Oxygen vacancies induced band gap narrowing for efficient visible-light response in carbon-doped TiO₂.

ABSTRACT: The band gap of rutile TiO₂ has been narrowed, via the formation of oxygen vacancies (OVs) during heat treatment in carbon powder (cHT) with embedding TiO₂ coatings. The narrowed band gap efficiently improves the visible light response of TiO₂ coatings, to further enhance the visible-light-driven photocatalytic activity. The change in OVs during cHT has been studied by manipulation of cHT temperature and time. The effect of OVs on the band structure of nonstoichiometric TiO_2-x has been further calculated by first-principles calculations. With raising the temperature, SEM images show that the nano-size fiber-like structure forms on the surface of TiO₂ coatings, and the amount of the fiber-like structure significantly increases and their

SUBMITTER: Guan S 

PROVIDER: S-EPMC10465500 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature