising material for potential use in solar energy utilizations, including photocatalytic production of hydrocarbon fuels, water splitting and solar cells.